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<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <title>JS Bin</title>
</head>
<body>
<input type="text" id="text" value="ok"/>
<input type="button" value="生成随机数" onclick="my_ran4(3,2,20)" id="cre" />
<input type="button" value="清空" onclick="del()" />
</body>
</html>
Output 300px

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