<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title></title>
    <script type="text/javascript">
        /**
         * 函数的使用方式
         *      当作普通函数调用
         *      当作构造器使用
         *      当作参数传递
         */

        function test(msg){
            alert(msg);
        }

        //test("Hello")

        //var b = new test("lisi");
        //console.log(b);

        function process(n1,b){
            b(n1);
        }
        function ttt(n1){
            var aaa = n1+200;
            console.log(123+n1);
            return function(){
                console.log(n1+aaa);
            }
        }
        process(124,ttt(123));


        function clc(n1,n2,handler){
            /**
             * 对传入的数据进行容错
             */
            var num = handler(n1,n2);

            /**
             * 对得到的结果进行处理
             */

            return num;
        }

        var num = clc(123,234,function(a,b){
            return a+b;
        });
        var num1 = clc(123,234,function(a,b){
            return a/b;
        });

        console.log(num);

        var arr = [function (){alert(1)},function (){alert(2)},function (){alert(3)},function (){alert(4)}]

        arr[0]();
    </script>
</head>
<body>

</body>
</html>