js中arguments,caller,callee,apply的用法小结 

<!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。

posted on 2016-01-08 20:45  防空洞123  阅读(261)  评论(0)  编辑  收藏  举报

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