Sass+require implements sidebar

1. Rendering (below) and techniques used

Use sass to implement the style of the fixed sidebar on the right side of the page, and use require.js to implement the function of returning to the top

2, sass

I won’t go into details about the specific introduction of sass. You can refer to the introduction of sass official website. Let’s talk about the two compilation methods of sass;

a.koala compilation

koala is a desktop program that supports instant compilation of less, sass, and coffeescript. Download address: http://koala-app.com/

Koala can directly compile scss without typing commands, and can monitor scss. For specific usage methods, see: http://www.w3cplus.com/preprocessor/sass-gui-tool-koala.html

Note: This compilation method is more convenient. Just download koalo, create a new *.scss file, drag it into the workspace and click "Finish", and you can monitor the files added to the workspace without clicking compile every time;

b. Compile with sass command (recommended)

This method requires the following steps:

(1) Because sass depends on the ruby ​​environment, make sure ruby ​​is installed before installing sass. Official website download: ruby;

When installing, please check the Add Ruby executables to your PATH option and add environment variables, otherwise when you use the compilation software in the future, you will be prompted that the ruby ​​environment cannot be found

       

(2) After installing ruby, in the start menu, find the ruby ​​we just installed and open Start Command Prompt with Ruby

       

            Then enter directly in the command line:

<span style="color: #008080;"> gem install sass</span>

Press Enter to install. If the installation is unsuccessful, you can directly download the "sass installation file" in the picture at http://www.w3cplus.com/sassguide/install.html

     

After downloading, place it in the gems folder under the ruby ​​installation directory (as shown below)

After the installation is complete, you can enter the command in the command line:

* View the command behavior of the sass version

sass -v

* You can also run the help command line to view the commands you need

sass -h

      * Single file conversion command

  sass style.scss style.css

*Single file monitoring command

sass --watch style.scss:style.css

* Folder monitoring command

sass --watch sassFileDirectory:cssFileDirectory

3. Basics of using require.js

Create a new directory with the following structure

There are index.html, jquery-1.11.3js, main.js, and require.js under the directory toolbar. Just download require.js and jquery-1.11.3.js from their respective official websites.

index.html is as follows:

<span style="color: #008080;"> 1</span> <span style="color: #0000ff;"><!</span><span style="color: #ff00ff;">doctype html</span><span style="color: #0000ff;">></span>
<span style="color: #008080;"> 2</span> <span style="color: #0000ff;"><</span><span style="color: #800000;">html</span><span style="color: #0000ff;">></span>
<span style="color: #008080;"> 3</span>     <span style="color: #0000ff;"><</span><span style="color: #800000;">head</span><span style="color: #0000ff;">></span>
<span style="color: #008080;"> 4</span>         <span style="color: #0000ff;"><</span><span style="color: #800000;">title</span><span style="color: #0000ff;">></span>requirejs<span style="color: #0000ff;"></</span><span style="color: #800000;">title</span><span style="color: #0000ff;">></span>
<span style="color: #008080;"> 5</span>         <span style="color: #0000ff;"><</span><span style="color: #800000;">meta </span><span style="color: #ff0000;">charset</span><span style="color: #0000ff;">="utf-8"</span><span style="color: #0000ff;">></span>
<span style="color: #008080;"> 6</span>         <span style="color: #0000ff;"><</span><span style="color: #800000;">script </span><span style="color: #ff0000;">data-main</span><span style="color: #0000ff;">="js/main"</span><span style="color: #ff0000;"> src</span><span style="color: #0000ff;">="js/require.js"</span><span style="color: #0000ff;">></</span><span style="color: #800000;">script</span><span style="color: #0000ff;">></span>
<span style="color: #008080;"> 7</span>     <span style="color: #0000ff;"></</span><span style="color: #800000;">head</span><span style="color: #0000ff;">></span>
<span style="color: #008080;"> 8</span>     <span style="color: #0000ff;"><</span><span style="color: #800000;">body</span><span style="color: #0000ff;">></span>
<span style="color: #008080;"> 9</span>      
<span style="color: #008080;">10</span>     <span style="color: #0000ff;"></</span><span style="color: #800000;">body</span><span style="color: #0000ff;">></span>
<span style="color: #008080;">11</span> <span style="color: #0000ff;"></</span><span style="color: #800000;">html</span><span style="color: #0000ff;">></span>
<span style="color: #008080;">12</span> 　　

Using requirejs is very simple, you just need to introduce it through the script tag in the head (in fact, except require.js, other file modules no longer use script tags to introduce it).

Careful students will find that there is an additional custom attribute on the script tag: data-main="main", and the main on the right side of the equal sign refers to main.js. Of course you can use any name.

