<!DOCTYPE html>
<html lang="en">
<head>
 <meta charset="UTF-8">
 <title>微博消息效果</title>
 <style>
 *{margin:0;padding: 0;}
 .warp{
  width: 600px;
  margin:50px auto 0;
  background-color: #ccc;
 }
 #box{
  width: 600px;
  height: 340px;
  /*background-color: #ccc;*/
  position: relative;
  /*overflow: hidden;*/
  /*margin:50px auto 0;*/
  font-family: '微軟雅黑';
 }
 #box .span1{
  position: absolute;
  font-size: 16px;
  line-height: 16px;
  top: 10px;
  left: 5px;
 }
 #box .span2{
  position: absolute;
  font-size: 16px;
  line-height: 16px;
  top: 50px;
  left: 5px;
 }
 #title{
  position: absolute;
  width: 460px;
  height: 20px;
  line-height: 20px;
  font-size: 16px;
  text-indent: 5px;
  left: 70px;
  top: 6px;
 }
 #text{
  position: absolute;
  width: 460px;
  height: 250px;
  resize: none;
  top: 50px;
  left: 70px;
  text-indent: 5px;
  font-size: 16px;
 }
 #box #prompt{
  position: absolute;
  top: 312px;
  left: 340px;
 }
 #prompt1{
  position: absolute;
  top: 312px;
  left: 340px;
  display: none;
 }
 #send{
  position: absolute;
  height: 25px;
  width: 60px;
  line-height: 20px;
  font-size: 16px;
  top: 310px;
  right: 68px;
 }
 #news{
  list-style: none;
  width: 490px;
  margin:10px auto 0px;
  padding-bottom: 5px;
 }
 #news li{
  width: 490px;
  font-size: 14px;
  overflow: hidden;
  background-color: #fff;
  margin-bottom: 5px;
  position: relative;
 }
 #news li h1{
  font-size: 16px;
  line-height: 20px;
 }
 #news li p{
  text-indent: 5px;
  clear: left;
 }
 #news li span{
  position: absolute;
  top: 0px;
  right: 0px;
  cursor: pointer;
 }
 #news span:hover{
  color: red;
 }
 </style>
</head>
<body>
 <div class="warp">
  <div id="box">
   <span class='span1'>標(biāo)題：</span>
   <input id="title" type="text">
   <span class="span2">內(nèi)容：</span>
   <textarea id="text"></textarea>
   <em id="prompt">還可以輸入<var id="textnum">200</var>字</em>
   <em id="prompt1">你已超出<var id="textnum1"></var>字</em>
   <button id="send">發(fā)送</button>
  </div>
  <ul id="news">
    <li><h1></h1><span></span>
      <p></p>
    </li>
   </ul>
 </div>
 <script>
  var title=document.getElementById('title');
  var text=document.getElementById('text');
  var send=document.getElementById('send');
  var ul=document.getElementById('news');
  var lis=ul.getElementsByTagName('li');
  var prompt=document.getElementById('prompt');
  var prompt1=document.getElementById('prompt1');
  var textnum=document.getElementById('textnum');
  var textnum1=document.getElementById('textnum1');
  var timer1=null,timer2=null;
  send.onclick=function(){
   if (text.value==''||title.value=='') {
    alert('親~標(biāo)題或內(nèi)容不能為空');return false;
   }
   lis[0].innerHTML='<h1>'+title.value+'</h1><span>×</span><p>'+text.value+'</p>';
   lis[0].children[1].setAttribute('id','close');
   var newLi=document.createElement('li');
   ul.insertBefore(newLi,lis[0]);
   maxheight=lis[1].clientHeight;
   lis[1].style.height=0+'px';
   var x=0;
   var minstep=0;
   var maxstep=20;
   var change=maxheight/maxstep;
   clearInterval(timer1);
   timer1=setInterval(function(){
    minstep++;
    if (minstep>=maxstep) {
     clearInterval(timer1);
    }
    x+=change;
    lis[1].style.height=x+'px';
   },10)
   title.value='';
   text.value='';
   var close=document.getElementById('close');
    for (var i = 0; i < lis.length; i++) {
     close.onclick=function(){
      var isme=this.parentNode;
      var x=this.parentNode.clientHeight;
     var minstep=0;
     var maxstep=20;
     var change=x/maxstep;
     clearInterval(timer1);
     timer1=setInterval(function(){
      minstep++;
      if (minstep>=maxstep) {
       clearInterval(timer1);
       ul.removeChild(isme);
      }
      x-=change; 
      isme.style.height=x+'px';
     },10)
     // ul.removeChild(lis[i]);//不可以，不知道綁定的是第幾個(gè)。
     }
    }
   }
  text.onfocus=function(){
   // console.log(prompt.children[0].innerHTML);//children是指帶有標(biāo)簽的子節(jié)點(diǎn)；
   timer2=setInterval(function(){
    if(text.value.length<190){
     var num=200-text.value.length;
     textnum.style.color='black';
     // prompt.style.color='black';
     textnum.innerHTML=num;//
     // prompt.innerHTML='還可以輸入<var id="textnum">'+num+'</var>字</em>';
    }
    if (text.value.length>=190&&text.value.length<=200){
     var num=200-text.value.length;
     // prompt.style.color='black';
     textnum.style.color='red';//為什么不變紅呢？因?yàn)檫@他妹的也是一個(gè)未來事件！
     // prompt.innerHTML='還可以輸入<var id="textnum">'+num+'</var>字</em>';
     textnum.innerHTML=num;
    }
    if (text.value.length>200){
     var num=text.value.length-200;
     // prompt.style.color='red';
     prompt.style.display='none';
     prompt1.style.display='block';
     textnum1.style.color='red';
     textnum1.innerHTML=num;
     
    }
    // console.log(text.value.length);
   },50) 

  }
  text.onblur=function(){
   clearInterval(timer2);
  }
 </script>
</body>
</html>

這段代碼主要運(yùn)用了一些DOM節(jié)點(diǎn)操作的知識，純屬學(xué)習(xí)之余練手作品，大家可以參考參考。

以上就是本文的全部內(nèi)容，希望對大家的學(xué)習(xí)有所幫助，也希望大家多多支持腳本之家。

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