abstract：<!DOCTYPE html> <html> <head> <title>微博輸入</title> <style type="text/css"> body{font-size: 12px;} .box{width: 600px;height:
<!DOCTYPE html>
<html>
<head>
<title>微博輸入</title>
<style type="text/css">
body{font-size: 12px;}
.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 #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: 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,wlenth
window.onload=function () {
text=document.getElementById('text')
number=document.getElementById('number')
bt=document.getElementById('bt')
text.onkeyup=function cal() {
wlenth=140-text.value.length //微博的限制字?jǐn)?shù)是140
if(wlenth<0) {
number.style.color="red"
}else{
number.style.color="#888"
}
number.innerHTML=wlenth;
}
bt.onclick=function(){
if(wlenth==140){
alert("您還沒(méi)有輸入")
text.focus()
}else if(wlenth<0){
alert("字?jǐn)?shù)過(guò)多，不可以發(fā)布！")
text.focus()
}else {
alert("發(fā)布成功！")
}
}
cal()
}
</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(kāi)</span>
<input type="button" value="發(fā)布" id="bt">
</div>
</body>
</html>
Correcting teacher：滅絕師太Correction time：2018-12-15 09:30:29
Teacher's summary：可以把 cal() 這個(gè)函數(shù)名去掉，不需要調(diào)用，老師在視頻中多此一舉了，我們用的是匿名函數(shù)，不需要調(diào)用，只執(zhí)行的