This main refers to the main module or entry module, such as the main function main in c or java.

main.js is as follows

<span style="color: #008080;">1</span> <span style="color: #000000;">require.config({
</span><span style="color: #008080;">2</span> <span style="color: #000000;">    paths: {
</span><span style="color: #008080;">3</span>         jquery: 'jquery-1.11.3'<span style="color: #008000;">//</span><span style="color: #008000;">此处用不用添加.js后缀，否则执行的时候会报错</span>
<span style="color: #008080;">4</span> <span style="color: #000000;">    }
</span><span style="color: #008080;">5</span> <span style="color: #000000;">});
</span><span style="color: #008080;">6</span>  
<span style="color: #008080;">7</span> require(['jquery'], <span style="color: #0000ff;">function</span><span style="color: #000000;">($) {
</span><span style="color: #008080;">8</span> <span style="color: #000000;">    alert($().jquery);
</span><span style="color: #008080;">9</span> });

     main.js中就两个函数调用require.config和require。

     require.config用来配置一些参数，它将影响到requirejs库的一些行为。

     require.config的参数是一个JS对象，常用的配置有baseUrl，paths等。

     这里配置了paths参数，使用模块名“jquery”，其实际文件路径jquery-1.11.3.js（后缀.js可以省略）。

 

     注：有些同学习惯用npm 来下载相关文件，在这里有一点需要注意的是：

     下载require.js的命令是：

npm install requirejs

     而不是( 注 意 )

npm install require.js   

 

四、功能实现

      项目目录结构如下：

      

      在命令行输入命令如下，对scss文件夹进行监听并将scss中的scss文件编译到css文件夹中；

     

