js编写简单的聊天室功能

这个聊天室写的特别简易，比较适合刚开始学习js的同学借鉴，当然，写的不好，也希望诸位大神可以进行批评改正。

聊天室要求：

1.不能发空消息
2.敏感字***显示
3.图片替换 开心，尴尬
4.显示聊天内容和时间
5.每发一条信息，随机显示名称，先把一些名称定义到array里面

<!DOCTYPE html>
<html>
 <head>
  <meta charset="UTF-8">
  <title></title>
  <style type="text/css">
   *{
    box-sizing: border-box;
   }
   .left{
    float: left;
    width: 20%;
    height: 650px;
    color: red;
    border: 1px solid red;
    border-right: 20px solid cornflowerblue;
   }
   .center{
    position: relative;
    float: left;
    width: 60%;
    height: 650px;
    border: 1px solid darkcyan;
   }
   .chatList{
    width: 100%;
    height: 500px;
    overflow-y: scroll;
   }
   .bottom{
    position: absolute;
    width: 100%;
    height: 150px;
    left: 0;
    bottom: 0;
    background: skyblue;
   }
   .bottom textarea{
    width: 70%;
    height: 100%;
    font-size: 18px;;
    vertical-align: middle;
    border: 1px solid red;
    background: blanchedalmond;
   }
   .bottom input{
    width: 80px;
    height: 40px;
    margin-left: 30px;
   }
   .right{
    float: right;
    color: #000000;
    border-right: 0;
    border-left: 20px solid cornflowerblue;
   }
  </style>
 </head>
 <body onload="loadTime()">
  <div class="left" id="left"> 

  </div>
  <div class="center" id="center">
   <div class="chatList" id="chatList"> 

   </div>
   <div class="bottom">
    <textarea id="content" name="content" ></textarea>
    <input type="button" name="send" id="send" value="点击发送" onclick="sendMessage()" />
   </div>
  </div>
  <div class="left right">
   <p>1.不能发空消息</p>
   <p>2.敏感字***显示</p>
   <p>3.图片替换 开心，尴尬</p>
   <p>4.显示聊天内容和时间</p>
   <p>5.每发一条信息，随机显示名称，先把一些名称定义到array里面</p>
  </div> 

 </body>
 <script type="text/javascript">
//  document.getElementById("chatList").scrollHeight;
 /*
   添加敏感字替换成**---8.10
  * */
  function loadTime(){
   var time = new Date(); 

   var hours = (time.getHours()).toString();
   if(hours.length < 2){
    hours = "0" + hours;
   }
   var minutes = (time.getMinutes()).toString();
   if(minutes.length < 2){
    minutes = "0" + minutes;
   }
   var seconds = (time.getSeconds()).toString();
   if(seconds.length < 2){
    seconds = "0" + seconds;
   }
   var timeReturn = hours + ":" + minutes + ":" + seconds;
   document.getElementById("left").innerHTML = timeReturn;
   return timeReturn;
  }
  setInterval("loadTime()",1000);
  var chatContents = "";
  var count = 0;
  function sendMessage(){
   //通过调用randomName()函数来得到一个随机的名字
   var name = randomName();
   //通过调用randomColor()函数来得到一个随机的颜色
   var colorR = randomColor();
   //得到textarea中的内容
   var content = document.getElementById("content").value;
   //判断输入内容是否为空
   if (content == "") {
    alert("输入内容不能为空！！！");
    return;
   }
   //通过正则表达式来获取要替换的字符串
   var regExp = /藏独|台独|傻逼|你大爷/g;
   var regExp1 = /开心/g;
   var regExp2 = /尴尬/g;
//   var imgReplace = content.replace(regExp,"高兴");
   //获取开心图片路径
   var path1 = '<img src="img/chui.png"/>';
   //获取尴尬图片的路径
   var path2 = '<img src="img/mouse.png"/>';
   //敏感字替换；
   content = content.replace(regExp,"***");
   //将开心替换成开心图片的字符串；
//   txtReplace(content);
   var imgReplace = content.replace(regExp1,path1);
//   alert(imgReplace);
   //将尴尬替换成尴尬图片的字符串；
   imgReplace = imgReplace.replace(regExp2,path2);
//   alert(imgReplace);
   var chatContent = "<span>"+ name + ":" + "</span>" + " " + imgReplace;
//   字符串拼接聊天记录
   chatContents =chatContents + chatContent + " " + loadTime() +"<br/>";
   document.getElementById("chatList").innerHTML = chatContents;
   //点击发送后，textarea中的内容设为空
   document.getElementById("content").value = "";
   var txtColor = document.getElementsByTagName("span")[count];
   count++;
   //设置span的随机颜色
   txtColor.style.color = colorR;
  }
  function randomName(){
   var i = parseInt(Math.random() * (6 - 0 + 1) + 0);
   var arrName = new Array("果果","六六","格格","明明","小花","兰兰","花花");
   return arrName[i];
  }
  function randomColor(){
   var r = parseInt(Math.random() * (255 - 0 + 1) + 0).toString(16);
   if(r.length < 2){
    r = "0" + r;
   }
   var g = parseInt(Math.random() * (255 - 0 + 1) + 0).toString(16);
   if(g.length < 2){
    g = "0" + g;
   }
   var b = parseInt(Math.random() * (255 - 0 + 1) + 0).toString(16);
   if(b.length < 2){
    b = "0" + b;
   }
   return "#" + r + g + b;
  } 

 </script>
</html>

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