<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title></title>
</head>
<body>
<script>
var obj = {100:"于春辉"},
console.log(obj[100])
console.log(obj["100"])
Symbol(123) === Symbol(123) //false
//对象的属性名不能是对象,遇到的话会默认调用自己的toString()
</script>
</body>
</html>