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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<!DOCTYPE html>
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<html>
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<head>
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<script>
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function alertType()
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{
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alert(document.getElementById("myButton").type)
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}
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</script>
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</head>
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<body>
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​
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<button id="myButton" type="button" onclick="alertType()">点击这里</button>
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​
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</body>
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</html>
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​