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															 <!DOCTYPE html> 
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															 <!DOCTYPE html> 
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															 <html lang="en"> 
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															 <html lang="en"> 
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															 <head> 
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															 <head> 
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															   <meta charset="UTF-8"> 
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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 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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															   <meta name="viewport" content="width=device-width, initial-scale=1.0"> 
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															   <title>Document</title> 
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															   <title>Document</title> 
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															+  <style> 
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															+    #div1 { 
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															+      width: 200px; 
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															+      height: 200px; 
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															+      background: red; 
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															+      top: 200px; 
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															+      left: 100px; 
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															+      position: absolute 
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															+    } 
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															+  </style> 
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															+  <script> 
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															+    //等页面所有的东西全部加载完毕,执行里面的内容 
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															+    // window.onload = function () { 
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															+    //   var btn = document.getElementById('btn') 
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															+    //   console.log(btn) 
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															+    // } 
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															+  </script> 
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															 </head> 
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															 </head> 
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															+ 
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															 <body> 
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															 <body> 
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															-   
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															+  <button id="btn">点击</button> 
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															+  <div id="div1"> 
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															+  </div> 
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															+  <script> 
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															+    var btn = document.getElementById('btn') 
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															+    console.log(btn) 
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															+    // var div1 = document.getElementById('div1') 
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															+    // btn.onclick = function(){ 
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															+    //   div1.style.background = 'blue' 
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															+    //   div1.style.top = '400px' 
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															+    //   div1.style.left = '250px' 
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															+    // } 
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															+  </script> 
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															 </body> 
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															 </body> 
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															+ 
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															 </html> 
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															 </html> 
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