说明：代码取自网络，注释为笔者学习时添加！
<!DOCTYPE html> <html> <head> <meta charset="utf-8" /> <title>事件练习：封闭兼容性添加，删除事件的函数</title> <style> pre{ color:green; padding:10px 15px; background:#f0f0f0;/*白色*/ border:1px solid #333;/*黑色*/ font:12px/1.5 Courier New;/*行高18*/ } span{ color:#999;/*灰黑色*/ } </style> <script> var EventUtil = { addHandler: function (oElement, sEvent, fnHandler) { oElement.addEventListener ? oElement.addEventListener(sEvent, fnHandler, false) : oElement.attachEvent("on" + sEvent, fnHandler) }, removeHandler: function (oElement, sEvent, fnHandler) { oElement.removeEventListener ? oElement.removeEventListener(sEvent, fnHandler, false) : oElement.detachEvent("on" + sEvent, fnHandler) }, addLoadHandler: function (fnHandler) { this.addHandler(window, "load", fnHandler) } }; EventUtil.addLoadHandler(function () { var aBtn = document.getElementsByTagName("input"); //为第一个按钮添加绑定事件 EventUtil.addHandler(aBtn[1], "click", function () { EventUtil.addHandler(aBtn[0], "click", fnHandler); aBtn[0].value = "我可以点击了" }); //解除第一个按钮的绑定事件 EventUtil.addHandler(aBtn[2], "click", function () { EventUtil.removeHandler(aBtn[0], "click", fnHandler); aBtn[0].value = "毫无用处的按钮" }); //事件处理函数 function fnHandler () { alert("事件绑定成功！") } }) </script> </head> <body> <pre> <script type="text/javascript"> var EventUtil = { addHandler: function (oElement, sEvent, fnHandler) { oElement.addEventListener ? oElement.addEventListener(sEvent, fnHandler, false) : oElement.attachEvent("on" + sEvent, fnHandler) }, removeHandler: function (oElement, sEvent, fnHandler) { oElement.removeEventListener ? oElement.removeEventListener(sEvent, fnHandler, false) : oElement.detachEvent("on" + sEvent, fnHandler) }, addLoadHandler: function (fnHandler) { this.addHandler(window, "load", fnHandler) } } </script> </pre> <center><input type="button" value="毫无用处的按钮"> <input type="button" value="绑定click"> <input type="button" value="解除绑定"></center> </body> </html>