摘要：<!DOCTYPE html><html><head><meta charset="UTF-8"><title>微博输入框</title><style type="text/css">body{font-size: 12px;}.box{width: 600px;height
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>微博输入框</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 #888;margin-top: 5px;}
.box #sp1,#sp2,#sp3,#sp4,#sp5,#sp6{float: left;width: 32px;line-height: 32px;padding-left: 26px;}
#sp1{background: url() no-repeat left center;}
#sp2{background: url() no-repeat left center;}
#sp3{background: url() no-repeat left center;}
#sp4{background: url() no-repeat left center;}
#sp5{background: url() no-repeat left center;width: 40px;}
#sp6{margin-left: 16px;margin-right: 15px;color: #888;}
#bt{float: left;width:50px;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.getElenmentById('text')
number=document.getElenmentById('number')
bt=document.getElenmentById('bt')
text.onkeyup=function aa(){
m=140-text.value.length//微博限制140个字
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("字数太多，不可以发布")
text.focus()
}else{
alert("发布成功")
}
}
aa()
}
</script>
</head>
<body>
<div>
<img src="">
<div>还可以输入<span id="number"></span>文字</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="botton" value="发布" id="bt">
</div>
</body>
</html>
批改老师：灭绝师太批改时间：2019-01-06 13:43:15
老师总结：案例还可以完善，aa（）这个函数名可以去掉，匿名函数不需要调用奥，可以省略
