<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>DOM0级DOM2级</title> </head> <body> <input type="button" value="click1"> <input type="button" value="click2"> <input type="button" value="click3"> <script> function show() { alert("btn1"); } //DOM0级 var btn2 = document.getElementById("btn2"); btn2.onclick = function () { alert("DOM0级btn2"); }; //DOM2级 function show2() { alert("DOM2级btn3"); } var btn3 = document.getElementById("btn3"); // btn3.addEventListener("click",show2,false); // btn3.removeEventListener("click",show2,false); //ie事件处理程序 // btn3.attachEvent("onclick",show2); // btn3.detachEvent("onclick",show2); //跨浏览器事件处理程序 //能力检测 var eventUtil = { //添加具柄； addHandler:function (element,type,handler) { if (element.addEventListener){ element.addEventListener(type,handler,false); }else if(element.attachEvent){ element.attachEvent("on"+type,handler); }else { element["on"+type]=handler; } }, //删除具柄； removeHandler:function (element,type,handler) { if (element.removeEventListener){ element.removeEventListener(type,handler,false); }else if(element.detachEvent){ element.detachEvent("on"+type,handler); }else { element["on"+type]=null; } } }; eventUtil.addHandler(btn3,"click",show2); eventUtil.removeHandler(btn3,"click",show2); </script> </body> </html>
JavaScript事件处理程序详解
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