一.编写html表单
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<meta name="viewport" content="width=device-width,initial-scale=1,minimum-scale=1,maximum-scale=1,user-scalable=no">
<meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">
<link rel="stylesheet" type="text/css" href="css/main.css" />
<script src="js/jquery.min.js"></script>
<script src="js/m.js"></script>
<style>
.inner{
width: 100%;
margin: 0 auto;
display: flex;
align-items: center;
justify-content: center;
height: 100vh;
}
.problem{
width:100%;
}
</style>
</head>
<body style="height: 100vh;background-color: #EEF5FD;">
<div class="inner">
<div class="problem">
<div class="custom_img">
<div class="custom_img_top">
<p>图片说明</p>
<p><span class="upload_img_length">0</span>/3</p>
</div>
<!--点击上传图片 触发下面的div 点击事件-->
<div class="upload_img_wrap">
<div id="imgBox"