abstract：<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>微博輸入</title> <style> body {font-size: 12px;} .box {width:
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>微博輸入</title>
<style>
body {font-size: 12px;}
.box {width: 600px;height: 160px;border: 10px solid pink;margin: 0 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-color: #ffc09f;color: #fff;border-radius: 5px;}
</style>
<script>
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)
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(méi)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');
text = null;
}
}
aa();
}
</script>
</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(zhǎng)微博</span>
<span id="sp6">公開</span>
<input type="button" value="發(fā)布" id="bt">
</div>
</body>
</html>
不過(guò)，在console控制臺(tái)有對(duì)函數(shù)aa()的報(bào)錯(cuò)
Correcting teacher：滅絕師太Correction time：2019-01-08 09:30:13
Teacher's summary：是的，因?yàn)閠ext.onkeyup = function aa()這里創(chuàng)建的是匿名函數(shù)，不需要函數(shù)名和調(diào)用，我的失誤，你把a(bǔ)a（）刪除就可以啦