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本文实例讲述了JS实现仿腾讯微博无刷新删除微博效果代码。分享给大家供大家参考。具体如下：
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。
运行效果截图如下：
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 \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() 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">
var get = {
  byId: function(id) {
    return typeof id === "string" &#63; 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 &#63; 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 &#63; 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" &#63; (obj.style["filter"] = "alpha(opacity=" + attr[i] + ")", obj.style[i] = attr[i] / 100) : obj.style[i] = attr[i];
      }
      else
      {  
        return obj.currentStyle &#63; obj.currentStyle[attr] : getComputedStyle(obj, null)[attr]
      }
      break;
    case 3:
      attr == "opacity" &#63; (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 &#63; 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 &#63; 1 : 0.5;
    oMaxNum.innerHTML = Math.abs(maxNum - Math.floor(iLen));  
    maxNum - Math.floor(iLen) >= 0 &#63; (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&#63;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>
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希望本文所述对大家的JavaScript程序设计有所帮助。