摘要：<!DOCTYPE html><html><head> <meta charset="utf-8"> <title>微博输入</title> <style type="text/css"> body{ &nbs
<!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:8px 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;
}
.box 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;
height: 32px;
line-height: 32px;
padding-left:26px;
width:32px;
}
#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:50px;
}
#sp6{
margin-left: 139px;
margin-right:15px;
color:#888;
}
#bt{
float:left;
width:80px;
height:30px;
border:none;
background:#ffc09f;
border-radius:5px;
text-align: center;
}
</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//微博限制字数是140
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("字数过多，不能发布")
text.focus()
}else{
alert("发布成功")
}
}
aa()
}
</script>
</head>
<body>
<div class="box">
<img src="images/12.png">
<div class="box1">还可输入<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 tyoe="button" value="发布" id="bt">
</div>
</body>
</html>
批改老师：灭绝师太批改时间：2018-11-16 11:21:43
老师总结：光靠老师讲的案例，不可以奥，自己找点案例完成，不会就问
