用Jquery去写树结构

<!DOCTYPEhtml>

<html>

<head>

<metacharset="utf-8">

<title>Tree Menu</title>

</head>

<body>

  <divclass="lmenu">

    <ul>

      <liaid="26">

        <span> <emclass="icoopen"></em>

          一级标题

        </span>

        <ulstyle="display: none;">

          <liaid="27"> <emclass="iconleaf"></em>

            二级标题

          </li>

          <liaid="28">

            <emclass="iconleaf"></em>

            二级标题

          </li>

          <liaid="29">

            <emclass="iconleaf"></em>

            二级标题

          </li>

        </ul>

      </li>

      <liaid="1">

        <span>

          <emclass="icoclose"></em>

          一级标题

        </span>

        <ulstyle="display: block;">

          <liaid="4">

            <emclass="iconleaf"></em>

            二级标题

          </li>

          <liaid="2">

            <emclass="iconleaf"></em>

            二级标题

          </li>

          <liaid="8">

            <span>

              <emclass="icoclose2"></em>

              二级标题

            </span>

            <ul>

              <liaid="10">

                <emclass="iconleaf2"></em>

                三级标题

              </li>

              <liaid="3">

                <emclass="iconleaf2"></em>

                三级标题

              </li>

            </ul>

          </li>

          <liaid="5">

            <span>

              <emclass="icoclose2"></em>

              二级标题

            </span>

            <ul>

              <liaid="7">

                <emclass="iconleaf2"></em>

                三级标题

              </li>

              <liaid="6">

                <emclass="iconleaf2"></em>

                三级标题

              </li>

            </ul>

          </li>

        </ul>

      </li>

      <liaid="11">

        <span>

          <emclass="icoclose"></em>

         一级标题

        </span>

        <ul>

          <liaid="17">

            <span>

              <emclass="icoclose2"></em>

              二级标题

            </span>

            <ul>

              <liaid="25">

                <emclass="iconleaf2"></em>

                三级标题

              </li>

              <liaid="23">

                <emclass="iconleaf2"></em>

                三级标题

              </li>

              <liaid="22">

                <emclass="iconleaf2"></em>

                三级标题

              </li>

            </ul>

          </li>

          <liaid="12">

            <span>

              <emclass="icoclose2"></em>

              二级标题

            </span>

            <ul>

              <liaid="15">

                <emclass="iconleaf2"></em>

                三级标题

              </li>

              <liaid="16">

                <emclass="iconleaf2"></em>

                三级标题

              </li>

              <liaid="14">

                <emclass="iconleaf2"></em>

                三级标题

              </li>

            </ul>

          </li>

        </ul>

      </li>

    </ul>

  </div>

  <style>

*{

margin: 0;

padding: 0;

  }

.icoopen , .icoopen2 , .icoclose , .icoclose2 , .iconleaf , .iconleaf2 ,.lmenuullispan ,.search-sidebutton{background: url("doc.png") no-repeat00;width: 9px;height: 9px;top: 9px;}

.lmenuli{list-style: none;}

.lmenuem {display: block;position: absolute;cursor: pointer;}

.icoopen{left: 28px;background-position: 0-39px;}

.icoopen2{left: 42px;background-position: -46px-88px;}

.icoclose{left: 28px;background-position: -45px-39px;}

.icoclose2{left: 42px;background-position: 0-88px;}

.iconleaf , .iconleaf2{width: 3px;height: 5px;background-position: -87px-41px;}

.iconleaf {left: 47px;top: 11px;}

.iconleaf2 {left: 72px;top: 10px;}

.search-side{

width: 250px;

border-radius: 5px;

position: relative;

background-color: #FFFFFF;

border: 1pxsolid#ddd;

height: 36px;

line-height: 36px;

  }

.search-sidebutton{

background-position: 00;

border: 0none;

cursor: pointer;

display: block;

height: 16px;

width: 16px;

position: relative;

left: 11px;

  }

.search-boxinput{

position: absolute;

top: 11px;

background-color: transparent;

border: mediumnone;

color: #AFB0B0;

height: 16px;

margin-left: 37px;

outline: mediumnone;

width: 200px;

  }

.lmenu{

width: 250px;

height: auto;

overflow: hidden;

font-family: "宋体",Tahoma, Helvetica, "Microsoft Yahei", "微软雅黑", Arial, STHeiti;

margin-bottom: 10px;

border: 1pxsolid#ddd;

border-radius: 5px;

  }

.lmenuulli{

position: relative;

cursor: pointer;

  }

.lmenuulliul{

max-height: 350px;

overflow: auto;

  }

.lmenuulliulliul{

height: auto;

  }

.lmenuullispan{

display: block;

width: 100%;

height: 28px;

line-height: 28px;

text-indent: 3em;

/*font-weight: bolder;*/

font-size: 14px;

color: #0E3E5E;

border-bottom: 1pxsolid#D7D7D7;

background-position: -46px0;

  }

.lmenuulliulli , .lmenuulliullispan{

/*background-color: #F7F8F8;*/

background-color: #FFFFFF;

color: #333;

text-indent: 5em;

font-size: 13px;

height: auto;

line-height: 28px;

  }

.lmenuulliullispan{

background:none;

  }

.lmenuulliulliulli{

border:none;

text-indent: 7em;

font-size: 12px;

font-weight: normal;

height: 24px;

line-height: 24px;

  }

  </style>

  <scripttype="text/javascript"src="jquery-3.2.1.js"></script>

  <script>

$(function() {

loadMenu(function (id){

// window.location= "";此处指定关于aid的链接

        });

      });

/*传入一个函数参数为 id 即li上的属性 aid*/

functionloadMenu (fun_clickAction) {

/*事件回调函数*/

      clickAction = fun_clickAction;

/*一级菜单的样式*/

$(".lmenu > ul > li > span").prepend('<em class="icoclose"></em>');

/*二级菜单的样式*/

$(".lmenu > ul > li > ul > li").each(function(){

/*检查是否有节点*/

        span =$(this).find("span"); 

if ( span.length ){

//有节点的话

          span.prepend('<em class="icoclose2"></em>');

        }else{

//无节点的话,绑定事件

$(this).prepend('<em class="iconleaf"></em>')

               .click(function(){

clickAction($(this).attr('aid'));

               });

        }

      });

/*三级菜单的样式*/

$(".lmenu > ul > li > ul > li > ul > li")

        .prepend('<em class="iconleaf2"></em>')

        .click(function(){

clickAction($(this).attr('aid'));

        });

$(".lmenu ul li span").click(function(){

var ye =$(this).find('em');

        classNama = ye.attr("class");

if( classNama =='icoclose'){ye.attr('class','icoopen');}

elseif( classNama =='icoopen' ){ye.attr('class','icoclose');}

elseif( classNama =='icoclose2'){ye.attr('class','icoopen2');}

elseif( classNama =='icoopen2' ){ye.attr('class','icoclose2');}

$(this).siblings("ul").slideToggle("normal","swing");

      });

    }

  </script>

</body>

</html>
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