案例:javascript案例     状态:可编辑再运行    进入竖版
 运行结果 
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<html>
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<body>
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<form id="myForm" method="get">
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Name: <input type="text" size="20" value="Peter Griffin" /><br />
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Text: <input type="text" size="20" value="Hello World" />
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</form>
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<script type="text/javascript">
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document.write("Number of elements in myForm: ");
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document.write(document.getElementById('myForm').length);
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</script>
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</body>
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</html>
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