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<title>用typeof查看数据类型</title>
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<pre>
<script type="text/javascript">
alert(typeof 12345); <span>//输出number</span>
alert(typeof "abc"); <span>//输出string</span>
alert(typeof document); <span>//输出object</span>
</script>
</pre>
<script>
alert("typeof 12345 → " + typeof 12345 + "\
\n\ntypeof \"abc\" → " + typeof "abc" + "\
\n\ntypeof document → " + typeof document
);
</script>
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用typeof查看数据类型
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转载自blog.csdn.net/qq_39918584/article/details/82789450
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