这里演示JS仿腾讯微博无刷新删除效果，将显示在微博列表里的内容删除，运用AJAX技术，无刷新删除微博的内容，参考性强，希望对初学AJAX的朋友有所帮助。
在线演示地址如下：
http://demo.jb51.net/js/2015/js-f-sina-web-ajax-del-info-demo/
具体代码如下：
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <title>仿腾讯微博效果</title> <style type="text/css"> body,div,h2,h3,ul,li,p{margin:0;padding:0;} a{text-decoration:none;} a:hover{text-decoration:underline;} ul{list-style-type:none;} body{color:#333;background:#3c3a3b;font:12px/1.5 5b8b4f53;} #msgBox{500px;background:#fff;border-radius:5px;margin:10px auto;padding-top:10px;} #msgBox form h2{font-weight:400;font:400 18px/1.5 5fae8f6f96c59ed1;} #msgBox form{background:url() repeat-x 0 bottom;padding:0 20px 15px;} #userName,#conBox{color:#777;border:1px solid #d0d0d0;border-radius:6px;background:#fff url(img/inputBG.png) repeat-x;padding:3px 5px;font:14px/1.5 arial;} #userName.active,#conBox.active{border:1px solid #7abb2c;} #userName{height:20px;} #conBox{448px;resize:none;height:65px;overflow:auto;} #msgBox form div{position:relative;color:#999;margin-top:10px;} #msgBox img{border-radius:3px;} #face{position:absolute;top:0;left:172px;} #face img{30px;height:30px;cursor:pointer;margin-right:6px;opacity:0.5;filter:alpha(opacity=50);} #face img.hover,#face img.current{28px;height:28px;border:1px solid #f60;opacity:1;filter:alpha(opacity=100);} #sendBtn{border:0;112px;height:30px;cursor:pointer;margin-left:10px;background:url(img/btn.png) no-repeat;} #sendBtn.hover{background-position:0 -30px;} #msgBox form .maxNum{font:26px/30px Georgia, Tahoma, Arial;padding:0 5px;} #msgBox .list{padding:10px;} #msgBox .list h3{position:relative;height:33px;font-size:14px;font-weight:400;background:#e3eaec;border:1px solid #dee4e7;} #msgBox .list h3 span{position:absolute;left:6px;top:6px;background:#fff;line-height:28px;display:inline-block;padding:0 15px;} #msgBox .list ul{overflow:hidden;zoom:1;} #msgBox .list ul li{float:left;clear:both;100%;border-bottom:1px dashed #d8d8d8;padding:10px 0;background:#fff;overflow:hidden;} #msgBox .list ul li.hover{background:#f5f5f5;} #msgBox .list .userPic{float:left;50px;height:50px;display:inline;margin-left:10px;border:1px solid #ccc;border-radius:3px;} #msgBox .list .content{float:left;400px;font-size:14px;margin-left:10px;font-family:arial;word-wrap:break-word;} #msgBox .list .userName{display:inline;padding-right:5px;} #msgBox .list .userName a{color:#2b4a78;} #msgBox .list .msgInfo{display:inline;word-wrap:break-word;} #msgBox .list .times{color:#889db6;font:12px/18px arial;margin-top:5px;overflow:hidden;zoom:1;} #msgBox .list .times span{float:left;} #msgBox .list .times a{float:right;color:#889db6;display:none;} .tr{overflow:hidden;zoom:1;} .tr p{float:right;line-height:30px;} .tr *{float:left;} </style> <script type="text/javascript"> var get = { byId: function(id) { return typeof id === "string" ? document.getElementById(id) : id }, byClass: function(sClass, oParent) { var aClass = []; var reClass = new RegExp("(^| )" + sClass + "( |$)"); var aElem = this.byTagName("*", oParent); for (var i = 0; i < aElem.length; i++) reClass.test(aElem[i].className) && aClass.push(aElem[i]); return aClass }, byTagName: function(elem, obj) { return (obj || document).getElementsByTagName(elem) } }; /*-------------------------- + 事件绑定, 删除 +-------------------------- */ var EventUtil = { addHandler: function (oElement, sEvent, fnHandler) { oElement.addEventListener ? oElement.addEventListener(sEvent, fnHandler, false) : (oElement["_" + sEvent + fnHandler] = fnHandler, oElement[sEvent + fnHandler] = function () {oElement["_" + sEvent + fnHandler]()}, oElement.attachEvent("on" + sEvent, oElement[sEvent + fnHandler])) }, removeHandler: function (oElement, sEvent, fnHandler) { oElement.removeEventListener ? oElement.removeEventListener(sEvent, fnHandler, false) : oElement.detachEvent("on" + sEvent, oElement[sEvent + fnHandler]) }, addLoadHandler: function (fnHandler) { this.addHandler(window, "load", fnHandler) } }; /*-------------------------- + 设置css样式 读取css样式 +-------------------------- */ function css(obj, attr, value) { switch (arguments.length) { case 2: