摘要：<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>微博输入字数</title> <style> .box{ width:700px; height: 165px; background-color
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>微博输入字数</title>
<style>
.box{
width:700px;
height: 165px;
background-color: #fff;
border:8px solid pink;
margin:0px auto;
padding:10px;
}
img{
float:left;
}
.box_1{
float:left;
margin-left:310px;
width:150px;
height: 26px;
text-align: right;
font-size: 14px;
color:#888;
}
.box_1 span{
font-size: 16px;
font-weight: bold;
}
#text{
width:700px;
height:100px;
border:1px solid #888;
margin-top:5px;
}
#sp1,#sp2,#sp3,#sp4,#sp5,#sp6{
float:left;
width:50px;
height: 27px;
line-height: 27px;
padding-left:32px;
}
#sp1{
background: url(img/2.png) no-repeat left center;
}
#sp2{
background: url(img/3.png) no-repeat left center;
}
#sp3{
background: url(img/4.png) no-repeat left center;
}
#sp4{
background: url(img/5.png) no-repeat left center;
}
#sp5{
background: url(img/6.png) no-repeat left center;
width:70px;
}
#sp6{
margin-left:93px;
margin-right:15px;
color:#888;
}
#bt{
float:left;
width:80px;
height:26px;
line-height: 26px;
border:none;
color:#fff;
background: #ff8140;
border-radius:5px;
}
</style>
<script type="text/javascript">
var text,number,m,bt;
window.onload=function(){
text=document.getElementById("text");
number=document.getElementById("number");
bt=document.getElementById("bt")
text.onkeyup=function text_1(){
m=140-text.value.length
if(m<0){
number.style.color="red";
}else{
number.style.color="#888";
}
number.innerHTML=m;
}
bt.onclick=function text_2(){
if(m==140){
alert("请输入文字");
text.focus();
}else if(m<0){
alert("您输入的文字超过140")
text.focus();
}else{
alert("发布成功")
}
}
text_1();
text_2();
}
</script>
</head>
<body>
<div class="box>
<img src="img/1.jpg">
<div class="box_1">还可以输入<span id="number"></span>字</div>
<textarea id="text" ></textarea>
<span id="sp1">表情</span>
<span id="sp2">图片</span>
<span id="sp3">视频</span>
<span id="sp4">话题</span>
<span id="sp5">头条文章</span>
<span id="sp6">公开</span>
<input type="button" value="发布" id="bt" >
</div>
</body>
</html>
window.onload //全局调用
最后要调用函数
批改老师：灭绝师太批改时间：2018-11-23 09:56:25
老师总结：知识点备注不全面奥，一定要理解，吃透。不要为了完成作业而完成作业奥！
