lovecoding
/
Web1020


			
				
					
						
						
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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 num = Symbol();
        let num2 = Symbol();
        console.log(num);
        let obj = {
            userName:"张三",
            age:20
        }
        obj[num] = "李四";
        obj[num2] = "王五";

        obj.age = 18;
        console.log(obj);
        console.log(obj[num]);
        // Symbol不能被for in遍历
        for(let key in obj){
            console.log(key);
        }
    </script>
</body>
</html>