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 name="Form1"></form>
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<form name="Form2"></form>
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<form name="Form3"></form>
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<script type="text/javascript">
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document.write("文档包含: " + document.forms.length + " 个表单。")
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</script>
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</body>
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</html>
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