js中arguments,caller,callee,apply的用法小结

时间：2022-07-11 16:23:28
<!DOCTYPE HTML>

<html>

<head>

<meta charset="UTF-8">

<style type="text/css">

    *{padding: 0;margin: 0;}

    #img{position: absolute;}

</style>

</head>

<body>

    <img id="img" src="img/xi.png">

    <script type="text/javascript" src="js/jquery-1.8.3.min.js"></script>

    <script type="text/javascript">

        function ArgTest(a,b){

            var i,s = "The ArgTest function expected";

            //实际传入的参数个数

            var numargs = arguments.length;

            //期望的参数个数

            var expargs = ArgTest.length;

            alert(numargs+","+expargs);

            for(i = 0;i<numargs;i++){

                s += "\n Arg "+ i + "="+arguments[i]+"";

            }

            alert(s);

        }

        function test1(a,b,c){

            //期望的参数个数

            alert(test1.length)

        }

        function callerDemo(){

            //本函数对象callee

            alert(arguments.callee.name)

            //被调用的函数的信息

            if(callerDemo.caller){

                var a = callerDemo.caller.toString();

                var namestr = callerDemo.caller.name;

                // debugger;

                alert(namestr);//handlecaller

            }else{

                alert("this is a top function")

            }

        }

        function handlecaller(){

            callerDemo();

        }

        handlecaller();

        // ArgTest(1,2);

        // test1();

    </script>

</body>

</html>

arguments

对象代表正在执行的函数和调用它的函数的参数。

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