javaScript中null和undefined是什么数据类型?

直接上代码和截图

运行结果如下：

<script type="text/javascript">
//false "object" "object"
console.log(null instanceof Object, typeof(null), typeof null);
//false "undefined" "undefined"
console.log(undefined instanceof Object, typeof(undefined), typeof undefined);
//true false
console.log(undefined == null, undefined === null);
</script>

console.log(typeof null)的结果为object

console.log(null instanceof Object)的结果为false