1、html部分：

<span style="color: #008080;">  1</span> <span style="color: #0000ff;"><!</span><span style="color: #ff00ff;">DOCTYPE html</span><span style="color: #0000ff;">></span>
<span style="color: #008080;">  2</span> <span style="color: #0000ff;"><</span><span style="color: #800000;">html </span><span style="color: #ff0000;">lang</span><span style="color: #0000ff;">="en"</span><span style="color: #0000ff;">></span>
<span style="color: #008080;">  3</span> <span style="color: #0000ff;"><</span><span style="color: #800000;">head</span><span style="color: #0000ff;">></span>
<span style="color: #008080;">  4</span>     <span style="color: #0000ff;"><</span><span style="color: #800000;">meta </span><span style="color: #ff0000;">charset</span><span style="color: #0000ff;">="UTF-8"</span><span style="color: #0000ff;">></span>
<span style="color: #008080;">  5</span>     <span style="color: #0000ff;"><</span><span style="color: #800000;">title</span><span style="color: #0000ff;">></span>toolbar<span style="color: #0000ff;"></</span><span style="color: #800000;">title</span><span style="color: #0000ff;">></span>
<span style="color: #008080;">  6</span>     <span style="color: #0000ff;"><</span><span style="color: #800000;">link </span><span style="color: #ff0000;">rel</span><span style="color: #0000ff;">="stylesheet"</span><span style="color: #ff0000;"> href</span><span style="color: #0000ff;">="css/index.css"</span><span style="color: #0000ff;">></span>
<span style="color: #008080;">  7</span> 
<span style="color: #008080;">  8</span> <span style="color: #0000ff;"></</span><span style="color: #800000;">head</span><span style="color: #0000ff;">></span>
<span style="color: #008080;">  9</span> <span style="color: #0000ff;"><</span><span style="color: #800000;">body</span><span style="color: #0000ff;">></span>
<span style="color: #008080;"> 10</span> <span style="color: #0000ff;"><</span><span style="color: #800000;">div </span><span style="color: #ff0000;">class</span><span style="color: #0000ff;">="toolbar"</span><span style="color: #0000ff;">></span>
<span style="color: #008080;"> 11</span>     <span style="color: #0000ff;"><</span><span style="color: #800000;">a </span><span style="color: #ff0000;">href</span><span style="color: #0000ff;">="javascript:;"</span><span style="color: #ff0000;"> class</span><span style="color: #0000ff;">="toolbar-item toolbar-item-weixin"</span><span style="color: #0000ff;">></span>
<span style="color: #008080;"> 12</span>         <span style="color: #0000ff;"><</span><span style="color: #800000;">span </span><span style="color: #ff0000;">class</span><span style="color: #0000ff;">="toolbar-layout"</span><span style="color: #0000ff;">></</span><span style="color: #800000;">span</span><span style="color: #0000ff;">></span>
<span style="color: #008080;"> 13</span>     <span style="color: #0000ff;"></</span><span style="color: #800000;">a</span><span style="color: #0000ff;">></span>
<span style="color: #008080;"> 14</span>     <span style="color: #0000ff;"><</span><span style="color: #800000;">a </span><span style="color: #ff0000;">href</span><span style="color: #0000ff;">="javascript:;"</span><span style="color: #ff0000;">  class</span><span style="color: #0000ff;">="toolbar-item toolbar-item-feedback"</span><span style="color: #0000ff;">></</span><span style="color: #800000;">a</span><span style="color: #0000ff;">></span>
<span style="color: #008080;"> 15</span>     <span style="color: #0000ff;"><</span><span style="color: #800000;">a </span><span style="color: #ff0000;">href</span><span style="color: #0000ff;">="javascript:;"</span><span style="color: #ff0000;">  class</span><span style="color: #0000ff;">="toolbar-item toolbar-item-app"</span><span style="color: #0000ff;">></span>
<span style="color: #008080;"> 16</span>         <span style="color: #0000ff;"><</span><span style="color: #800000;">span </span><span style="color: #ff0000;">class</span><span style="color: #0000ff;">="toolbar-layout"</span><span style="color: #0000ff;">></</span><span style="color: #800000;">span</span><span style="color: #0000ff;">></span>
<span style="color: #008080;"> 17</span>     <span style="color: #0000ff;"></</span><span style="color: #800000;">a</span><span style="color: #0000ff;">></span>
