* Props to Dean Edwards' addEvent library for many of the ideas. */ jQuery.event = { } Dean Edwards...的 addEvent.js (http://dean.edwards.name/weblog/2005/10/add-event/)库为 jQuery 的事件绑定提供了很多想法，我们就来看下 2005...年的 addEvent.js 。...id addEvent.guid = 1; function addEvent(element, type, handler) { // assign each event handler...最后： 完整代码请看https://github.com/AttackXiaoJinJin/jQueryExplain/blob/master/addEvent.js.html ----
现在自己贴出根据DE模型，自己修改后的事件系统： addEvent.guid = 1; addEvent.events = {}; //简单缓存系统 function addEvent(el,type,...$$guid = addEvent.guid++; } if(!el.$$guid){ el....$$guid = addEvent.guid++; } if(!addEvent.events[el.$$guid]){ addEvent.events[el....fns){ fns = addEvent.events[el....$$guid in addEvent.events[el.$$guid][type]){ delete addEvent.events[el.$$guid][type][fn.
function addEvent(el, event, callback, isCapture = false) { if (!el || !event || !...(child, 'click', function (e) { console.log('child'); }); addEvent(parent, 'click',...function (e) { console.log('parent'); }); addEvent(grandparent, 'click', function (e)...('document'); }); addEvent('html', 'click', function (e) { console.log('html'); })...(child, 'click', function (e) { console.log('child'); }, true); addEvent(parent, 'click
我们知道javascript最大的问题就是浏览器的兼容问题，一个api在不同的浏览器调用的结果是不一样的，有的时候我们需要通过if判断来实现不同的兼容问题：kotlin 代码解读复制代码function addEvent...方案一第一种方案是函数在第一次调用时，对函数本身进行二次处理，该函数会被覆盖为符合分支条件的函数，这样对原函数的调用就不用再经过执行的分支了，我们可以用下面的方式使用惰性载入重写addEvent()。...kotlin 代码解读复制代码function addEvent (type, element, fun) { if (element.addEventListener) { addEvent...(type, element, fun);}在这个惰性载入的addEvent()中，if语句的每个分支都会为addEvent变量赋值，有效覆盖了原函数。...一下就是按照这一思路重写的addEvent()。
——圣·普波 在js中我们可以使用惰性函数，用于重新定义函数自身的行为 例如： function addEvent(type, el, fn) { if (window.addEventListener...) { addEvent = function(type, el, fn) { el.addEventListener(type, fn, false); } } else...if (window.attachEvent) { addEvent = function(type, el, fn) { el.attachEvent('on' + type,...fn); } } else { addEvent = function(type, el, fn) { el['on' + type] = fn; } }...addEvent(type, el, fn); } // 第一次调用会进行环境判断，之后的调用就会直接使用适合当前环境的函数实现 addEvent('click', document.getElementById
// 闭包的使用场景：一个方法要被多次调用，并且共享一个数据 // 防抖和节流 // 自执行函数省去单独调用一次 let addEvent = (function() {...of obj[eventName]){ fn(); } }) } } })() addEvent...('mouseover',function () { console.log("鼠标进入") }) addEvent('click',function () { console.log(..."click1") }) addEvent('click',function () { console.log("click2") }) addEvent('click',function ()...{ console.log("click3") }) addEvent('click',function () { console.log("click4") })
在冒泡阶段，事件冒泡，或者事件发生在它的父代、祖父母， 祖父母的父代， 直到到达window为止 function addEvent(el, event, callback, isCapture = true...(child, 'click', function (e) { console.log('child'); }); addEvent(parent, 'click', function...(e) { console.log('parent'); }); addEvent(grandparent, 'click', function (e) {...console.log('grandparent'); }); addEvent(document, 'click', function (e) { console.log...('document'); }); addEvent('html', 'click', function (e) { console.log('html'); }
}; return foo(); }; 更多应用 DOM 事件添加中，为了兼容现代浏览器和 IE 浏览器，我们需要对浏览器环境进行一次判断： // 简化写法function addEvent...} else if(window.attachEvent){ el.attachEvent('on' + type, fn); } } 问题在于我们每当使用一次 addEvent...利用惰性函数，我们可以这样做： function addEvent (type, el, fn) { if (window.addEventListener) { addEvent...el.addEventListener(type, fn, false); } } else if(window.attachEvent){ addEvent...(type, el, fn) { el.attachEvent('on' + type, fn); } } } 当然我们也可以使用闭包的形式： var addEvent
const event = {}; event.addEvent = function(dom, type, fn) { if(dom.addEventListener) {...const event = {}; event.addEvent = function(dom, type, fn) { if(dom.addEventListener) {...event.addEvent = function(dom, type, fn) { dom.addEventListener(type, fn, false);...("on" + type, fn); } }else{ event.addEvent = function(dom, type, fn) {...dom["on" + type] = fn; } } event.addEvent(dom, type, fn); }; 每日一题 https://github.com/
1 EventUtil.addEvent(window,"load",function(){ 2 console.log(document.getElementById(...1 var img=document.getElementById("imgtest"); 2 EventUtil.addEvent(img,"load",function(event...1 EventUtil.addEvent(window,"resize",function(event){ 2 alert("resize"); 3...1 var img=document.getElementById("imgtest"); 2 EventUtil.addEvent(img,"mousedown",function...1 EventUtil.addEvent(document.getElementById("inputtext"),"keyup",function(event){ 2 event
