Detailed explanation of jQuery timeline plug-in usage

这个时间轴是工作上用到的，自己写了一个， qq空间有时间轴的控件，百度文库也有时间轴的控件；

　　百度的时间轴大概是这样的：

　　用户点击对应的锚链接，那个三角会滚动，然后左侧的界面也会滚动；

　　实际的效果如下图，用户点击左侧的按钮或者右侧的input，滚动条都会主动滚动，这里有个小技巧就是用after和before伪类生成三角形，用户点击按钮的滚动效果直接用jq的animate方法：

<!--
//设置内容;
window.onWebMessage( '{"type":"setItems","data":{"items":[{"name":1111},{"name":2222}]}}' ) ;

//设置内容, 对应的item对象如果active为true为激活态;
window.onWebMessage( '{"type":"setItems","data":{"items":[{"name":1000},{"name":1111},{"name":2222},{"name":3333,"active":true}]}}' ) ;

//设置某个第n个位置的item;
window.onWebMessage('{"type":"setItem","data":[2,{ "name" : "add-item"}]}');

//激活第三个锚链接为选中态;
window.onWebMessage( '{"type":"active","data":2}' )

//获取目前的数据:
window.onWebMessage( '{"type":"getItem"}' );
-->

<html>
  <head>
    <meta charset="utf-8" />
    <script src="http://cdn.bootcss.com/jquery/2.1.4/jquery.js"></script>
  </head>
  <style>
    /*初始的reset样式*/
    *{
      margin:0;
      padding:0;
    }
    .time-line-wrap{
      position: relative;
      width: 400px;
      margin:0 auto;
    }
    ul{
      list-style: none;
    }
    body,html{
      height: 100%;
    }
    body{
      -webkit-user-select: none;
      -moz-user-select: none;
      -ms-user-select: none;
      user-select: none;
    }


    /*样式开始*/
    .scroll-time-line{
      height:100%;
      overflow: hidden;
    }
    .time-line-wrap{
      position: relative;
    }
    .time-line-ul{
      position: relative;
    }
    /**
    时间轴的轴用伪类实现;
    */
    .time-line-ul::before{
      display: block;
      position:absolute;
      content:"";
      height:100%;
      width:1;
      left:27px;
      top:0;
      background: #eee;
    }
    .time-line-ul li{
      padding:14px;
      position: relative;
    }
    .time-line-ul input {
      vertical-align: super;
      border-radius: 4px;
      border:1px solid #eee;
      padding:4px;
      line-height: 22px;
      margin-left:10px;
    }
    /**
    使用after和before伪类实现input前面的三角形;
    */
    .time-line-ul li::before{
      position: absolute;
      content: "";
      display: block;
      top: 21px;
      left: 40px;
      width: 0px;
      height: 0px;
      border: 10px solid rgba(0, 0, 0, 0);
      border-right: 10px solid #EEE;
    }
    .time-line-ul li::after{
      position: absolute;
      content: "";
      display: block;
      top: 21px;
      left: 41px;
      width: 0px;
      height: 0px;
      border: 10px solid rgba(0, 0, 0, 0);
      border-right: 10px solid #fff;
    }
    /**
    默认时间轴锚链接的样式
    */
    .time-line-icon{
      width: 26px;
      height: 28px;
      display: inline-block;
      background: url(http://images0.cnblogs.com/blog2015/497865/201507/131424386411828.png);
    }
    /**
    鼠标移动上来，或者锚链接有active时候的背景图样式
    */
    .time-line-icon.active,.time-line-icon:hover{
      background-position: 0px 28px;
    }
  </style>

  <!--模板，勿删!-->
  <script type="text/tempate" id="li-tpl">
    <% for(var i=0; i<items.length; i++ ) {%>
      <li class="li-<%=i%>">
        <a href="###" class="time-line-icon <% if(items[i].active){ %> <%="active"%> <%}%> "></a>
        <input type="text" value="<%=items[i].name%>"/>
      </li>
    <% } %>
  </script>

