js判断数组和对象

    <script>
    var arr=new Array();
    var obj={'1':2};
    var num=11;
    function isType(obj){
    if(obj instanceof Array)
    return 'Array';
    else if(obj instanceof Object)
    return 'Object';
    else 
    return 'notObj'
    }
    console.log(isType(arr));
    console.log(isType(obj));
    console.log(isType(num));;
    </script>