1.作用
isNaN() 函数用于检查其参数是否是非数字值。
2.JS
<script> document.write(isNaN(123)); document.write(isNaN(-1.23)); document.write(isNaN(5-2)); document.write(isNaN(0)); document.write(isNaN("Hello")); document.write(isNaN("2005/12/12")); </script>
false false false false true true
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