  <body>
    <!--
    滚动出现在这个div里面
    -->
    <div class="scroll-time-line">

      <!---
      时间轴相关的html结构
      -->
      <div class="time-line-wrap">
        <ul class="time-line-ul">
          <li>
            <a href="###" class="time-line-icon"></a> <input type="text" value="2015"/>
          </li>
          <li>
            <a href="###" class="time-line-icon"></a> <input type="text" value="2015"/>
          </li>
          <li>
            <a href="###" class="time-line-icon"></a> <input type="text" value="2015"/>
          </li>
          <li>
            <a href="###" class="time-line-icon"></a> <input type="text" value="2015"/>
          </li>
          <li>
            <a href="###" class="time-line-icon"></a> <input type="text" value="2015"/>
          </li>
          <li>
            <a href="###" class="time-line-icon"></a> <input type="text" value="2015"/>
          </li>
          <li>
            <a href="###" class="time-line-icon"></a> <input type="text" value="2015"/>
          </li>
          <li>
            <a href="###" class="time-line-icon"></a> <input type="text" value="2015"/>
          </li>
          <li>
            <a href="###" class="time-line-icon"></a> <input type="text" value="2015"/>
          </li>
          <li>
            <a href="###" class="time-line-icon"></a> <input type="text" value="2015"/>
          </li>
          <li>
            <a href="###" class="time-line-icon"></a> <input type="text" value="2015"/>
          </li>
          <li>
            <a href="###" class="time-line-icon"></a> <input type="text" value="2015"/>
          </li>
          <li>
            <a href="###" class="time-line-icon"></a> <input type="text" value="2015"/>
          </li>
          <li>
            <a href="###" class="time-line-icon"></a> <input type="text" value="2015"/>
          </li>
          <li>
            <a href="###" class="time-line-icon"></a> <input type="text" value="2015"/>
          </li>
          <li>
            <a href="###" class="time-line-icon"></a> <input type="text" value="2015"/>
          <li>
            <a href="###" class="time-line-icon"></a> <input type="text" value="2015"/>
          </li>
          <li>
            <a href="###" class="time-line-icon"></a> <input type="text" value="2015"/>
          </li>
          <li>
            <a href="###" class="time-line-icon"></a> <input type="text" value="2015"/>
          </li>
          <li>
            <a href="###" class="time-line-icon"></a> <input type="text" value="2015"/>
          </li>
          <li>
            <a href="###" class="time-line-icon"></a> <input type="text" value="2015"/>
          </li>
        </ul>
      </div>
      <!---
      时间轴相关的html结构结束
      -->
    </div>
    <script>
      //模板引擎的代码
      (function () {
        //underscore抄的模板引擎;
        var escaper = /\\|'|\r|\n|\t|\u2028|\u2029/g;

        var escapes = {
          "'":   "'",
          '\\':   '\\',
          '\r':   'r',
          '\n':   'n',
          '\t':   't',
          '\u2028': 'u2028',
          '\u2029': 'u2029'
        };

        $.templateSettings = {
          evaluate  : /<%([\s\S]+&#63;)%>/g,
          interpolate : /<%=([\s\S]+&#63;)%>/g,
          escape   : /<%-([\s\S]+&#63;)%>/g
        }
        $.template = function(text, data, settings) {
          var render;
          settings = $.extend({}, settings, $.templateSettings);

          // Combine delimiters into one regular expression via alternation.
          var matcher = new RegExp([
            (settings.escape || noMatch).source,
            (settings.interpolate || noMatch).source,
            (settings.evaluate || noMatch).source
          ].join('|') + '|$', 'g');

