abstract：微博字数输入案例<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>微博输入</title> &nb
微博字数输入案例
<!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: 158px;
margin-right:15px;
color: #888;
}
#bt{
float: left;
width: 80px;
height: 30px;
border: none;
background: #ffc09f;
color: #fff;
border-radius: 5px;
}
</style>
</head>
<body>
<div class="box">
<img src="images/12.png">
<div class="box1">还可以输入<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 type="button" value="发布" id="bt">
</div>
<script type="text/javascript">
var text,number,m,bt;
window.onload=function (){
text=document.getElementById('text');
number=document.getElementById('number');
bt=document.getElementById('bt');
text.onkeyup=function aa(){
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("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>
</body>
</html>运行截图
总结：
案例复习了html+css的基础知识
对于一些基础的js代码能自己敲出来，对于一些稍有难度的代码现在也能看懂，再接再厉！
Correcting teacher：天蓬老师Correction time：2019-07-01 17:36:20
Teacher's summary：这已经是最入门的前端脚本了, 只涉及到极少的知识点, 一定要坚持