lovecoding
/
W260426


			
				
					
						
						
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							<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <script>
        let obj = {
            userName:"张三",
            age:18
        }
        obj.sex = "男";
        // 对象中属性名是唯一且不允许重复的
        obj.age = 20;

        // symbol 类型表示唯一的,不能重复
        let sym = Symbol("sym");
        let sym2 = Symbol("sym");
        let sym3 = Symbol();
        obj[sym] = "hello";
        obj[sym2] = "world";
        obj[sym3] = "你好";

        // console.log(obj);
        // console.log(obj[sym]);

        for(let key in obj){
            console.log(key);
        }

        
    </script>
</body>
</html>