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>
        var arr = new Array();
        var obj = new Object();
        var x = new Number();
        var y = new String();
        var z = new Boolean();
        console.log(arr,obj,x,y,z);
        var a = 4.78475873;
        // 取整
        console.log(parseInt(a));
        // 保留浮点数
        console.log(parseFloat(a));
    </script>
</body>
</html>