微博输入-2作业
<!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:10px solid pink; margin:0px 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 #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(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;}
#bt{float:left;width:80px;height:30px;border:none;background:#ffc09f;color:#fff;border-radius: 5px;}
</style>
<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 aa(){
m=140-text.value.length//微博限制字数140
if(m<0){
number.style.color="red"
}else{
number.style.color="888"
}
number.innerHTML=m
}
bt.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")
}
}
}
</script>
</head>
<body>
<div class="box">
<img src="images/12.png">
<div class="box1">还可以输入<span id='number'>字</span></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">
</div>
</body>
</html>