abstrakt：<!DOCTYPE html><html><head> <meta charset="utf-8"> <title>微博輸入</title> <style type="text/css"> body{ font-size:
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>微博輸入</title>
<style type="text/css">
body{
font-size: 12px;
}
.box{
width: 600px;
height: 160px;
border:10px solid lightblue;
margin: 0px auto;
padding:10px;
border-radius: 35px;
}
img{
float: left;
}
.box1{
float: left;
margin-left: 255px;
width: 150px;
height: 24px;
text-align: right;
font-size: 14px;
color: #999;
}
.box1 span{
font-size: 16px;
font-weight: bold;
}
#text{
width:600px;
height: 100px;
border: 2px double pink;
margin-top: 5px;
border-radius: 10px;
}
.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: #00bfff;
}
#bt{
float: left;
width: 80px;
height: 30px;
border: none;
background: lightblue;
color: pink;
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=100-text.value.length//微博限制字?jǐn)?shù)是100
if(m<0){
number.style.color="red"
}else{
number.style.color="#888"
}
number.innerHTML=m;
}
bt.onclick=function(){
if (m==100) {
alert("你還沒有輸入")
text.focus()
}else if(m<0){
alert("字?jǐn)?shù)太多，不可以發(fā)布")
text.focus()
}else{
alert("發(fā)布成功")
}
}
aa()
}
</script>
</head>
<body>
<div class="box">
<img src="images/12.png">
<div class="box1">還可以輸入<span id="number"></span>字</div>
<textarea id="text"></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(zhǎng)微博</span>
<span id="sp6">公開</span>
<input type="button" value="發(fā)布" id=" ">
</div>
</body>
</html>
Korrigierender Lehrer：滅絕師太Korrekturzeit：2019-01-04 09:22:20
Zusammenfassung des Lehrers：aa()這個(gè)函數(shù)名可以省略，這是個(gè)匿名函數(shù)可以自調(diào)用