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第一种: el.setAttribute('class','abc');
- <!DOCTYPE HTML>
- <HTML>
- <HEAD>
- <meta charset="utf-8" />
- <title>setAttribute('class', 'abc')</title>
- <style type="text/css">
- .abc {
- background: red;
- }
- </style>
- </HEAD>
- <BODY>
- <div id="div">test div</div>
- <script>
- var div = document.getElementById('div');
- div.setAttribute("class", "abc");
- </script>
- </BODY>
- </HTML>

- <!DOCTYPE HTML>
- <HTML>
- <HEAD>
- <meta charset="utf-8" />
- <title>setAttribute('className', 'abc')</title>
- <style type="text/css">
- .abc {
- background: red;
- }
- </style>
- </HEAD>
- <BODY>
- <div id="div">test div</div>
- <script>
- var div = document.getElementById('div');
- div.setAttribute("className", "abc");
- </script>
- </BODY>
- </HTML>

- <!DOCTYPE HTML>
- <HTML>
- <HEAD>
- <meta charset="utf-8" />
- <title>el.className = 'abc'</title>
- <style type="text/css">
- .abc {
- background: red;
- }
- </style>
- </HEAD>
- <BODY>
- <div id="div">test div</div>
- <script>
- var div = document.getElementById('div');
- div.className = 'abc';
- </script>
- </BODY>
- </HTML>

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