<span style="color: #008080;"> 18</span>     <span style="color: #0000ff;"><</span><span style="color: #800000;">a </span><span style="color: #ff0000;">id</span><span style="color: #0000ff;">="backTop"</span><span style="color: #ff0000;"> href</span><span style="color: #0000ff;">="javascript:;"</span><span style="color: #ff0000;">  class</span><span style="color: #0000ff;">="toolbar-item toolbar-item-top"</span><span style="color: #0000ff;">></span>
<span style="color: #008080;"> 19</span>         <span style="color: #0000ff;"><</span><span style="color: #800000;">span </span><span style="color: #ff0000;">class</span><span style="color: #0000ff;">="toolbar-btn"</span><span style="color: #0000ff;">></</span><span style="color: #800000;">span</span><span style="color: #0000ff;">></span>
<span style="color: #008080;"> 20</span>     <span style="color: #0000ff;"></</span><span style="color: #800000;">a</span><span style="color: #0000ff;">></span>
<span style="color: #008080;"> 21</span> <span style="color: #0000ff;"></</span><span style="color: #800000;">div</span><span style="color: #0000ff;">></span>
<span style="color: #008080;"> 22</span> <span style="color: #008000;"><!--</span><span style="color: #008000;">下面部分是为了使页面出现滚动条，方便测试</span><span style="color: #008000;">--></span>
<span style="color: #008080;"> 23</span> <span style="color: #0000ff;"><</span><span style="color: #800000;">p</span><span style="color: #0000ff;">></span>测试<span style="color: #0000ff;"></</span><span style="color: #800000;">p</span><span style="color: #0000ff;">></span>
<span style="color: #008080;"> 24</span> <span style="color: #0000ff;"><</span><span style="color: #800000;">p</span><span style="color: #0000ff;">></span>测试<span style="color: #0000ff;"></</span><span style="color: #800000;">p</span><span style="color: #0000ff;">></span>
<span style="color: #008080;"> 25</span> <span style="color: #0000ff;"><</span><span style="color: #800000;">p</span><span style="color: #0000ff;">></span>测试<span style="color: #0000ff;"></</span><span style="color: #800000;">p</span><span style="color: #0000ff;">></span>
<span style="color: #008080;"> 26</span> <span style="color: #0000ff;"><</span><span style="color: #800000;">p</span><span style="color: #0000ff;">></span>测试<span style="color: #0000ff;"></</span><span style="color: #800000;">p</span><span style="color: #0000ff;">></span>
<span style="color: #008080;">       ...</span>
<span style="color: #008080;">119</span> <span style="color: #0000ff;"><</span><span style="color: #800000;">p</span><span style="color: #0000ff;">></span>测试<span style="color: #0000ff;"></</span><span style="color: #800000;">p</span><span style="color: #0000ff;">></span>
<span style="color: #008080;">120</span> <span style="color: #0000ff;"><</span><span style="color: #800000;">p</span><span style="color: #0000ff;">></span>测试<span style="color: #0000ff;"></</span><span style="color: #800000;">p</span><span style="color: #0000ff;">></span>
<span style="color: #008080;">121</span> <span style="color: #0000ff;"><</span><span style="color: #800000;">p</span><span style="color: #0000ff;">></span>测试<span style="color: #0000ff;"></</span><span style="color: #800000;">p</span><span style="color: #0000ff;">></span>
<span style="color: #008080;">122</span> <span style="color: #0000ff;"><</span><span style="color: #800000;">p</span><span style="color: #0000ff;">></span>测试<span style="color: #0000ff;"></</span><span style="color: #800000;">p</span><span style="color: #0000ff;">></span>
<span style="color: #008080;">123</span> <span style="color: #0000ff;"><</span><span style="color: #800000;">script </span><span style="color: #ff0000;">src</span><span style="color: #0000ff;">="js/require.js"</span><span style="color: #ff0000;"> data-main</span><span style="color: #0000ff;">="js/main"</span><span style="color: #0000ff;">></</span><span style="color: #800000;">script</span><span style="color: #0000ff;">></span>
<span style="color: #008080;">124</span> <span style="color: #0000ff;"></</span><span style="color: #800000;">body</span><span style="color: #0000ff;">></span>
<span style="color: #008080;">125</span> <span style="color: #0000ff;"></</span><span style="color: #800000;">html</span><span style="color: #0000ff;">></span>

