源代码:
<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>Wfuyu教程(wfuyu.com)</title> </head> <body> <p> arguments.length 属性返回函数接收到参数的个数：</p> <p id="demo"></p> <script> function myFunction(a, b) { return arguments.length; } document.getElementById("demo").innerHTML = myFunction(4, 3); </script> </body> </html>
运行结果：