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															+<!DOCTYPE html> 
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															+<html lang="en"> 
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															+<head> 
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															+  <meta charset="UTF-8"> 
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															+  <meta http-equiv="X-UA-Compatible" content="IE=edge"> 
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															+  <meta name="viewport" content="width=device-width, initial-scale=1.0"> 
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															+  <title>Document</title> 
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															+  <style> 
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															+    .xx{ 
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															+      background: red; 
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															+    } 
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															+    #divn{ 
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															+      width: 200px; 
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															+      height: 200px; 
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															+      background: aquamarine 
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															+    } 
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															+  </style> 
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															+</head> 
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															+<body> 
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															+  <div id="div1"> 
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															+    hhhhhhhh 
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															+    <div id="div3">llllllllll</div> 
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															+  </div> 
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															+  <div id="div2">xxxxxxx</div> 
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															+  <div class="xx">11111111111111</div> 
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															+  <div class="xx">222222222222222222</div> 
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															+  <div class="xx">333333333333333</div> 
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															+ 
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															+  <ul id="ul1"> 
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															+    <li>1</li> 
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															+    <li>2</li> 
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															+    <li>3</li> 
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															+  </ul> 
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															+  <ul id="ul2"> 
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															+    <li class="xx">4</li> 
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															+    <li>5</li> 
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															+    <li class="xx">6</li> 
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															+    <li>7</li> 
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															+    <li class="xx">8</li> 
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															+    <li>9</li> 
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															+  </ul> 
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															+  <button id="btn">点击</button> 
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															+  <div id="divn">我是正方形</div> 
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															+  <script> 
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															+    var div1 = document.getElementById('div1') 
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															+    var xx = document.getElementsByClassName('xx') // 数组 
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															+ 
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															+    var ul1 = document.getElementById('ul1') 
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															+    var uli = ul1.getElementsByTagName('li') 
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															+     
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															+    var ul2 = document.getElementById('ul2') 
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															+    var xli = ul2.getElementsByClassName('xx') 
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															+ 
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															+    var btn = document.getElementById('btn') 
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															+    var divn = document.getElementById('divn') 
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															+ 
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															+    console.log(xli) 
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															+    div1.onclick = function(){ 
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															+      console.log(xx) 
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															+    } 
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															+ 
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															+    for(var i=0;i<xx.length;i++){ 
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															+      console.log(xx[i]) 
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															+      xx[i].onclick = function(){ 
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															+        console.log('我是11') 
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															+      } 
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															+    } 
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															+ 
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															+    for(var i=0;i<uli.length;i++){ 
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															+      uli[i].onclick = function (){ 
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															+        console.log('我是uli') 
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															+      } 
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															+    } 
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															+ 
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															+    for(var i=0;i<xli.length;i++){ 
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															+      xli[i].style.background = 'yellow' 
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															+    } 
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															+    btn.onclick = function(){ 
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															+      divn.style.width = '400px' 
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															+    } 
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															+  </script> 
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															+</body> 
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															+</html> 
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