 

 2、css & scss部分：   

   scss文件夹中的：

         (1) _mixin.scss: scss可以像js一样，将一些公共的样式封装成函数，便于重复利用

<span style="color: #008080;"> 1</span> <span style="color: #800000;">@mixin opacity($opacity)</span>{
<span style="color: #008080;"> 2</span> <span style="color: #ff0000;">  opacity</span>:<span style="color: #0000ff;"> $opacity</span>;
<span style="color: #008080;"> 3</span> <span style="color: #ff0000;">  filter</span>:<span style="color: #0000ff;"> opacity($opacity * 100)</span>;
<span style="color: #008080;"> 4</span> }
<span style="color: #008080;"> 5</span> <span style="color: #800000;">@mixin transform-origin ($transform-origin)</span>{
<span style="color: #008080;"> 6</span> <span style="color: #ff0000;">  transform-origin</span>:<span style="color: #0000ff;"> $transform-origin</span>;
<span style="color: #008080;"> 7</span> <span style="color: #ff0000;">  -webkit-transform-origin</span>:<span style="color: #0000ff;"> $transform-origin</span>;
<span style="color: #008080;"> 8</span> <span style="color: #ff0000;">  -o-transform-origin</span>:<span style="color: #0000ff;"> $transform-origin</span>;
<span style="color: #008080;"> 9</span> <span style="color: #ff0000;">  -ms-transform-origin</span>:<span style="color: #0000ff;"> $transform-origin</span>;
<span style="color: #008080;">10</span> <span style="color: #ff0000;">  -moz-transform-origin</span>:<span style="color: #0000ff;"> $transform-origin</span>;
<span style="color: #008080;">11</span> }
<span style="color: #008080;">12</span> <span style="color: #800000;">@mixin scale($scale)</span>{
<span style="color: #008080;">13</span> <span style="color: #ff0000;">  transform</span>:<span style="color: #0000ff;"> scale($scale)</span>;
<span style="color: #008080;">14</span> <span style="color: #ff0000;">  -webkit-transform</span>:<span style="color: #0000ff;"> scale($scale)</span>;
<span style="color: #008080;">15</span> <span style="color: #ff0000;">  -o-transform</span>:<span style="color: #0000ff;"> scale($scale)</span>;
<span style="color: #008080;">16</span> <span style="color: #ff0000;">  -ms-transform</span>:<span style="color: #0000ff;"> scale($scale)</span>;
<span style="color: #008080;">17</span> <span style="color: #ff0000;">  -moz-transform</span>:<span style="color: #0000ff;"> scale($scale)</span>;
<span style="color: #008080;">18</span> }
<span style="color: #008080;">19</span> <span style="color: #800000;">@mixin transition($transition)</span>{
<span style="color: #008080;">20</span> <span style="color: #ff0000;">  transition</span>:<span style="color: #0000ff;"> $transition</span>;
<span style="color: #008080;">21</span> <span style="color: #ff0000;">  -webkit-transition</span>:<span style="color: #0000ff;"> $transition</span>;
<span style="color: #008080;">22</span> <span style="color: #ff0000;">  -o-transition</span>:<span style="color: #0000ff;"> $transition</span>;
<span style="color: #008080;">23</span> <span style="color: #ff0000;">  -ms-transition</span>:<span style="color: #0000ff;"> $transition</span>;
<span style="color: #008080;">24</span> <span style="color: #ff0000;">  -moz-transition</span>:<span style="color: #0000ff;"> $transition</span>;
<span style="color: #008080;">25</span> }

     (2) toobar.scss : 该模块中的自有样式（只在自个模块中使用的）

     