          // Compile the template source, escaping string literals appropriately.
          var index = 0;
          var source = "__p+='";
          text.replace(matcher, function(match, escape, interpolate, evaluate, offset) {
            source += text.slice(index, offset)
                .replace(escaper, function(match) { return '\\' + escapes[match]; });

            if (escape) {
              source += "'+\n((__t=(" + escape + "))==null&#63;'':_.escape(__t))+\n'";
            }
            if (interpolate) {
              source += "'+\n((__t=(" + interpolate + "))==null&#63;'':__t)+\n'";
            }
            if (evaluate) {
              source += "';\n" + evaluate + "\n__p+='";
            }
            index = offset + match.length;
            return match;
          });
          source += "';\n";

          // If a variable is not specified, place data values in local scope.
          if (!settings.variable) source = 'with(obj||{}){\n' + source + '}\n';

          source = "var __t,__p='',__j=Array.prototype.join," +
              "print=function(){__p+=__j.call(arguments,'');};\n" +
              source + "return __p;\n";

          try {
            render = new Function(settings.variable || 'obj', '_', source);
          } catch (e) {
            e.source = source;
            throw e;
          }

          if (data) return render(data, _);
          var template = function(data) {
            return render.call(this, data);
          };

          // Provide the compiled function source as a convenience for precompilation.
          template.source = 'function(' + (settings.variable || 'obj') + '){\n' + source + '}';

          return template;
        };
      })();

      (function( fn ) {

        $( fn.call( $ ,$) );

      })(function ($) {

        $.timeLineSetting = {
          offsetTop : 100
        };
        $.extend($.fn, {
          timeLine : function() {
            $.each(this, function() {

              var _this = this;

              $(this).delegate(".time-line-ul>li", "click", function( ev ) {

                $(".time-line-icon.active").removeClass("active");

                $(this).find(".time-line-icon").addClass("active");

                $(_this).animate({scrollTop: this.offsetTop - $.timeLineSetting.offsetTop},300);

                ev.preventDefault();

              });
            });
          }
        });
      });
      $(function() {
        var compile= $.template( $("#li-tpl").html() || "");

        //与客户端的交互事件;
        var orginalData = {};
        window.onWebMessage = function( msg ) {
          msg = JSON.parse(msg);
          switch( msg.type ) {
            case "setItems" :
              $(".time-line-ul").html( compile(msg.data) );
              //结构化复制;
              orginalData = JSON.parse(JSON.stringify(msg.data));
              break;

            case "setItem" :
              orginalData.items&&orginalData.items.splice(msg.data[0],0,msg.data[1]);
              $(".time-line-ul").html( compile(orginalData) );
              break;

            case "getItem" :
                alert(JSON.stringify( orginalData ));
              break;

            case "active" :
              $(".time-line-icon.active").removeClass("active");
              $(".time-line-ul>li").eq( msg.data).find(".time-line-icon").addClass("active")
              break;

          };

        };

        //启用插件;
        $(".scroll-time-line").timeLine();
      })
    </script>
  </body>
</html>

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　　模板用了underscore，tempate方法挂到了$下，作为$的工具方法（依赖于jQuery），模板的js代码直接放这里方便一些小项目直接用：

      //模板引擎的代码
      (function () {
        //underscore抄的模板引擎;
        var escaper = /\\|'|\r|\n|\t|\u2028|\u2029/g;

        var escapes = {
          "'":   "'",
          '\\':   '\\',
          '\r':   'r',
          '\n':   'n',
          '\t':   't',
          '\u2028': 'u2028',
          '\u2029': 'u2029'
        };

        $.templateSettings = {
          evaluate  : /<%([\s\S]+&#63;)%>/g,
          interpolate : /<%=([\s\S]+&#63;)%>/g,
          escape   : /<%-([\s\S]+&#63;)%>/g
        }
        $.template = function(text, data, settings) {
          var render;
          settings = $.extend({}, settings, $.templateSettings);

          // Combine delimiters into one regular expression via alternation.
          var matcher = new RegExp([
            (settings.escape || noMatch).source,
            (settings.interpolate || noMatch).source,
            (settings.evaluate || noMatch).source
          ].join('|') + '|$', 'g');

