Array
Object
String
Function
题目没问题,document.getElementById是Function,但document.getElementById的返回值不就相当于document.getElementById(‘xxx)自然就是Object
<div id="test"></div> <script type="text/javascript"> var test=document.getElementById('test'); console.log(document.getElementById); </script>
document.getElementById
var element = document.getElementById(id);
https://developer.mozilla.org/zh-CN/docs/Web/API/Document/getElementById
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