lovecoding
/
W250913


			
				
					
						
						
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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>
        var num = "a" * 1;
        console.log(num);
        // isNaN 判断当前类型是否为NaN
        console.log(Number.isNaN(num));
        
        var num2 = 123;
        // num2 += "";
        console.log(num2);
        console.log(num2.toString());
        
    </script>
</body>
</html>