          // Compile the template source, escaping string literals appropriately.
          var index = 0;
          var source = "__p+='";
          text.replace(matcher, function(match, escape, interpolate, evaluate, offset) {
            source += text.slice(index, offset)
                .replace(escaper, function(match) { return '\\' + escapes[match]; });

            if (escape) {
              source += "'+\n((__t=(" + escape + "))==null&#63;'':_.escape(__t))+\n'";
            }
            if (interpolate) {
              source += "'+\n((__t=(" + interpolate + "))==null&#63;'':__t)+\n'";
            }
            if (evaluate) {
              source += "';\n" + evaluate + "\n__p+='";
            }
            index = offset + match.length;
            return match;
          });
          source += "';\n";

          // If a variable is not specified, place data values in local scope.
          if (!settings.variable) source = 'with(obj||{}){\n' + source + '}\n';

          source = "var __t,__p='',__j=Array.prototype.join," +
              "print=function(){__p+=__j.call(arguments,'');};\n" +
              source + "return __p;\n";

          try {
            render = new Function(settings.variable || 'obj', '_', source);
          } catch (e) {
            e.source = source;
            throw e;
          }

          if (data) return render(data, _);
          var template = function(data) {
            return render.call(this, data);
          };

          // Provide the compiled function source as a convenience for precompilation.
          template.source = 'function(' + (settings.variable || 'obj') + '){\n' + source + '}';

          return template;
        };
      })();

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　　模板的使用的DEMO如下, 也可以参考官方的文档：http://underscorejs.org/#template：

<html>
  <head>
    <body>
      <script src="http://cdn.bootcss.com/jquery/2.1.4/jquery.js"></script>
      <script>
      //模板引擎的代码
      (function () {
        //underscore抄的模板引擎;
        var escaper = /\\|'|\r|\n|\t|\u2028|\u2029/g;

        var escapes = {
          "'":   "'",
          '\\':   '\\',
          '\r':   'r',
          '\n':   'n',
          '\t':   't',
          '\u2028': 'u2028',
          '\u2029': 'u2029'
        };

        $.templateSettings = {
          evaluate  : /<%([\s\S]+&#63;)%>/g,
          interpolate : /<%=([\s\S]+&#63;)%>/g,
          escape   : /<%-([\s\S]+&#63;)%>/g
        }
        $.template = function(text, data, settings) {
          var render;
          settings = $.extend({}, settings, $.templateSettings);

          // Combine delimiters into one regular expression via alternation.
          var matcher = new RegExp([
            (settings.escape || noMatch).source,
            (settings.interpolate || noMatch).source,
            (settings.evaluate || noMatch).source
          ].join('|') + '|$', 'g');

          // Compile the template source, escaping string literals appropriately.
          var index = 0;
          var source = "__p+='";
          text.replace(matcher, function(match, escape, interpolate, evaluate, offset) {
            source += text.slice(index, offset)
                .replace(escaper, function(match) { return '\\' + escapes[match]; });

            if (escape) {
              source += "'+\n((__t=(" + escape + "))==null&#63;'':_.escape(__t))+\n'";
            }
            if (interpolate) {
              source += "'+\n((__t=(" + interpolate + "))==null&#63;'':__t)+\n'";
            }
            if (evaluate) {
              source += "';\n" + evaluate + "\n__p+='";
            }
            index = offset + match.length;
            return match;
          });
          source += "';\n";

          // If a variable is not specified, place data values in local scope.
          if (!settings.variable) source = 'with(obj||{}){\n' + source + '}\n';

          source = "var __t,__p='',__j=Array.prototype.join," +
              "print=function(){__p+=__j.call(arguments,'');};\n" +
              source + "return __p;\n";

          try {
            render = new Function(settings.variable || 'obj', '_', source);
          } catch (e) {
            e.source = source;
            throw e;
          }

          if (data) return render(data, _);
          var template = function(data) {
            return render.call(this, data);
          };

