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In-depth understanding of each usage in jquery

高洛峰Original: 2016-12-29 11:10:501476browse

1 way to traverse li through each to get all the contents of li

<!-- 1种 -->
  <ul class="one">
    <li>11a</li>
    <li>22b</li>
    <li>33c</li>
    <li>44d</li>
    <li>55e</li>
  </ul>
  <button>输出每个li值</button>
<script>
  // 1种 通过each遍历li 可以获得所有li的内容
  $("button").click(function(){ 
    $(".one > li").each(function(){
      // 打印出所有li的内容
      console.log($(this).text());
    })
  });
</script>

2 way to traverse li through each and add events to each li through $(this)

<!-- 2种 -->
  <ul class="two">
    <li>2222</li>
    <li>22b</li>
    <li>3333</li>
    <li>44d</li>
    <li>5555</li>
  </ul>
<script>
  // 2种 通过each遍历li 通过$(this)给每个li加事件
  $(&#39;.two > li&#39;).each(function(index) {
    console.log(index +":" + $(this).text());
    // 给每个li加click 点那个就变颜色
    $(this).click(function(){
      alert($(this).text());
      $(this).css("background","#fe4365");
    });
  });
</script>

4 ways to traverse all li Add class name to all li

<!-- 4种 -->
  <ul class="ctn3">
    <li>Eat</li>
    <li>Sleep</li>
    <li>3种</li>
  </ul>
  <span>点击3</span>
<script>
  // 4种 遍历所有li 给所有li添加 class类名
  $(&#39;span&#39;).click(function(){
    $(&#39;.ctn3 > li&#39;).each(function(){
      $(this).toggleClass(&#39;example&#39;);
    })
  });
</script>

5 kinds In each() loop element == $(this)

<!DOCTYPE html>
<html>
<head>
  <meta charset="UTF-8">
  <title>each练习2</title>
  <style>
    div {
      width: 40px;
      height: 40px;
      margin: 5px;
      float: left;
      border: 2px blue solid;
      text-align: center;
    }
    span {
      width: 40px;
      height: 40px;
      color: red;
    }
  </style>
</head>
<body>
  <div></div>
  <div></div>
  <div></div>
  <div id="stop">Stop here</div>
  <div></div>
  <div></div>
  <button>Change colors</button>
  <span></span>
</body>
<script src="jquery-1.11.1.min.js"></script>
<script >
   // 在each()循环里 element == $(this)
  $(&#39;button&#39;).click(function(){
    $(&#39;div&#39;).each(function(index,element){
      //element == this;
      $(element).css("background","yellow");
 
      if( $(this).is("#stop")){
        $(&#39;span&#39;).text("index :" + index);
        return false;
      }
    })
  })
</script>
</html>

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