JavaScript+css 案例制作微博输入字数
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>微博输入字数案例</title>
<style type="text/css">
body{
font-size: 12px;
}
.box{
width: 600px;
height: 160px;
border:8px solid red;margin: 0 auto;
padding: 10px;
}
.box1{
float: left;
margin-left: 360px;
width: 150px;
height: 25px;
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: 30px;
height: 32px;
line-height: 32px;
padding-left: 25px;
}
#sp5{
width: 36px;
}
#sp6{
margin-left: 160px;
margin-right: 15px;
}
#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
if(m<0){
number.style.color="red"
}else{
number.style.color="#888"
}
number.innerHTML=m
}
bt.onclick=function(){
if(m==140){
alert("请输入内容...");
text.focus()
}else if(m<0){
alert("字数太多，请输入140字符以内")
text.focus()
}else{
alert("发布成功！")
}
}
aa()
}
</script>
</head>
<body>
<div class="box">
<img src="">
<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>
</body>
</html>总结：布局时善用margin和padding达到一定的效果。