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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<script type="text/javascript">
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document.write(parseFloat("10") + "<br />") 
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document.write(parseFloat("10.00") + "<br />") 
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document.write(parseFloat("10.33") + "<br />") 
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document.write(parseFloat("34 45 66") + "<br />") 
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document.write(parseFloat("   60   ") + "<br />") 
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document.write(parseFloat("40 years") + "<br />")
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document.write(parseFloat("He was 40") + "<br />")
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</script>
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</body>
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</html>
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