摘要：<!DOCTYPE html><html><head> <meta charset="utf-8"> <title>微博輸入字?jǐn)?shù)</title> <style type="text/css"> body{font-size: 12px;}
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>微博輸入字?jǐn)?shù)</title>
<style type="text/css">
body{font-size: 12px;}
.box{width: 600px;height: 160px;border: 10px 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 #ccc;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() no-repeat left center;}
#sp2{background: url() no-repeat left center;}
#sp3{background: url() no-repeat left center;}
#sp4{background: url() no-repeat left center;}
#sp5{background: url() 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: #ffc09f;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
if(m<0){
number.style.color="red"
}else{
number.style.color="#888"
}
number.innerHTML=m
}
bt.onclick=function() {
if (m==140) {
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="">
<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>
批改老師：滅絕師太批改時(shí)間：2019-02-18 09:26:05
老師總結(jié)：代碼和老師的代碼沒啥差別,老師的代碼有個(gè)毛病也,沒有發(fā)現(xiàn),aa()這個(gè)函數(shù)可以刪掉,調(diào)用aa()會(huì)報(bào)錯(cuò)哦!學(xué)習(xí)主要是學(xué)習(xí)思路,下次遇到相同問題會(huì)解決,你重寫一遍老師代碼 沒有什么意義