仿腾讯微博效果（原生JS）代码,JS代码库,德仔网

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【JS】仿腾讯微博效果（原生JS）
作者:Ferris / 发布于2013/6/13/ 904
http://js.fgm.cc/learn/lesson6/02.html

	<!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>
	<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
	<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 \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{background:url(img/boxBG.jpg) 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{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;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;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 .content{float:left;width: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">
	/*-------------------------- +
	 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(/<[^>]*>|&nbsp;/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 += 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 = "\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="img/face1.gif" class="current" /><img src="img/face2.gif" /><img src="img/face3.gif" /><img src="img/face4.gif" /><img src="img/face5.gif" /><img src="img/face6.gif" /><img src="img/face7.gif" /><img src="img/face8.gif" />
	 </div>
	 <div><textarea id="conBox" class="f-text"></textarea></div>
	 <div class="tr">
	 
	 <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" />
	 
	 </div>
	 </form>
	 <div class="list">
	 <h3><span>大家在说</span></h3>
	 <ul>
	 <li>
	 <div class="userPic"><img src="img/face.gif" /></div>
	 <div class="content">
	 <div class="userName"><a href="javascript:;">日丶久生情</a>:</div>
	 <div class="msgInfo">新增删除广播功能。</div>
	 <div class="times"><span>07月05日 15:14</span><a class="del" href="javascript:;">删除</a></div>
	 </div>
	 </li>
	 <li>
	 <div class="userPic"><img src="img/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="img/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="img/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>
	 <li>
	 <div class="userPic"><img src="img/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"><span>07月04日 08:30</span><a class="del" href="javascript:;">删除</a></div>
	 </div>
	 </li>
	 <li>
	 <div class="userPic"><img src="img/face.gif" /></div>
	 <div class="content">
	 <div class="userName"><a href="javascript:;">日丶久生情</a>:</div>
	 <div class="msgInfo">仿腾讯微博效果，欢迎大家测试！</div>
	 <div class="times"><span>07月03日 20:19</span><a class="del" href="javascript:;">删除</a></div>
	 </div>
	 </li>
	 </ul>
	 </div>
	</div>
	</body>
	</html>
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