          // Provide the compiled function source as a convenience for precompilation.
          template.source = 'function(' + (settings.variable || 'obj') + '){\n' + source + '}';

          return template;
        };
      })();
      </script>
      <script>
      //会输出 <div>haahah</div>;
      console.log( $.template('<div><%=data%></div>')( {data:"haahah"} ) );
      </script>
    </body>
  </head>
</html>

Copy after login

　　修改了时间轴的样式，又为这个插件添加了拖拽的方法，代码一下变得好乱，顺便普及一下拖拽的事件， ondrop， ondragover，ondrag，如果要让元素可以拖拽, 就要为要拖拽的元素添加draggable="true", 元素可以拖拽以后，要为可以拖放到的的DIV或者其他块元素，绑定一个dragover方法，这个方法就做一件事， ev.preventDefault()，看代码撒：

运行下面代码

<!DOCTYPE HTML>
<html>
<head>
  <meta charset="utf-8"/>
  <style type="text/css">
    #div1 {width:488px;height:70px;padding:10px;border:1px solid #aaaaaa;}
  </style>
  <script type="text/javascript">
    //当元素dragover时候一定要阻止默认事件， 否则把当前拖拽的元素就无法drop;
    function dragover(ev)
    {
      console.log(ev);
      ev.preventDefault();
    }

    //对于拖拽事件最重要的一个事件属性就是dataTransfer;
    function drag(ev)
    {
      console.log(ev);
      ev.dataTransfer.setData("Text",ev.target.id);
    }

    function drop(ev)
    {
      console.log(ev);
      var data=ev.dataTransfer.getData("Text");
      ev.target.appendChild(document.getElementById(data));
    }
  </script>
</head>
<body>

<p>请把图片拖放到矩形中：</p>

<div id="div1" ondrop="drop(event)" ondragover="dragover(event)"></div>
<br />
<img id="drag1" src="http://images0.cnblogs.com/news/24442/201507/081152502219706.gif" draggable="true" ondragstart="drag(event)" />

</body>
</html>

　　另外一个DEMO：

运行下面代码

<!DOCTYPE HTML>
<html>
<head>
  <meta charset="utf-8"/>
  <style type="text/css">
  </style>
</head>
<body>
  <p>What fruits do you like&#63;</p>
  <ol ondragstart="dragStartHandler(event)">
    <li draggable="true" data-value="fruit-apple">Apples</li>
    <li draggable="true" data-value="fruit-orange">Oranges</li>
    <li draggable="true" data-value="fruit-pear">Pears</li>
  </ol>
  <script>
    var internalDNDType = 'text/x-example'; // set this to something specific to your site
    function dragStartHandler(event) {
      if (event.target instanceof HTMLLIElement) {
        // use the element's data-value="" attribute as the value to be moving:
        event.dataTransfer.setData(internalDNDType, event.target.dataset.value);
        event.dataTransfer.effectAllowed = 'move'; // only allow moves
      } else {
        event.preventDefault(); // don't allow selection to be dragged
      }
    }
  </script>

  <p>Drop your favorite fruits below:</p>
  <ol ondrop="dropHandler(event)" ondragover="dragover(event)">
    <!-- don't forget to change the "text/x-example" type to something
    specific to your site -->
    <li>drop</li>
  </ol>
  <script>
    var internalDNDType = 'text/x-example'; // set this to something specific to your site
    function dropHandler(event) {
      var li = document.createElement('li');
      var data = event.dataTransfer.getData(internalDNDType);
      if (data == 'fruit-apple') {
        li.textContent = 'Apples';
      } else if (data == 'fruit-orange') {
        li.textContent = 'Oranges';
      } else if (data == 'fruit-pear') {
        li.textContent = 'Pears';
      } else {
        li.textContent = 'Unknown Fruit';
      }
      event.target.appendChild(li);
    };
    function dragover(ev) {
      ev.preventDefault();
    };
  </script>
</body>
</html>

