JavaScript event handlers explained in detail
This article mainly introduces the relevant information of JavaScript event handler to you in detail. It has certain reference value. Interested friends can refer to it. I hope it can help everyone.
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>DOM0级DOM2级</title>
</head>
<body>
<input id="btn1" type="button" value="click1" onclick="show()">
<input id="btn2" type="button" value="click2">
<input id="btn3" 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>Related recommendations:
Vue methods and event handling issues
Detailed explanation of examples of event handlers in JavaScript
JavaScript study notes (5) Event flow and event processing function allocation of event processing
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