1. 防止this重名,可以通过设置值,然后通过参数传递过去
<!DOCTYPE html> <html> <head lang="en"> <meta charset="UTF-8"> <title></title> </head> <body> <input type="button" value="按钮1"/> <input type="button" value="按钮2"/> <input type="button" value="按钮3"/> <script> window.onload = function(){ var aBtn = document.getElementsByTagName('input'); for (var i = 0; i < aBtn.length; i++) { aBtn[i].onclick = function(){ var _this = this; changeBackground(_this);//前面不带东西 就是 : window.changeBackground(_this) } } } function changeBackground(_this){ _this.style.background = 'red'; } </script> </body> </html>