abstrait：<!DOCTYPE html><html><head> <meta charset="utf-8"> <title>微博輸入</title> <style type="text/css"> body{f
<!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 #98E0F9;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 #sp1,#sp2,#sp3,#sp4,#sp5,#sp6{float:left;width:30px;height:32px;line-height:32px;padding-left:26px;}
#sp1{background:url(img/an5.png) no-repeat left center;}
#sp2{background:url(img/an4.png) no-repeat left center;}
#sp3{background:url(img/an3.png) no-repeat left center;}
#sp4{background:url(img/an2.png) no-repeat left center;}
#sp5{background:url(img/an1.png) no-repeat left center;width:40px;}
#sp6{margin-left:150px;margin-right:15px;color:#888;}
#bt{float:left;width:80px;height:30px;border:none;background:#8BB85B;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//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(){
if (m==140) {
alert("您還沒有輸入內(nèi)容！")
text.focus()
}else if(m<0){
alert("您輸入的字?jǐn)?shù)超過限制！")
text.focus()
}else{
alert("微博發(fā)布成功！")
}
}
aa()
}
</script>
</head>
<body>
<div class="box">
<img src="img/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">長微博</span>
<span id="sp6">公開</span>
<input type="button" value="發(fā)布" id="bt" >
</div>
</body>
</html>
Professeur correcteur：滅絕師太Temps de correction：2019-02-19 15:19:36
Résumé du professeur：完成作業(yè)照葫蘆畫瓢沒有什么意義哦!希望你認(rèn)真理解每一條語句的作用