案例:javascript案例     状态:可编辑再运行    进入竖版
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<html>
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<head>
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<script type="text/javascript">
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function disable()
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  {
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  document.getElementById("mySelect").disabled=true
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  }
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function enable()
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  {
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  document.getElementById("mySelect").disabled=false
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  }
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</script>
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</head>
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<body>
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<form>
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<select id="mySelect">
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  <option>苹果</option>
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  <option>桃子</option>
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  <option>香蕉</option>
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  <option>桔子</option>
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</select>
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<br /><br />
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<input type="button" onclick="disable()" value="禁用列表">
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<input type="button" onclick="enable()" value="启用列表">
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</form>
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</body>
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</html>
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