abstrakt：<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>微博輸入</title>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>微博輸入</title>
<style type="text/css">
#box1{width: 600px;height: 190px;border: 10px solid pink;margin:0 auto;}
#box2{width: 600px;height: 35px;color: #888897;font-size: 14px;}
#box2 span{margin-left: 270px;}
#box2 img{width: 190px;height: 24px;margin-top: 6px;}
#box3 textarea{width: 550px;height: 100px;padding:10px;margin-left: 13px;}
#box4{font-size: 12px;}
#box4 span{width: 50px;height: 20px;display: inline-block;text-align: right;line-height: 20px;}
#box4 #span1{background: url(images/an5.png) no-repeat ;}
#box4 #span2{background: url(images/an4.png) no-repeat ;}
#box4 #span3{background: url(images/an3.png) no-repeat ;}
#box4 #span4{background: url(images/an2.png) no-repeat ;}
#box4 #span5{background: url(images/an1.png) no-repeat ;width: 60px;}
#box4 #span6{margin-left: 150px;}
#box4 #bt{margin-left: 20px;width: 80px;height: 25px;border: none;background-color: #FFC09F;color: #fff;border-radius: 5px;}
</style>
<script type="text/javascript">
window.onload=function(){
var number,m,text;
number = document.getElementById('number');
text=document.getElementById('text');
text.onkeyup=function b(){
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(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");
}
}
}
</script>
</head>
<body>
<div id="box1">
<div id="box2">
<img src="images/12.png">
<span>還可以輸入</span><i id="number"></i>字
</div>
<div id="box3">
<textarea id="text"></textarea>
</div>
<div id="box4">
<span id="span1">表情</span>
<span id="span2">圖片</span>
<span id="span3">視屏</span>
<span id="span4">話(huà)題</span>
<span id="span5">長(zhǎng)微博</span>
<span id="span6">公開(kāi)</span>
<input id="bt" type="submit" value="發(fā)布"">
</div>
</div>
</body>
</html>老師寫(xiě)的代碼中,js中函數(shù)aa已經(jīng)綁定了鍵盤(pán)被松開(kāi)的事件,可以直接觸發(fā)函數(shù),但是老師在后面又調(diào)用了一次函數(shù)aa,結(jié)果瀏覽器出現(xiàn)報(bào)錯(cuò)aa未定義,后來(lái)我刪掉這個(gè)aa函數(shù)的調(diào)用,就沒(méi)有報(bào)錯(cuò)了
Korrigierender Lehrer：韋小寶Korrekturzeit：2019-03-10 13:12:18
Zusammenfassung des Lehrers：寫(xiě)的很不錯(cuò) 老師在寫(xiě)的時(shí)候難免會(huì)出現(xiàn)一些小問(wèn)題 自己發(fā)現(xiàn)要注意自己以后不能犯哦