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<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
  <title>JS Bin</title>
</head>
<body>
<div id="div1">
  测试
</div>
</body>
</html>
 
// function addClass(node, className){
//     node.classList.add(className)
// }
// var dom = {}
// dom.addClass = addClass
// // 使用
// var element = document.querySelector('#div1')
// console.log(element)
// dom.addClass(element, 'active')
Node.prototype.addClass = function(className){
    this.classList.add(className)
}
// 使用
var element = document.querySelector('#div1')
element.addClass('active')
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anonymouspro
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