微博发布的js判断
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Document</title>
<style type="text/css">
.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;}
.box1 span{font-size: 16px;font-weight: bold;}
#text{width: 600px;height: 100px;border: 1px solid #888;margin-top:5px;}
.box #span1,#span2,#span3,#span4,#span5{
float: left; height: 32px;line-height: 30px;padding-left: 26px;
}
#span1{background: url(images/an5.png) no-repeat left center;}
#span2{background: url(images/an4.png) no-repeat left center;}
#span3{background: url(images/an3.png) no-repeat left center;}
#span4{background: url(images/an2.png) no-repeat left center;}
#span5{background: url(images/an1.png) no-repeat left center;}
#span6{margin-left: 140px;margin-right: 15px;color: #888; }
#bt{width: 80px;height: 30px;border: none;background: #ffc09f; color: #fff;border-radius: 8px;}
</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('您还没有输入');
text.focus();
}else if(m<0){
alert('字数过多');
text.focus();
}else{
alert('发布成功');
}
}
aa();
}
</script>
</head>
<body>
<div>
<img src="images/12.png">
<div>还可以输入<span id="number"></span></div>
<textarea id="text"></textarea>
<span id="span1">表情</span>
<span id="span2">图片</span>
<span id="span3">视频</span>
<span id="span4">话题</span>
<span id="span5">长微博</span>
<span id="span6">公开</span>
<input type="button" value="发布" id="bt" con>
</div>
</body>
</html>