手记 / 微博输入数字及其总结

微博输入数字及其总结

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<!DOCTYPE html>
<html>
<head>
         <meta charset="uft-8">
         <title>微博输入数字</title>
         <style type="text/css">
                   body{font-size: 12px;}
                  .box{width: 600px;height: 160px;border: 10px solid pink;margin: 0px auto;padding: 10px;}
                  .box img{float: left;}
                  .box1{float: left;margin-left: 255px;width: 150px;height: 24px;text-align: right;font-size: 14px;color:#888;}
                  .box1 span{font-size: 16px;font-weight: bold;}
                  #text{width: 600px;height: 100px;border: 1px solid blue;margin-top: 5px;}
                  .box #sp1,#sp2,#sp3,#sp4,#sp5,#sp6{float:left; width: 30px;height:32px;line-height: 32px;padding-left: 26px;}
                  #sp1{background:url(images/an5.png) no-repeat left center;}
                  #sp2{background:url(images/an4.png) no-repeat left center;}
                  #sp3{background:url(images/an3.png) no-repeat left center;}
                  #sp4{background:url(images/an2.png) no-repeat left center;}
                  #sp5{background:url(images/an1.png) no-repeat left center;width: 40px;}
                  #sp6{margin-left:150px;margin-right: 15px;color: #888;  }
                  #bu{float: left;width: 80px; height:30px; border: none;background: #ffc09f;color: #fff;border-radius: 5px;}
         </style>
    <script type="text/javascript">
             var number,text,n;
             window.onload=function(){
                     text=document.getElementById('text')
                     number=document.getElementById('number')
                     bu=document.getElementById('bu')
                     text.onkeyup=function aa(){
                              m=140-text.value.length//限制微博字数
                              if(m<0){
                                       number.style.color="red"
                              }else{
                                       number.style.color="#888"
                         }
                        number.innerHTML=m
                     }
                     bu.onclick=function(){
                              if(m==140){
                                       alert("你还没有输入")
                                       text.focus()
                              }else if(m<0) {
                                       alert("字数太多,不可以发布")
                                       text.focus()
                              }else{
                                       alert("发布成功")
                              }
                     }
                     aa()
             }
    </script>
</head>
<body>
         <div>
                  <img src="images/12.png" >
                  <div>还可以输入<span id="number"></span>字</div>
                  <textarea id="text"></textarea>
                  <span id="sp1">表情</span>
                  <span id="sp2">图片</span>
                  <span id="sp3">视频</span>
                  <span id="sp4">话题</span>
                  <span id="sp5">长微博</span>
                  <span id="sp6">公开</span>
                  <input type="button" value="发布" id="bu">
         </div>
</body>
</html>

总结:

html元素的获取

js事件的运用

函数的调用

该案例可以于 文字发布 的实际运用中

相关标签:JavaScript
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