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test11.html

<!DOCTYPE html>
<html>
    <head>
        <title>11Javascript数据类型转换</title>
        <meta charset="UTf-8">
    </head>
    <body>
        <h1>11Javascript数据类型转换</h1>
        <script>
        //typeof 操作符
        document.write(typeof "john");
        var x = 3.14;
        document.write(typeof x);
        var cars = Array();
        cars[0] = "BYD";
        cars[1] = "BENZ";
        document.write(typeof cars);//返回object 类型
        document.write(x.constructor);
        function isArray(myArray){  //使用constructor来判定对象中是否包括数组的内容
            return myArray.constructor.toString().indexOf("Array")>-1;
        }
        document.write(isArray(cars));
        //类型转换
        y = String (x);
        document.write (typeof y);
        y = Number (y);
        document.write (typeof y);
        </script>
    </body>
</html>