????：總結：感覺js 實例太少，不能足夠加深對js代碼了解，后期還需要重新學習js，多做實例來提升自己；<!doctype html><html lang="en"><head> <meta charset="UTF-8"> <meta name="
總結：感覺js 實例太少，不能足夠加深對js代碼了解，后期還需要重新學習js，多做實例來提升自己；
<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport"
content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<link href="//netdna.bootstrapcdn.com/font-awesome/4.7.0/css/font-awesome.min.css" rel="stylesheet">
<title>Document</title>
<style type="text/css">
body{font-size: 14px;}
.box{width: 600px;height: 200px;border:8px solid hotpink;margin: 0px auto;padding: 10px;}
img{width:200px;height:24px;float:left;}
.box1{float:left;margin-left: 260px}
.text{width: 590px;height: 120px;border:1px solid green;margin:10px 3px;}
#sp1,#sp2,#sp3,#sp4,#sp5,#sp6{float:left;margin-left: 10px;}
button{margin-left: 10px;border: none;border: 1px solid #000;border-radius: 5px;background: yellow;padding: 2px 20px;}
#sp6{margin-left: 140px;}
</style>
<script type="text/JavaScript">
window.onload=function () {
var number=document.getElementById("number");
var text=document.getElementById("text");
var bt=document.getElementById("bt");
text.onkeyup=function textarea() {
var m=140-text.value.length;
if(m<0){
number.style.color="red";
}else {
number.style.color="#888";
}
number.innerHTML=m;
};
bt.onclick=function () {
var m=140-text.value.length;
if (m==140){
alert("您還沒有輸入內(nèi)容！");
}else if(m<0){
alert("輸入的內(nèi)容，不能超出140字符！");
}else{
alert("成功發(fā)布！");
}
}
}
</script>
</head>
<body>
<div class="box">
<img src="/images/1.jpg " alt="">
<div class="box1">還可以輸入<span id="number"></span>字</div>
<textarea class="text" id="text" ></textarea>
<span id="sp1" ><i class="fa fa-frown-o"></i> 表情</span>
<span id="sp2" ><i class="fa fa-image"></i> 圖片</span>
<span id="sp3"><i class="fa fa-video-camera"></i> 視頻</span>
<span id="sp4"><i class="fa fa-hashtag"></i> 話題</span>
<span id="sp5"><i class="fa fa-list-alt"></i> 長微博</span>
<span id="sp6">公開<i class="fa fa-angle-down"></i><button id="bt">發(fā)布</button></span>
<div class="clear"></div>
</div>
</body>
</html>
?? ???：滅絕師太?? ??：2019-01-10 16:43:38
???? ??：<img src="/images/1.jpg " alt="">, alt屬性不能為空，js的案例后面還有呢，不要著急！