if(typeof arguments[1] == "object") { for (var i in attr) i == "opacity" ? (obj.style["filter"] = "alpha(opacity=" + attr[i] + ")", obj.style[i] = attr[i] / 100) : obj.style[i] = attr[i]; } else { return obj.currentStyle ? obj.currentStyle[attr] : getComputedStyle(obj, null)[attr] } break; case 3: attr == "opacity" ? (obj.style["filter"] = "alpha(opacity=" + value + ")", obj.style[attr] = value / 100) : obj.style[attr] = value; break; } }; EventUtil.addLoadHandler(function () { var oMsgBox = get.byId("msgBox"); var oUserName = get.byId("userName"); var oConBox = get.byId("conBox"); var oSendBtn = get.byId("sendBtn"); var oMaxNum = get.byClass("maxNum")[0]; var oCountTxt = get.byClass("countTxt")[0]; var oList = get.byClass("list")[0]; var oUl = get.byTagName("ul", oList)[0]; var aLi = get.byTagName("li", oList); var aFtxt = get.byClass("f-text", oMsgBox); var aImg = get.byTagName("img", get.byId("face")); var bSend = false; var timer = null; var oTmp = ""; var i = 0; var maxNum = 140; //禁止表单提交 EventUtil.addHandler(get.byTagName("form", oMsgBox)[0], "submit", function () {return false}); //为广播按钮绑定发送事件 EventUtil.addHandler(oSendBtn, "click", fnSend); //为Ctrl+Enter快捷键绑定发送事件 EventUtil.addHandler(document, "keyup", function(event) { var event = event || window.event; event.ctrlKey && event.keyCode == 13 && fnSend() }); //发送广播函数 function fnSend () { var reg = /^s*$/g; if(reg.test(oUserName.value)) { alert("u8bf7u586bu5199u60a8u7684u59d3u540d"); oUserName.focus() } else if(!/^[u4e00-u9fa5w]{2,8}$/g.test(oUserName.value)) { alert("u59d3u540du75312-8u4f4du5b57u6bcdu3001u6570u5b57u3001u4e0bu5212u7ebfu3001u6c49u5b57u7ec4u6210uff01"); oUserName.focus() } else if(reg.test(oConBox.value)) { alert("u968fu4fbfu8bf4u70b9u4ec0u4e48u5427uff01"); oConBox.focus() } else if(!bSend) { alert("u4f60u8f93u5165u7684u5185u5bb9u5df2u8d85u51fau9650u5236uff0cu8bf7u68c0u67e5uff01"); oConBox.focus() } else { var oLi = document.createElement("li"); var oDate = new Date(); oLi.innerHTML = "<div class="userPic"><img src="" + get.byClass("current", get.byId("face"))[0].src + ""></div> <div class="content"> <div class="userName"><a href="javascript:;">" + oUserName.value + "</a>:</div> <div class="msgInfo">" + oConBox.value.replace(/<[^>]*>| /ig, "") + "</div> <div class="times"><span>" + format(oDate.getMonth() + 1) + "u6708" + format(oDate.getDate()) + "u65e5 " + format(oDate.getHours()) + ":" + format(oDate.getMinutes()) + "</span><a class="del" href="javascript:;">u5220u9664</a></div> </div>"; //插入元素 aLi.length ? oUl.insertBefore(oLi, aLi[0]) : oUl.appendChild(oLi); //重置表单 get.byTagName("form", oMsgBox)[0].reset(); for (i = 0; i < aImg.length; i++) aImg[i].className = ""; aImg[0].className = "current"; //将元素高度保存 var iHeight = oLi.clientHeight - parseFloat(css(oLi, "paddingTop")) - parseFloat(css(oLi, "paddingBottom")); var alpah = count = 0; css(oLi, {"opacity" : "0", "height" : "0"}); timer = setInterval(function () { css(oLi, {"display" : "block", "opacity" : "0", "height" : (count += 8) + "px"}); if (count > iHeight) { clearInterval(timer); css(oLi, "height", iHeight + "px"); timer = setInterval(function () { css(oLi, "opacity", (alpah += 10)); alpah > 100 && (clearInterval(timer), css(oLi, "opacity", 100)) },30) } },30); //调用鼠标划过/离开样式 liHover(); //调用删除函数 delLi() } }; //事件绑定, 判断字符输入 EventUtil.addHandler(oConBox, "keyup", confine); EventUtil.addHandler(oConBox, "focus", confine); EventUtil.addHandler(oConBox, "change", confine); //输入字符限制 function confine () { var iLen = 0; for (i = 0; i < oConBox.value.length; i++) iLen += oConBox.value.charAt(i).charCodeAt() > 255 ? 