abstrak：<!DOCTYPE html><html><head><meta charset="UTF-8"><title>微博輸入</title><style type="text/css">.box{width: 600px;height: 160px;border: 10px so
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>微博輸入</title>
<style type="text/css">
.box{width: 600px;height: 160px;border: 10px solid pink;margin: 0px auto;padding:10px;}
img{float: left;}
.box1{
float: right;
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 #sp1,#sp2,#sp3,#sp4,#sp5,#sp6{float: left;width: 30px;height: 32px;line-height: 32px;padding-left: 26px;font-size: 12px;}
#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:160px; }
#bt{float: right;width: 80px;height: 30px;border: none;background: #ffc09f;color: #fff;border-radius: 5px;}
</style>
</head>
<body>
<div>
<img src="images/12.png" alt="">
<div>還可以輸入<span id="number"></span>字</div>
<textarea name="" id="text" cols="30" rows="10"></textarea>
<span id="sp1">表情</span>
<span id="sp2">圖片</span>
<span id="sp3">視頻</span>
<span id="sp4">話題</span>
<span id="sp5">長微博</span>
<span id="sp6">公開</span>
<input type="button" id="bt" value="發(fā)布" onclick="bb()">
</div>
<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?jǐn)?shù)是140
if(m<0){
number.style.color='red'
}else{
number.style.color='#888'
}
number.innerHTML=m
}
bt.onclick=function bb(){
if(m==140){
alert('文字不能不為空')
text.focus() //彈框彈出確認(rèn)后。自動(dòng)落入輸入框獲得焦點(diǎn)
}else if(m<0){
alert('超過輸出字')
}else{
alert('發(fā)送成功！')
}
}
}
</script>
</body>
</html>
Guru membetulkan：西門大官人Masa pembetulan：2019-04-04 17:40:53
Rumusan guru：注意一下函數(shù)的命名，盡量避免出現(xiàn)aa,bb這樣無意義的函數(shù)名稱