lovecoding
/
class


			
				
					
						
						
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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>
        /**
         * 数据类型：
         * null undefined boolean string number object
         * symbol 独一无二的
         * 
         */
         var a = Symbol();
         console.log(a);

         var a1 = Symbol(1);
         var a2 = Symbol(1);
        //  就算传入的值相同 也是false
         console.log(a1 === a2);
    </script>
</body>
</html>