<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>微博输入字数</title>
<link rel="stylesheet" type="text/css" href="">
<style type="text/css">
body{font-size: 12px;}
.box{width: 600px;height: 160px;border: 10px solid pink;margin: 0 auto;padding: 10px;}
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 green;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(static/images/an5.png)no-repeat left center;}
#sp2{background: url(static/images/an4.png)no-repeat left center;}
#sp3{background: url(static/images/an3.png)no-repeat left center;}
#sp4{background: url(static/images/an2.png)no-repeat left center;}
#sp5{background: url(static/images/an1.png)no-repeat left center; width: 40px;}
#sp6{margin-left: 150px;margin-right: 15px;color: #888;}
#btn{float: left;width: 80px;height: 30px;border: none;background: #ffc09f;color: #fff;}
</style>
</head>
<body>
<div class="box">
<img src="static/images/12.png">
<div class="box1">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="btn">
</div>
<script type="text/javascript">
var text,number,m;
window.onload=function(){
text=document.getElementById('text');
number=document.getElementById('number');
btn=document.getElementById('btn');
text.onkeyup=function(){
m=140-text.value.length;
if(m<0){
number.style.color='red';
}else{
number.style.color='#888';
}
number.innerHTML=m;
}
btn.onclick=function(){
if(m==140){
alert('请输入文字');
}else if(m<0){
alert('字数过多，不能发布');
}else{
alert('发布成功');
}
}
}
</script>
</body>
</html>
