サマリー：<!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:
<!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 pink; margin: 0 auto;padding: 10px;}
img{float: left;}
.box1{float: left;margin-left: 225px;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 #p1,#p2,#p3,#p4,#p5,#p6{float: left;width: 30px;height: 32px;line-height: 32px;padding-left: 26px;}
#p1{background: url(images/an5.png) no-repeat left center;}
#p2{background: url(images/an4.png) no-repeat left center;}
#p3{background: url(images/an3.png) no-repeat left center;}
#p4{background: url(images/an2.png) no-repeat left center;}
#p5{background: url(images/an1.png) no-repeat left center;width: 40px;}
#p6{ margin-left: 158px;margin-right:15px;color: #888;}
#btn{float: left;width: 80px;height: 30px;border: none;background: #ffc09f;color: #fff;border-radius: 5px;}
</style>
<script type="text/javascript">
var text,number,mm
window.onload = function (){
text = document.getElementById("text")
number = document.getElementById("number")
btn = document.getElementById("btn")
text.onkeyup = function aa(){
mm=140-text.value.length;
if(mm<0){
number.style.color="red"
}else{
number.style.color="#888"
}
number.innerHTML = mm;
}
btn.onclick = function(){
if(mm==140){
alert("你還沒(méi)有輸入");
text.focus();
}else if(mm<0){
alert("超過(guò)輸入文本限度");
text.focus();
}else{
alert("發(fā)布成功");
}
}
}
</script>
</head>
<body>
<div>
<img src="images/12.png" alt="">
<div>還可以輸入<span id="number">140</span>字</div>
<textarea name="" id="text"></textarea>
<span id="p1">表情</span>
<span id="p2">圖片</span>
<span id="p3">視頻</span>
<span id="p4">話題</span>
<span id="p5">長(zhǎng)微博</span>
<span id="p6">公開(kāi)</span>
<input type="button" name="" value="發(fā)布" id="btn">
</div>
</body>
</html>
添削の先生：滅絕師太添削時(shí)間：2019-01-19 16:45:10
先生のまとめ：完成的不錯(cuò)，但是視頻中有一處bug都沒(méi)有發(fā)現(xiàn)哦！可以將aa()這個(gè)函數(shù)名去掉，這里老師創(chuàng)建的是一個(gè)匿名函數(shù)不需要函數(shù)名，老師多寫(xiě)了，你也跟著寫(xiě)了一個(gè)無(wú)用函數(shù)名哦！注意一下