<!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 += " 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。