Copy after login

　　HTML5的拖拽提供了 setDragImage ， effectAllowed ， setData.... 等很多便捷的方法给开发者, 通过FileReader读取File，然后就可以用ajax与后台进行交互，和前端DOM操作：

<!DOCTYPE HTML>
<html>
<head>
  <meta charset="utf-8"/>
  <style type="text/css">
  </style>
</head>
<body>
  <div id="div0" ondragover="dragover(event)" ondrop="drop(event)">
    drop拖放文件进来
  </div>
  <script>
    function dragover(ev) {
      ev.preventDefault();
    };
    function drop(ev) {
      var reader = new FileReader();
      reader.onload = function ( ev ) {
        var oDiv = document.createElement("div");
        oDiv.innerHTML = ev.target.result;
        document.body.appendChild( oDiv );
      };
      reader.readAsText( ev.dataTransfer.files[0] );
      ev.preventDefault();
    }
  </script>
</body>
</html>

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　　插件效果图：

　　最后完成的插件代码：




  
    
    
  
  

  
  

  
    
    

      
      
        

          
          
            
            
              
            
            
              
            
            
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              单元测试
            
          

          
          
            
          
          
            
          
          
            音频类型
          
        

          
            
            
              
            
            
              
            
            
              图片类型
            
          

          
            
            
              
            
            
              
            
            
              文档类型
            
          

          
            
            
              
            
            
              
            
            
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              单元测试
            
          

          
          
            
          
          
            
          
          
            音频类型
          
        

          
            
            
              
            
            
              
            
            
              图片类型
            
          

          
            
            
              
            
            
              
            
            
              文档类型
            
          

          
            
            
              
            
            
              
            
            
              视频类型
            
          


          
            
            
              
            
            
              
            
            
              单元测试
            
          

            
            
              
            
            
              
            
            
              音频类型
            
          

          
            
            
              
            
            
              
            
            
              图片类型
            
          

          
            
            
              
            
            
              
            
            
              文档类型
            
          

          
            
            
              
            
            
              
            
            
              视频类型
            
          


          

        
      
      
    
    <script>
      //模板引擎的代码
      (function () {
        //underscore抄的模板引擎;
        var escaper = /\\|'|\r|\n|\t|\u2028|\u2029/g;

        var escapes = {
          &quot;'&quot;:   &quot;'&quot;,
          '\\':   '\\',
          '\r':   'r',
          '\n':   'n',
          '\t':   't',
          '\u2028': 'u2028',
          '\u2029': 'u2029'
        };

        $.templateSettings = {
          evaluate  : /&lt;%([\s\S]+&amp;#63;)%&gt;/g,
          interpolate : /&lt;%=([\s\S]+&amp;#63;)%&gt;/g,
          escape   : /&lt;%-([\s\S]+&amp;#63;)%&gt;/g
        }
        $.template = function(text, data, settings) {
          var render;
          settings = $.extend({}, settings, $.templateSettings);

          // Combine delimiters into one regular expression via alternation.
          var matcher = new RegExp([
            (settings.escape || noMatch).source,
            (settings.interpolate || noMatch).source,
            (settings.evaluate || noMatch).source
          ].join('|') + '|$', 'g');

          // Compile the template source, escaping string literals appropriately.
          var index = 0;
          var source = &quot;__p+='&quot;;
          text.replace(matcher, function(match, escape, interpolate, evaluate, offset) {
            source += text.slice(index, offset)
                .replace(escaper, function(match) { return '\\' + escapes[match]; });

            if (escape) {
              source += &quot;'+\n((__t=(&quot; + escape + &quot;))==null&amp;#63;'':_.escape(__t))+\n'&quot;;
            }
            if (interpolate) {
              source += &quot;'+\n((__t=(&quot; + interpolate + &quot;))==null&amp;#63;'':__t)+\n'&quot;;
            }
            if (evaluate) {
              source += &quot;';\n&quot; + evaluate + &quot;\n__p+='&quot;;
            }
            index = offset + match.length;
            return match;
          });
          source += &quot;';\n&quot;;

