仿新浪微博代码如下：
<p> 仿新浪微博原生JS效果</p><style _ue_org_tagname="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 \5b8b\4f53;}#msgBox{width:500px;background:#fff;border-radius:5px;margin:10px auto;padding-top:10px;}#msgBox form h2{font-weight:400;font:400 18px/1.5 \5fae\8f6f\96c5\9ed1;}#msgBox form{padding:0 20px 15px;}#userName,#conBox{color:#777;border:1px solid #d0d0d0;border-radius:6px;padding:3px 5px;font:14px/1.5 arial;}#userName.active,#conBox.active{border:1px solid #7abb2c;}#userName{height:20px;}#conBox{width: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{width:30px;height:30px;cursor:pointer;margin-right:6px;opacity:0.5;filter:alpha(opacity=50);}#face img.hover,#face img.current{width:28px;height:28px;border:1px solid #f60;opacity:1;filter:alpha(opacity=100);}#sendBtn{border:0;width:112px;height:30px;cursor:pointer;margin-left:10px;}#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;width: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;width:50px;height:50px;display:inline;margin-left:10px;border:1px solid #ccc;border-radius:3px;}#msgBox .list .userPic img { width:50px; height:50px; }#msgBox .list ul li .content{float:left;width:400px;font-size:14px;margin-left:10px; margin-top:0px; padding:0;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 _ue_org_tagname="script" type="text/javascript">/*-------------------------- + 非拓源原创，此代码源自蓝色理想 获取id, class, tagName +-------------------------- */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("\u8bf7\u586b\u5199\u60a8\u7684\u59d3\u540d");oUserName.focus()}else if(!/^[u4e00-\u9fa5\w]{2,8}$/g.test(oUserName.value)){alert("\u59d3\u540d\u75312-8\u4f4d\u5b57\u6bcd\u3001\u6570\u5b57\u3001\u4e0b\u5212\u7ebf\u3001\u6c49\u5b57\u7ec4\u6210\uff01");oUserName.focus()}else if(reg.test(oConBox.value)){alert("\u968f\u4fbf\u8bf4\u70b9\u4ec0\u4e48\u5427\uff01");oConBox.focus()}else if(!bSend){alert("\u4f60\u8f93\u5165\u7684\u5185\u5bb9\u5df2\u8d85\u51fa\u9650\u5236\uff0c\u8bf7\u68c0\u67e5\uff01");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:;\">\u5220\u9664</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 += /[^\x00-\xff]/g.test(oConBox.value.charAt(i)) ? 1 : 0.5;oMaxNum.innerHTML = Math.abs(maxNum - Math.floor(iLen));maxNum - Math.floor(iLen) >= 0 ? (css(oMaxNum, "color", ""), oCountTxt.innerHTML = "\u8fd8\u80fd\u8f93\u5165", bSend = true) : (css(oMaxNum, "color", "#f60"), oCountTxt.innerHTML = "\u5df2\u8d85\u51fa", 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0function 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><div id="msgBox"> <form 360chrome_form_autofill="2"> <h2> 有什么新鲜事要告诉大家 </h2> <div> <input id="userName" class="f-text"/> <p id="face"> <img style="width:28px;float:none;height:28px" class="current" border="0" hspace="0" src="https://tp2.sinaimg.cn/1787516913/50/1282184635/1" width="28" height="28"/><img style="width:28px;float:none;height:28px" border="0" hspace="0" src="https://tp4.sinaimg.cn/1909869991/180/5661603613/0.jpg" width="28" height="28"/><img style="width:28px;float:none;height:28px" border="0" hspace="0" src="httsp://tp4.sinaimg.cn/2183934131/180/5637370194/0.jpg" width="28" height="28"/><img style="width:28px;float:none;height:28px" border="0" hspace="0" src="https://tp4.sinaimg.cn/2526902503/180/40022263227/1.jpg" width="28" height="28"/><img style="width:28px;float:none;height:28px" border="0" hspace="0" src="https://tp2.sinaimg.cn/1581621517/50/5604025885/0" width="28" height="28"/><img style="width:28px;float:none;height:28px" border="0" hspace="0" src="https://ww2.sinaimg.cn/thumbnail/6a8b57f1jw1dgawxf46hej.jpg" width="28" height="28"/> </p> </div> <div> <textarea id="conBox" class="f-text"></textarea> </div> <div class="tr"> <p> <span class="countTxt">还能输入</span><strong class="maxNum">140</strong>个字<input id="sendBtn" title="快捷键 Ctrl+Enter" type="button"/> </p> </div> </form> <div class="list"> <h3> 大家在说 </h3> <ul class=" list-paddingleft-2"> <li> <div class="userPic"> <img src="https://tp2.sinaimg.cn/1787516913/50/1282184635/1"/> </div> <div class="content"> <div class="userName"> <a href="javascript:;">Toyean</a>: </div> <div class="msgInfo"> 新增删除广播功能。 </div> <div class="times"> 07月05日 15:14<a class="del" href="javascript:;">删除</a> </div> </div> </li> <li> <div class="userPic"> <img src="https://tp2.sinaimg.cn/1787516913/50/1282184635/1"/> </div> <div class="content"> <div class="userName"> <a href="javascript:;">Toyean</a>: </div> <div class="msgInfo"> 新增Ctrl+Enter快捷键发送广播。 </div> <div class="times"> 07月05日 12:20<a class="del" href="javascript:;">删除</a> </div> </div> </li> <li> <div class="userPic"> <img src="https://tp2.sinaimg.cn/1787516913/50/1282184635/1"/> </div> <div class="content"> <div class="userName"> <a href="javascript:;">Toyean</a>: </div> <div class="msgInfo"> 新增选择头像功能。 </div> <div class="times"> 07月05日 12:08<a class="del" href="javascript:;">删除</a> </div> </div> </li> <li> <div class="userPic"> <img src="https://tp2.sinaimg.cn/1787516913/50/1282184635/1"/> </div> <div class="content"> <div class="userName"> <a href="javascript:;">Toyean</a>: </div> <div class="msgInfo"> 增加了记录广播时间的功能。 </div> <div class="times"> 07月04日 16:55<a class="del" href="javascript:;">删除</a> </div> </div> </li> <li> <div class="userPic"> <img src="https://tp2.sinaimg.cn/1787516913/50/1282184635/1"/> </div> <div class="content"> <div class="userName"> <a href="javascript:;">Toyean</a>: </div> <div class="msgInfo"> 增加了输入字符检测功能，英文/半角为半个字符，汉字/全角为一个字符。 </div> <div class="times"> 07月04日 08:30<a class="del" href="javascript:;">删除</a> </div> </div> </li> <li> <div class="userPic"> <img src="https://tp2.sinaimg.cn/1787516913/50/1282184635/1"/> </div> <div class="content"> <div class="userName"> <a href="javascript:;">Toyean</a>: </div> <div class="msgInfo"> 仿腾讯微博效果，欢迎大家测试！ </div> <div class="times"> 07月03日 20:19<a class="del" href="javascript:;">删除</a> </div> </div> </li> </ul> </div></div><!--!doctype-->