<span style="color: #008080;"> 1</span> <span style="color: #800000;">@import "mixin";
</span><span style="color: #008080;"> 2</span> <span style="color: #800000;">@mixin toolbar-item($pos,$hoverPos)</span>{
<span style="color: #008080;"> 3</span> <span style="color: #ff0000;">  background-position</span>:<span style="color: #0000ff;"> 0 $pos</span>;
<span style="color: #008080;"> 4</span> <span style="color: #ff0000;">  &</span>:<span style="color: #0000ff;">hover {
</span><span style="color: #008080;"> 5</span> <span style="color: #0000ff;">    background-position: 0 $hoverPos</span>;
<span style="color: #008080;"> 6</span>   }
<span style="color: #008080;"> 7</span> 
<span style="color: #008080;"> 8</span> <span style="color: #800000;">}
</span><span style="color: #008080;"> 9</span> <span style="color: #800000;">$toolbar-size: 52px;
</span><span style="color: #008080;">10</span> 
<span style="color: #008080;">11</span> <span style="color: #800000;">.toolbar-item, .toolbar-layout </span>{
<span style="color: #008080;">12</span> <span style="color: #ff0000;">  background-image</span>:<span style="color: #0000ff;"> url(../img/toolbar.png)</span>;
<span style="color: #008080;">13</span> <span style="color: #ff0000;">  background-repeat</span>:<span style="color: #0000ff;"> no-repeat</span>;
<span style="color: #008080;">14</span> }
<span style="color: #008080;">15</span> <span style="color: #800000;">.toolbar </span>{
<span style="color: #008080;">16</span> <span style="color: #ff0000;">  position</span>:<span style="color: #0000ff;"> fixed</span>;
<span style="color: #008080;">17</span> <span style="color: #ff0000;">  left</span>:<span style="color: #0000ff;"> 50%</span>;
<span style="color: #008080;">18</span> <span style="color: #ff0000;">  bottom</span>:<span style="color: #0000ff;"> 100px</span>;
<span style="color: #008080;">19</span> <span style="color: #ff0000;">  margin-left</span>:<span style="color: #0000ff;"> -$toolbar-size / 2</span>;
<span style="color: #008080;">20</span> }
<span style="color: #008080;">21</span> <span style="color: #800000;">.toolbar-item </span>{
<span style="color: #008080;">22</span> <span style="color: #ff0000;">  position</span>:<span style="color: #0000ff;"> relative</span>;
<span style="color: #008080;">23</span> <span style="color: #ff0000;">  display</span>:<span style="color: #0000ff;"> block</span>;
<span style="color: #008080;">24</span> <span style="color: #ff0000;">  width</span>:<span style="color: #0000ff;"> $toolbar-size</span>;
<span style="color: #008080;">25</span> <span style="color: #ff0000;">  height</span>:<span style="color: #0000ff;"> $toolbar-size</span>;
<span style="color: #008080;">26</span> <span style="color: #ff0000;">  margin-top</span>:<span style="color: #0000ff;"> 1px</span>;
<span style="color: #008080;">27</span> 
<span style="color: #008080;">28</span> <span style="color: #ff0000;">  @include transition(background-position 1s);
</span><span style="color: #008080;">29</span> <span style="color: #ff0000;">  &</span>:<span style="color: #0000ff;">hover {
</span><span style="color: #008080;">30</span> <span style="color: #0000ff;">    .toolbar-layout {
</span><span style="color: #008080;">31</span> <span style="color: #0000ff;">      @include opacity(1)</span>;
<span style="color: #008080;">32</span> <span style="color: #ff0000;">      @include scale(1);
</span><span style="color: #008080;">33</span> <span style="color: #ff0000;">      @include transition(all 1s);
</span><span style="color: #008080;">34</span>     }
<span style="color: #008080;">35</span> <span style="color: #800000;">  }
</span><span style="color: #008080;">36</span> 
<span style="color: #008080;">37</span> <span style="color: #800000;">}
</span><span style="color: #008080;">38</span> <span style="color: #800000;">.toolbar-layout </span>{
<span style="color: #008080;">39</span> <span style="color: #ff0000;">  position</span>:<span style="color: #0000ff;"> absolute</span>;
<span style="color: #008080;">40</span> <span style="color: #ff0000;">  right</span>:<span style="color: #0000ff;"> $toolbar-size - 5</span>;
<span style="color: #008080;">41</span> <span style="color: #ff0000;">  bottom</span>:<span style="color: #0000ff;"> 0</span>;
<span style="color: #008080;">42</span> <span style="color: #ff0000;">  width</span>:<span style="color: #0000ff;"> 172px</span>;
<span style="color: #008080;">43</span> <span style="color: #ff0000;">  @include transform-origin(95% 95%);
</span><span style="color: #008080;">44</span> <span style="color: #ff0000;">  @include opacity(0);
</span><span style="color: #008080;">45</span> <span style="color: #ff0000;">  @include scale(0.01);
</span><span style="color: #008080;">46</span> <span style="color: #ff0000;">  @include transition(all 1s);
</span><span style="color: #008080;">47</span> 
<span style="color: #008080;">48</span> }
<span style="color: #008080;">49</span> <span style="color: #800000;">.toolbar-item-weixin </span>{
<span style="color: #008080;">50</span> <span style="color: #ff0000;">  @include toolbar-item(-798px, -860px);
</span><span style="color: #008080;">51</span> 
<span style="color: #008080;">52</span> <span style="color: #ff0000;">  .toolbar-layout {
</span><span style="color: #008080;">53</span> <span style="color: #ff0000;">    height</span>:<span style="color: #0000ff;"> 212px</span>;
<span style="color: #008080;">54</span> <span style="color: #ff0000;">    background-position</span>:<span style="color: #0000ff;"> 0 0</span>;
<span style="color: #008080;">55</span>   }
<span style="color: #008080;">56</span> <span style="color: #800000;">}
</span><span style="color: #008080;">57</span> 
<span style="color: #008080;">58</span> <span style="color: #800000;">.toolbar-item-feedback </span>{
<span style="color: #008080;">59</span> <span style="color: #ff0000;">  @include toolbar-item(-426px,-488px);
</span><span style="color: #008080;">60</span> 
<span style="color: #008080;">61</span> }
<span style="color: #008080;">62</span> <span style="color: #800000;">.toolbar-item-app </span>{
<span style="color: #008080;">63</span> <span style="color: #ff0000;">  @include toolbar-item(-550px,-612px);
</span><span style="color: #008080;">64</span> 
<span style="color: #008080;">65</span> <span style="color: #ff0000;">  .toolbar-layout {
</span><span style="color: #008080;">66</span> <span style="color: #ff0000;">    height</span>:<span style="color: #0000ff;"> 194px</span>;
<span style="color: #008080;">67</span> <span style="color: #ff0000;">    background-position</span>:<span style="color: #0000ff;"> 0 -222</span>;
<span style="color: #008080;">68</span>   }
<span style="color: #008080;">69</span> <span style="color: #800000;">}
</span><span style="color: #008080;">70</span> <span style="color: #800000;">.toolbar-item-top </span>{
<span style="color: #008080;">71</span> <span style="color: #ff0000;">  @include toolbar-item(-674px,-736px);
</span><span style="color: #008080;">72</span>   
<span style="color: #008080;">73</span> }

