<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>微博输入</title>
<link rel="stylesheet" type="text/css" href="css/wbinput.css">
</head>
<body>
<div>
<img src="images/12.png">
<div>还可以输入<span id="sp0"></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="bt"></input>
</div>
<script type="text/javascript">
var textContent,wordsShow,m,bt
window.onload=function(){
textContent=document.getElementById('text')
wordsShow=document.getElementById('sp0')
bt=document.getElementById('bt')
textContent.onkeyup=function Computer(){
m=140-text.value.length//输入字数限制是140个字
if(m>0)
wordsShow.style.color="#888"
else
wordsShow.style.color="red"
wordsShow.innerHTML=m
}
bt.onclick=function judge(){
if (m==140) {
alert("发布的内容不能为空！")
textContent.focus()//让光标回到输入区域
}
else if(m<0){
alert("超过字数限制，发布失败！")
textContent.focus()
}
else{
alert("发布成功！")
textContent.focus()
}
}
}
</script>
</body>
</html>*{margin: 0px;padding: 0px;}
body{font-size: 12px;}
.box{width: 600px;
height: 160px;
border: 10px solid pink;
margin: 0px auto;
padding: 10px;}
img{float: left;}
.words{float: left;
margin-left: 255px;
width: 150px;
height: 24px;
text-align: right;
font-size: 14px;
color: #888;}
#sp0{font-size: 16px;font-weight: bold;}
#text{width: 600px;
height: 100px;
border: 1px solid #ccc;
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(F:/SublimeText3/project/微博输入字数/images/an5.png) no-repeat left center;}
#sp2{background: url(F:/SublimeText3/project/微博输入字数/images/an4.png) no-repeat left center;}
#sp3{background: url(F:/SublimeText3/project/微博输入字数/images/an3.png) no-repeat left center;}
#sp4{background: url(F:/SublimeText3/project/微博输入字数/images/an2.png) no-repeat left center;}
#sp5{background: url(F:/SublimeText3/project/微博输入字数/images/an1.png) no-repeat left center;width: 40px;}
#sp6{margin:0px 5px 0px 150px;color: #888;}
#bt{float: left;
width: 80px;
height: 30px;
border: none;
border-radius: 5px;
background: #ffc09f;
color: #fff;}
