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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')
Output 300px

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anonymouspro
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