    (3) index.scss: 该项目引入的样式文件，编译后为index.css，在html中只引入index.css，便于文件管理

    

<span style="color: #008080;">1</span> <span style="color: #800000;">@import "toolbar";</span>

  3、js部分：

   （1）jquery-1.11.3.js和require.js是该项目的依赖，可从各自官网下载，也可以通过npm下载，html中只引入require.js即可

   （2）main.js是项目的入口文件

<span style="color: #000000;">require.config({
  paths:{
    jquery:</span>"./jquery-1.11.3"<span style="color: #000000;">
  }

});

require([</span>'jquery',"backtop"],<span style="color: #0000ff;">function</span><span style="color: #000000;"> ($,backTop) {
  </span><span style="color: #0000ff;">var</span> backTop = <span style="color: #0000ff;">new</span> backTop.BackTop($("#backTop"<span style="color: #000000;">),{//构造函数实例化
    mode:</span>"move"<span style="color: #000000;">,
    dest:</span>0<span style="color: #000000;">,
    speed:</span>500<span style="color: #000000;">
  });
});</span>

  （3）backtop.js:

<span style="color: #008080;"> 1</span> define(["jquery","scrollTo"],<span style="color: #0000ff;">function</span><span style="color: #000000;">($,scrollTo){
</span><span style="color: #008080;"> 2</span> 
<span style="color: #008080;"> 3</span>   <span style="color: #0000ff;">function</span><span style="color: #000000;"> BackTop(el,opts){
</span><span style="color: #008080;"> 4</span> 
<span style="color: #008080;"> 5</span>     <span style="color: #0000ff;">this</span>.opts =<span style="color: #000000;"> $.extend({},BackTop.defaults,opts);
</span><span style="color: #008080;"> 6</span>     <span style="color: #0000ff;">this</span>.$el =<span style="color: #000000;">$(el);
</span><span style="color: #008080;"> 7</span> 
<span style="color: #008080;"> 8</span>     <span style="color: #0000ff;">this</span>.scroll = <span style="color: #0000ff;">new</span><span style="color: #000000;"> scrollTo.ScrollTo({
</span><span style="color: #008080;"> 9</span>       dest: 0<span style="color: #000000;">,
</span><span style="color: #008080;">10</span>       speed:<span style="color: #0000ff;">this</span><span style="color: #000000;">.opts.speed
</span><span style="color: #008080;">11</span> <span style="color: #000000;">    });
</span><span style="color: #008080;">12</span> 
<span style="color: #008080;">13</span>     <span style="color: #0000ff;">if</span>(<span style="color: #0000ff;">this</span>.opts.mode === "move"<span style="color: #000000;">){
</span><span style="color: #008080;">14</span>       <span style="color: #0000ff;">this</span>.$el.on("click", $.proxy(<span style="color: #0000ff;">this</span>._move,<span style="color: #0000ff;">this</span>));<span style="color: #008000;">//</span><span style="color: #008000;">改变this指向</span>
<span style="color: #008080;">15</span> 
<span style="color: #008080;">16</span>     }<span style="color: #0000ff;">else</span><span style="color: #000000;"> {
</span><span style="color: #008080;">17</span>       <span style="color: #0000ff;">this</span>.$el.on("click", $.proxy(<span style="color: #0000ff;">this</span>._go,<span style="color: #0000ff;">this</span>));<span style="color: #008000;">//</span><span style="color: #008000;">改变this指向</span>
<span style="color: #008080;">18</span> 
<span style="color: #008080;">19</span> <span style="color: #000000;">    }
</span><span style="color: #008080;">20</span> 
<span style="color: #008080;">21</span>     <span style="color: #0000ff;">this</span><span style="color: #000000;">._checkPosition();
</span><span style="color: #008080;">22</span>     $(window).on("scroll",$.proxy(<span style="color: #0000ff;">this</span>._checkPosition,<span style="color: #0000ff;">this</span><span style="color: #000000;">));
</span><span style="color: #008080;">23</span> 
<span style="color: #008080;">24</span> <span style="color: #000000;">  };
</span><span style="color: #008080;">25</span> 
<span style="color: #008080;">26</span> 
<span style="color: #008080;">27</span> 
<span style="color: #008080;">28</span>   BackTop.defaults =<span style="color: #000000;"> {
</span><span style="color: #008080;">29</span>     mode:'move',<span style="color: #008000;">//</span><span style="color: #008000;">返回顶部的方式，直接返回还是动画返回</span>
<span style="color: #008080;">30</span>     pos:$(window).height(),<span style="color: #008000;">//</span><span style="color: #008000;">返回顶部按钮显示隐藏的初始值</span>
<span style="color: #008080;">31</span>     speed:800
<span style="color: #008080;">32</span> <span style="color: #000000;">  }
</span><span style="color: #008080;">33</span> 
<span style="color: #008080;">34</span>   BackTop.prototype._move = <span style="color: #0000ff;">function</span><span style="color: #000000;">(){
</span><span style="color: #008080;">35</span>     <span style="color: #0000ff;">this</span><span style="color: #000000;">.scroll.move();
</span><span style="color: #008080;">36</span> <span style="color: #000000;">  }
</span><span style="color: #008080;">37</span>   BackTop.prototype._go = <span style="color: #0000ff;">function</span><span style="color: #000000;">(){
</span><span style="color: #008080;">38</span>     <span style="color: #0000ff;">this</span><span style="color: #000000;">.scroll.go();
</span><span style="color: #008080;">39</span> <span style="color: #000000;">  }
</span><span style="color: #008080;">40</span>   BackTop.prototype._checkPosition = <span style="color: #0000ff;">function</span><span style="color: #000000;">(){
</span><span style="color: #008080;">41</span> 
<span style="color: #008080;">42</span>     <span style="color: #0000ff;">var</span> $el = <span style="color: #0000ff;">this</span><span style="color: #000000;">.$el;
</span><span style="color: #008080;">43</span> 
<span style="color: #008080;">44</span>     <span style="color: #0000ff;">if</span>($(window).scrollTop() > <span style="color: #0000ff;">this</span><span style="color: #000000;">.opts.pos){
</span><span style="color: #008080;">45</span> 
<span style="color: #008080;">46</span> <span style="color: #000000;">      $el.fadeIn();
</span><span style="color: #008080;">47</span>     }<span style="color: #0000ff;">else</span><span style="color: #000000;"> {
</span><span style="color: #008080;">48</span> <span style="color: #000000;">      $el.fadeOut();
</span><span style="color: #008080;">49</span> <span style="color: #000000;">    }
</span><span style="color: #008080;">50</span> <span style="color: #000000;">  };
</span><span style="color: #008080;">51</span> 
<span style="color: #008080;">52</span>   <span style="color: #0000ff;">return</span><span style="color: #000000;"> {BackTop:BackTop}
</span><span style="color: #008080;">53</span> 
<span style="color: #008080;">54</span> });

