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jquery's powerful selector vs. JavaScript.

Source: Internet
Author: User
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Case List Demo:http://codepen.io/tianzi77/pen/ynjvam
First write the structure:

<body><ul id="nav">    <li class="Current">Tianzi</li>    <li>Tianzi</li>    <li>Tianzi</li></ul><div id="Content"><div class="Show">Content Area</div><div>Content1</div><div>Content2</div></div>

Then add a style:

*{  padding:0;  margin: 0; }Body{  margin:0 ;} #nav{  width: + px;     height: px;     line-height: .     list-style: none;     Border-radius: px;  margin-bottom: 5px; }#nav Li{  float: left;     padding-right: tenpx;     border-left: 1px solid green;     font-size: 2em;     font-family: "Microsoft Jas Black";  cursor: pointer; }#nav Li. current{  background: #abcdef;} #nav Li: Hover{  color: #fff;     background: red;  cursor: pointer; }#content Div{  width: px;     Height: + px;     Border:1px solid blue;     box-sizing:border-box;  display: none; }#content Div. Show{  display: block;}

Pure JavaScript Control performance:

Window.onload= function(){varUl=document.getelementbyid ("NAV");varLi=ul.getelementsbytagname ("Li");varContent=document.getelementbyid ("Content");varDiv=content.getelementsbytagname (' div '); for(varI=0; i<li.length;i++) {li[i].index=i; li[i].onclick= function(){         for(varj=0; j<li.length;j++) {li[j].classname=""; div[j].style.display="None"; } This. classname="Current"; div[ This. index].style.display="Block"; }}}

With JS write code more, and there are 2 layers of loop is very forgive. So I wrote it in jquery:
JQ Code:

$(function(){    $("ul li").click(function(){    $(this).addClass("current").siblings().removeClass("current");    $("#content div").eq($(this).index()).show().siblings().hide();})})

Basically 2 lines of code are done, because jquery supports powerful chained operations, so the above code can be reduced to one line:

$(this).addClass("current").siblings().removeClass("current").parent().next().children().eq($(this).index()).show().siblings().hide();

I have to say that jquery is really powerful, the study of its source code is defined as a powerful selector.

jquery's powerful selector vs. JavaScript.

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