Correction status:Uncorrected
Teacher's comments:
盒子模型与定位
2018年8月17号 天气:小雨转阴
1. 编程实现盒模型的基本要素: 内容,内外边距与边框,并背诵padding与margin的简写规则
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>盒子模型</title> </head> <style> .box{ width:200px; height: 200px; background-color: lavender; /*padding: padding:代表内边距 padding只有两个参数的写法:padding:10px,20px(10px代表上下,20px代表左右) padding只有三个参数的写法:padding:10px,20px,30px(10px代表上,20px代表左右,30px代表下) padding一个参数:padding:10px(代表上下左右) */ padding: 50px; /*border: border:代表边款 统一边框:border:10px solid skyblue;(分别代表宽度、线的样式、颜色) 某一方向;border-left:10px solid skyblue;(分别代表宽度、线的样式、颜色) */ border-bottom-width: 10px; border-bottom-color: green; border-bottom-style: solid; border-right: 20px dashed gold; border-left: 30px dotted orange; border-top: 20px double wheat; margin-left: 200px; margin-top: 20px; } </style> <body> <div class="box"><img src="https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1534509106049&di=7ec23f84bea571626c11ee137928daad&imgtype=0&src=http%3A%2F%2Fpic35.photophoto.cn%2F20150607%2F1190120700924364_b.jpg" title="七夕节快乐" width="200" ></div> </body> </html>
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2. 编程实现最常用的四种元素对齐方案:
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>四种对齐方式</title> <style> .box1{ width: 200px; line-height: 200px; background-color: burlywood; text-align: center; margin-bottomm: 20px; } .box2{ width: 200px; height: 200px; background-color: lightcoral; text-align: center; display: table-cell ; margin-right: 20px; vertical-align: middle; margin-top: 30px; } .box3{ width: 200px; height: 200px; background-color: lightpink; display: table-cell ; vertical-align: middle; } .child{ width: 100px; height: 100px; background-color: aqua; margin:auto; text-align: center; } .box4{ width: 200px; height: 200px; background-color: cyan; display: table-cell ; vertical-align: bottom; } ul li{ display: inline; } </style> </head> <body> <div class="box1">我是单行文本居中</div> <br> <hr> <div class="box2"> <span>我是多行内连文本</span><br> <span>学好PHP,</span><br> <span>走遍天下,</span><br> <span>我都不怕!</span> </div> <div class="box3"> <div class="child">我是子元素是块元素</div> </div> <br> <hr> <div class="box4"> <span>我是子元素不定宽</span> <ul> <li><a href="">1</a></li> <li><a href="">2</a></li> <li><a href="">3</a></li> <li><a href="">4</a></li> <li><a href="">5</a></li> </ul> </div> </body> </html>
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3. 编程实现用五个色块制作一个十字架(相对定位和绝对定位任选一种实现即可)
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>定位</title> <style> #father{ position: relative; width: 300px; height: 300px; /*background-color: lightgray;*/ } .box1{ width: 100px; height: 100px; background-color: lightseagreen; text-align: center; line-height: 100px; position: absolute; left: 100px; } .box2{ width: 100px; height: 100px; background-color: orange; text-align: center; line-height: 100px; position: absolute; top: 100px; } .box3{ width: 100px; height: 100px; background-color: cyan; text-align: center; line-height: 100px; position:absolute; left: 100px; top: 200px; } .box4{ width: 100px; height: 100px; background-color: lightcoral; text-align: center; line-height: 100px; position: absolute; top: 100px; left: 100px; } .box5{ width: 100px; height: 100px; background-color: lightgreen; text-align: center; line-height: 100px; position: absolute; top: 100px; left: 200px; } </style> </head> <body> <div id="father"> <div class="box1">1</div> <div class="box2">2</div> <div class="box3">3</div> <div class="box4">4</div> <div class="box5">5</div> </div> </body> </html>
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总结:
通过这堂课,以前学到的盒子定位理解的更清楚了,但觉得自己完成作业的进度太慢了,既然自己以前学过,应该更容易上手才对,从中发现代码应该多敲多练才对。。在这次我自己也遇到很弱智的问题就是:既然把div设为了单元格,那么它的magin属性就不生效了,而自己在哪里竟就纠结好久,实在不应该。加油吧.......