（4）scrollTo.js

<span style="color: #008080;"> 1</span> define(["jquery"],<span style="color: #0000ff;">function</span><span style="color: #000000;">($){
</span><span style="color: #008080;"> 2</span> 
<span style="color: #008080;"> 3</span>   <span style="color: #0000ff;">function</span><span style="color: #000000;"> ScrollTo(opts){
</span><span style="color: #008080;"> 4</span> 
<span style="color: #008080;"> 5</span>     <span style="color: #0000ff;">this</span>.opts =<span style="color: #000000;"> $.extend({},ScrollTo.defaults,opts);
</span><span style="color: #008080;"> 6</span> 
<span style="color: #008080;"> 7</span>     <span style="color: #0000ff;">this</span>.$el = $("html,body"<span style="color: #000000;">);
</span><span style="color: #008080;"> 8</span> 
<span style="color: #008080;"> 9</span> <span style="color: #000000;">  };
</span><span style="color: #008080;">10</span> 
<span style="color: #008080;">11</span>   ScrollTo.prototype.move = <span style="color: #0000ff;">function</span><span style="color: #000000;">(){
</span><span style="color: #008080;">12</span>     <span style="color: #0000ff;">var</span> opts = <span style="color: #0000ff;">this</span><span style="color: #000000;">.opts;
</span><span style="color: #008080;">13</span>     <span style="color: #0000ff;">var</span> dest =<span style="color: #000000;"> opts.dest;
</span><span style="color: #008080;">14</span>     <span style="color: #008000;">//</span><span style="color: #008000;">防止动画未结束多次执行动画</span>
<span style="color: #008080;">15</span>     <span style="color: #0000ff;">if</span>($(window).scrollTop() != dest){<span style="color: #008000;">//</span><span style="color: #008000;">判断是否到达目的地</span>
<span style="color: #008080;">16</span> 
<span style="color: #008080;">17</span>       <span style="color: #0000ff;">if</span>(!<span style="color: #0000ff;">this</span>.$el.is(":animated")){<span style="color: #008000;">//</span><span style="color: #008000;">判断是否在运动</span>
<span style="color: #008080;">18</span> 
<span style="color: #008080;">19</span>         <span style="color: #0000ff;">this</span><span style="color: #000000;">.$el.animate({
</span><span style="color: #008080;">20</span> <span style="color: #000000;">          scrollTop:dest
</span><span style="color: #008080;">21</span> <span style="color: #000000;">        },opts.speed);
</span><span style="color: #008080;">22</span> <span style="color: #000000;">      }
</span><span style="color: #008080;">23</span> <span style="color: #000000;">    }
</span><span style="color: #008080;">24</span> 
<span style="color: #008080;">25</span> <span style="color: #000000;">  };
</span><span style="color: #008080;">26</span>   ScrollTo.prototype.go = <span style="color: #0000ff;">function</span><span style="color: #000000;">(){
</span><span style="color: #008080;">27</span> 
<span style="color: #008080;">28</span>     <span style="color: #0000ff;">var</span> dest = <span style="color: #0000ff;">this</span><span style="color: #000000;">.opts.dest;
</span><span style="color: #008080;">29</span> 
<span style="color: #008080;">30</span>     <span style="color: #0000ff;">if</span>($(window).scrollTop() !=<span style="color: #000000;"> dest){
</span><span style="color: #008080;">31</span>       <span style="color: #0000ff;">this</span><span style="color: #000000;">.$el.scrollTop(dest);
</span><span style="color: #008080;">32</span> <span style="color: #000000;">    }
</span><span style="color: #008080;">33</span> 
<span style="color: #008080;">34</span> <span style="color: #000000;">  };
</span><span style="color: #008080;">35</span>   ScrollTo.defaults =<span style="color: #000000;"> {
</span><span style="color: #008080;">36</span>     dest: 0,<span style="color: #008000;">//</span><span style="color: #008000;">目的地</span>
<span style="color: #008080;">37</span>     speed:800<span style="color: #008000;">//</span><span style="color: #008000;">滚动速度</span>
<span style="color: #008080;">38</span> <span style="color: #000000;">  };
</span><span style="color: #008080;">39</span>   <span style="color: #0000ff;">return</span><span style="color: #000000;"> {
</span><span style="color: #008080;">40</span> <span style="color: #000000;">    ScrollTo:ScrollTo
</span><span style="color: #008080;">41</span> <span style="color: #000000;">  }
</span><span style="color: #008080;">42</span> });