1 : 0.5; oMaxNum.innerHTML = Math.abs(maxNum - Math.floor(iLen)); maxNum - Math.floor(iLen) >= 0 ? (css(oMaxNum, "color", ""), oCountTxt.innerHTML = "u8fd8u80fdu8f93u5165", bSend = true) : (css(oMaxNum, "color", "#f60"), oCountTxt.innerHTML = "u5df2u8d85u51fa", bSend = false) } //加载即调用 confine(); //广播按钮鼠标划过样式 EventUtil.addHandler(oSendBtn, "mouseover", function () {this.className = "hover"}); //广播按钮鼠标离开样式 EventUtil.addHandler(oSendBtn, "mouseout", function () {this.className = ""}); //li鼠标划过/离开处理函数 function liHover() { for (i = 0; i < aLi.length; i++) { //li鼠标划过样式 EventUtil.addHandler(aLi[i], "mouseover", function (event) { this.className = "hover"; oTmp = get.byClass("times", this)[0]; var aA = get.byTagName("a", oTmp); if (!aA.length) { var oA = document.createElement("a"); oA.innerHTML = "删除"; oA.className = "del"; oA.href = "javascript:;"; oTmp.appendChild(oA) } else { aA[0].style.display = "block"; } }); //li鼠标离开样式 EventUtil.addHandler(aLi[i], "mouseout", function () { this.className = ""; var oA = get.byTagName("a", get.byClass("times", this)[0])[0]; oA.style.display = "none" }) } } liHover(); //删除功能 function delLi() { var aA = get.byClass("del", oUl); for (i = 0; i < aA.length; i++) { aA[i].onclick = function () { var oParent = this.parentNode.parentNode.parentNode; var alpha = 100; var iHeight = oParent.offsetHeight; timer = setInterval(function () { css(oParent, "opacity", (alpha -= 10)); if (alpha < 0) { clearInterval(timer); timer = setInterval(function () { iHeight -= 10; iHeight < 0 && (iHeight = 0); css(oParent, "height", iHeight + "px"); iHeight == 0 && (clearInterval(timer), oUl.removeChild(oParent)) },30) } },30); this.onclick = null } } } delLi(); //输入框获取焦点时样式 for (i = 0; i < aFtxt.length; i++) { EventUtil.addHandler(aFtxt[i], "focus", function () {this.className = "active"}); EventUtil.addHandler(aFtxt[i], "blur", function () {this.className = ""}) } //格式化时间, 如果为一位数时补0 function format(str) { return str.toString().replace(/^(d)$/,"0$1") } //头像 for (i = 0; i < aImg.length; i++) { aImg[i].onmouseover = function () { this.className += " hover" }; aImg[i].onmouseout = function () { this.className = this.className.replace(/s?hover/,"") }; aImg[i].onclick = function () { for (i = 0; i < aImg.length; i++) aImg[i].className = ""; this.className = "current" } } }); </script> </head> <body> <div id="msgBox"> <form> <h2>来 , 说说你在做什么 , 想什么</h2> <div> <input id="userName" class="f-text" value="" /> <p id="face"><img src="images/face1.gif" class="current" /><img src="images/face2.gif" /><img src="images/face1.gif" /><img src="images/face2.gif" /></p> </div> <div><input id="conBox" class="f-text"></div> <div class="tr"> <p> <span class="countTxt">还能输入</span><strong class="maxNum">140</strong><span>个字</span> <input id="sendBtn" type="button" value="" title="快捷键 Ctrl+Enter" /> </p> </div> </form> <div class="list"> <h3><span>大家在说</span></h3> <ul> <li> <div class="userPic"><img src="images/face.gif" /></div> <div class="content"> <div class="userName"><a href="javascript:;">日丶久生情</a>:</div> <div class="msgInfo">新增Ctrl+Enter快捷键发送广播。</div> <div class="times"><span>07月05日 12:20</span><a class="del" href="javascript:;">删除</a></div> </div> </li> <li> <div class="userPic"><img src="images/face.gif" /></div> <div class="content"> <div class="userName"><a href="javascript:;">日丶久生情</a>:</div> <div class="msgInfo">新增选择头像功能。</div> <div class="times"><span>07月05日 12:08</span><a class="del" href="javascript:;">删除</a></div> </div> </li> <li> <div class="userPic"><img src="images/face.gif" /></div> <div class="content"> <div class="userName"><a href="javascript:;">日丶久生情</a>:</div> <div class="msgInfo">增加了记录广播时间的功能。</div> <div class="times"><span>07月04日 16:55</span><a class="del" href="javascript:;">删除</a></div> </div> </li> </ul> </div> </div> </body> </html>
出处： https://www.jb51.net/article/73484.htm
笔记：
* 在事件绑定中用了一句 (oElement["_" + sEvent + fnHandler] = fnHandler, oElement[sEvent + fnHandler] = function () {oElement["_" + sEvent + fnHandler]()}, oElement.attachEvent("on" + sEvent, oElement[sEvent + fnHandler]))
排列开是 （ oElement["_" + sEvent + fnHandler] = fnHandler,
oElement[sEvent + fnHandler] = function () {oElement["_" + sEvent + fnHandler]()},
oElement.attachEvent("on" + sEvent, oElement[sEvent + fnHandler])
)
在上一篇中，这一句是 oElement.attachEvent("on" + sEvent, fnHandler)
不明白为什么要化简为繁，如果不考虑数组在别的地方会使用的话，上面的代码可以简化为：
oElement.attachEvent("on" + sEvent, function () {fnHandler()}) 这样貌似与上篇并无一二呀
试实了一下，结果一样
var fnHan = function(){console.log(123)} function logg(f){f();} logg(fnHan); //123 logg(function(){fnHan();}); //123