xxxxxxxxxx<html><head><meta charset="utf-8"><title>W3Cschool教程(w3cschool.cn)</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>