abstract：<!DOCTYPE html><html> <head> <meta charset="utf-8"> <title>微博输入</title> &n
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>微博输入</title>
<style type="text/css">
body{font-size:12px;}
.box{width:600px;height:160px;border:5px solid pink;margin:10px auto;padding:10px;}
img{float:left;}
.box1{float:left;margin-left:255px;width:150px;height:23px;text-align:right; font-size:14px;color:#878;}
.box1 span{font-size: 16px;font-weight:bold;}
#text{width:600px;height:100px;border:1px solid #888;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/xl.png) no-repeat left center;}
#sp2{background: url(images/tp.png) no-repeat left center;}
#sp3{background: url(images/sp.png) no-repeat left center;}
#sp4{background: url(images/ht.png) no-repeat left center;}
#sp5{background: url(images/tt.png) no-repeat left center;width:40px;}
#sp6{margin-left:150px; margin-right:15px; color: #888;}
#bt{float: left;width: 80px;height: 28px; border: none;background:#ffc09f; color:#fff;border-radius:5px;}
</style>
</head>
<body>
<div>
<img src="images/ysm.png" alt="">
<div>还可以输入<span id="number"></span>字</div>
<textarea id="text" name=""></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 id="bt" type="button" value="发布">
</div>
</body>
<script type="text/javascript">
var text,number,m;
window.onload = function(){
text = document.getElementById('text');
number = document.getElementById('number');
bt = document.getElementById('bt');
text.onkeyup = function check(){
m = 140 - text.value.length;
if(m<0){
number.style.color = 'red';
}else{
number.style.color = '#888';
}
number.innerHTML = m;
}
bt.onclick = function(){
if(m == 140){
alert('您还没有输入');
text.focus();
}else if(m < 0){
alert('您输入内容过长，不可以发布');
text.focus();
}else{
alert('发布成功');
}
}
}
</script>
</html>
Correcting teacher：天蓬老师Correction time：2019-05-28 15:58:17
Teacher's summary：尽管微博早已不再限制字数了, 但这仍是一个不错的小练习