<script type="text/javascript">
var type = function(data) {
var toString = Object.prototype.toString;
var dataType = data instanceof Element ? 'element' : toString.call(data).replace(/\[object\s(.+)\]/, '$1') .toLowerCase()
return dataType
}
let s={};
console.log(type("a"));
console.log(type(s));
</script>
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