var addEvent = function(el, type, fn, capture) { if (window.addEventListener) { el.addEventListener...el.attachEvent("on" + type, function(e) { fn.call(el, e); }); } }; 在这个例子中，我们每次调用addEvent...= addEventHandler();addEvent(document.body, "click", function() {}, false);addEvent(document.getElementById...("test"), "click", function() {}, false); 但是这样做还是有一种缺点，因为我们无法判断程序中是否使用了这个方法，但是依然不得不在文件顶部定义一下addEvent，...var addEvent = function(el, sType, fn, capture){ if (window.addEventListener) { addEvent =
var addEvent = function(el, type, fn, capture) { if (window.addEventListener) { el.addEventListener...("on" + sType, function(e) { fn.call(el, e); }); }; } } var addEvent...= addEventHandler(); addEvent(document.body, "click", function() {}, false); addEvent(document.getElementById...("test"), "click", function() {}, false); 但是这样做还是有一种缺点，因为我们无法判断程序中是否使用了这个方法，但是依然不得不在文件顶部定义一下addEvent...var addEvent = function(el, sType, fn, capture){ if (window.addEventListener) { addEvent
1.使用情况 （1）事件的监控 #1，利用页面的button来选择宠物的例子（思路） button.addEvent(element,"click",getPetByBame); function...id='+id,function(pet){ consols.log("request pet"+pet.resopnseText) }) } #2，addEvent...函数 /*obj:需要增加事件的对象 * type:事件名称 * fn:执行事件的函数 * */ function addEvent(obj,type,fn){//addEvent：为某个文档节点增加事件的方法...id='+id,function(pet){ callBack(pet) }) #2,桥梁 //定义一个桥梁叫抽象和实现相互联系在一起 addEvent(
_listener = {}; }; EventTarget.prototype = { constructor: this, addEvent: function(type, fn)...for (type in obj) { if ( type && typeof obj[type] === "function") { this.addEvent...el: document; }; $.init.prototype = { constructor: this, addEvent: function(type, fn, capture...; }; // 测试用的张小姐图片 var elImage = document.getElementById("image"); $(elImage) .addEvent("click...", fnClick) .addEvent("alert", funAlert1) .addEvent("alert", funAlert2); // 删除自定义事件按钮 var elButton
function addEvent(obj, type, fn) {//取代传统事件处理函数 var saved = null;//保存每次触发的事件处理函数 if (typeof obj['on' +...(这里就不做了) addEvent(window, 'load', init);//注册第一次 addEvent(window, 'load', init);//注册第二次，应该忽略 function ...('box'); addEvent(box, 'click', toBlue); }); function toRed() { this.className = 'red'; addEvent(this...addEvent(window, 'load', function () { var text = document.getElementById('text'); addEvent(text, 'contextmenu...addEvent(document, 'mousewheel', function (evt) {//非火狐 alert(getWD(evt)); }); addEvent(document, 'DOMMouseScroll
var addEvent = (function() { if (document.addEventListener...if (el.length) { for (var i = 0; i < el.length; i++) { addEvent...if (el.length) { for (var i = 0; i < el.length; i++) { addEvent...'data'), output = document.getElementById('fromEvent'), save = document.getElementById('save'); addEvent...output.innerHTML ="key:"+event.key+" ---- old:"+event.oldValue+" ---- new:"+ event.newValue; } }); addEvent
比如我们需要一个在各个浏览器中能够通用的事件绑定函数addEvent，常见的写法如下： 方案一： var addEvent = function(elem, type, handler) { if...addEvent = function(elem, type, handler) { elem.addEventListener(type, handler, false)...) { elem.attachEvent('on' + type, handler); } } addEvent(...elem, type, handler); }; 此时addEvent依然被声明为一个普通函数，在函数里依然有一些分支判断。...但是在第一次进入条件分支之后，在函数内部会重写这个函数，重写之后的函数就是我们期望的addEvent函数，在下一次进入addEvent函数的时候，addEvent函数里不再存在条件分支语句。
实例 var objEvent = objEvent || {}; (function(){ var addEvent = function(){ // some code ...}; function removeEvent(){ // some code } objEvent.addEvent = addEvent; objEvent.removeEvent
1: 2: 3: var addEvent...[title], title, event.target.href); 84: reportData(data[title]); 85: } 86: }); 87: 88: addEvent...(event.state || { url: "unknown", name: "undefined", location: "undefined" }); 92: }); 93: 94: addEvent...(window, 'hashchange', function (event) { 95: reportEvent(event); 96: }); 97: 98: addEvent(window..., 'pageshow', function (event) { 99: reportEvent(event); 100: }); 101: 102: addEvent(window, 'pagehide
window.opera.toString().indexOf('Opera'), addEvent = function (type, callback) {...elem.currHeight = parseInt(style.height); }; }; addEvent...('propertychange', change); addEvent('input', change); addEvent('focus', change);
云服务器
ICP备案
即时通信 IM
对象存储
云直播
