摘要：<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xml
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en">
<head>
<meta http-equiv="Content-Type" content="text/html;charset=UTF-8" />
<title>小案例微博输入By Johnson</title>
<style type="text/css" media="screen">
*{margin:0;padding:0;font-size: 12px;}
.wraper{margin:100px auto;width:600px;height:160px;border:10px solid pink;padding: 10px;}
.wraper #hd{display: none;float:right;color: #888;font-size: 14px;}
.wraper #number{color: #808080;font-weight: bold}
.wraper #hd1{display: inline-block;float:right;color:#eb7350;font-size: 12px;}
.wraper #text{width: 600px;height: 100px;border: 1px solid #ccc;margin: 5px 0;}
.wraper #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>
<script type="text/javascript" charset="utf-8">
var text,number, m,hd1,hd
window.onload=function (){
text=document.getElementById('text')
number=document.getElementById('number')
bt=document.getElementById('bt')
hd=document.getElementById('hd')
hd1=document.getElementById('hd1')
text.onfocus=function(){
hd1.style.display="none"
hd.style.display="inline-block"
text.style.borderColor="#fa7d3c";
text.style.outline="none";
}
text.onblur=function(){
hd1.style.display="inline-block"
hd.style.display="none"
text.style.borderColor="#ccc";
}
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("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")
}
}
// aa();
}
</script>
</head>
<body>
<div class="wraper">
<img src="images/12.png" alt="微博">
<div id="hd">还可以输入<span id="number">140</span>字</div>
<div id="hd1">印尼狮航一架客机坠毁，机上载有188人>>详情 热门微博</div>
<div style="clear: both"></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>
