要检查变量是否为数组，请使用“ instanceof。以下是语法-
variable instanceof Array
让我们看一个检查变量“ sports”是否为数组的示例？
<xmp>
<html>
<body>
<script>
var sports = [ "tennis", "football", "cricket" ];
if (sports instanceof Array) {
alert('Array!');
} else {
alert('Not an array');
}
</script>
</body>
</html>
</xmp>