          // If a variable is not specified, place data values in local scope.
          if (!settings.variable) source = 'with(obj||{}){\n' + source + '}\n';

          source = &quot;var __t,__p='',__j=Array.prototype.join,&quot; +
              &quot;print=function(){__p+=__j.call(arguments,'');};\n&quot; +
              source + &quot;return __p;\n&quot;;

          try {
            render = new Function(settings.variable || 'obj', '_', source);
          } catch (e) {
            e.source = source;
            throw e;
          }

          if (data) return render(data, _);
          var template = function(data) {
            return render.call(this, data);
          };

          // Provide the compiled function source as a convenience for precompilation.
          template.source = 'function(' + (settings.variable || 'obj') + '){\n' + source + '}';

          return template;
        };
      })();

      (function( fn ) {

        $( fn.call( $ ,$) );

      })(function ($) {

        $.timeLineSetting = {
          offsetTop : 100
        };

        $.extend($.fn, {
          timeLine : function() {
            $.each(this, function() {

              var _this = this,
                  eleDrag;
              $(this).delegate(".time-line-ul>li", "click", function( ev ) {
                $(".time-line-icon.active").removeClass("active");
                $(this).find(".time-line-icon").addClass("active");
                $("b").removeClass("show");
                $(this).find("b").addClass("show");
                $(_this).animate({scrollTop: this.offsetTop - $.timeLineSetting.offsetTop},300);
                ev.preventDefault();
              }).delegate(".time-line-ul>li","dragstart" , function(ev) {
                //不允许img和a的拖拽;
                if( ev.target&&ev.target.tagName.toLocaleLowerCase() === "img" || ev.target.tagName.toLocaleLowerCase() === "a") {
                  return false;
                };
                /*拖拽开始*/
                //拖拽效果
                ev.originalEvent.dataTransfer.effectAllowed = "move";
                eleDrag = ev.originalEvent.target;
                return true;
              }).delegate(".time-line-ul>li","dragenter" , function(ev) {
                return true;
              }).delegate(".time-line-ul>li", "dragover" , function(ev) {
                $(".time-line-ul>li.over").removeClass("over");
                $(this).addClass("over");
                $(".blank").remove();
                var $blank = $("<li class='blank' draggable='true'></li>");
                $(this).after( $blank );
                /*拖拽元素在目标元素头上移动的时候*/
                ev.preventDefault();
                return true;
              });
              $(".time-line-ul").bind("drop" , function(ev) {
                if(ev.target.tagName.toLocaleLowerCase() === "li") {
                  $(ev.target).after( eleDrag );
                };
                $(".blank").remove();
                $(".time-line-ul>li.over").removeClass("over");
                return false;
              });
            });
          }
        });
      });

      $(function() {
        var compile= $.template( $("#li-tpl").html() || "");

        //与客户端的交互事件;
        var orginalData = {};
        window.onWebMessage = function( msg ) {
          msg = JSON.parse(msg);
          switch( msg.type ) {
            case "setItems" :
              $(".time-line-ul").html( compile(msg.data) );
              //结构化复制;
              orginalData = JSON.parse(JSON.stringify(msg.data));
              break;

            case "setItem" :
              orginalData.items&&orginalData.items.splice(msg.data[0],0,msg.data[1]);
              $(".time-line-ul").html( compile(orginalData) );
              break;

            case "getItem" :
                var result = [];
                var lis = $(".time-line-ul li");
                for(var i=0; i<lis.length; i++) {
                  result.push( {
                    index : i,
                    src : $(lis[i]).find("img").attr("src"),
                    name : $(lis[i]).find("span").text()
                  });
                };
                alert(JSON.stringify( result ));
              break;

            case "active" :
              $(".time-line-icon.active").removeClass("active");
              $(".time-line-ul>li").eq( msg.data).find(".time-line-icon").addClass("active")
              break;

          };

        };

        //启用插件;
        $(".scroll-time-line").timeLine();
      })
    </script>