js HTML5多图片上传及预览实例解析（不含前端的文件分割）

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本文实例为大家分享了js HTML5多图片上传及预览实例，供大家参考，具体内容如下

主要运用
1、HTML5 files可以选择多文件，以及获取多文件信息
2、XMLHTTPRequest对象，发送HTTP传输请求
3、将每一个文件放在FormData，进行传输
4、利用readAsDataURL将图片内容直接变成url，放在img标签的src当中，生成可预览的图片

html+css+js代码

<!DOCTYPE html>
<head>
<meta http-equiv="Content-Type" content="text/html" charset="utf-8" />
<title>test html FileReader</title>
<style type="text/css">
html,body,header,footer,div,ul,li,h1,h2,h3,h4,h5,h6,label,input,textarea,p,span,a{
 padding: 0;
 margin: 0;
}
img {
 border: 0;
}
em,strong{
 font-weight: normal;
 font-style: normal;
}
ul {
 list-style: none;
}
h1,h2,h3,h4,h5,h6 {
 font-weight: normal;
 font-size: 100%;
}
a,a:after{
 text-decoration:none;
}
.photo_wrap{
 clear:both;
}
.photo_wrap li{
 margin:10px;
 width:150px;
 float:left;
}
.photo_box {
 height:150px;
 width:150px;
 overflow:hidden;
 position:relative;
}
.photo_box .img1{
 height:150px;
}
.photo_box .img2{
 width:150px;
}
.upload_result{
 height:50px;
}
.btns{
 position:relative;
 height:40px;
 width:100px;
 float:left;
}
.btn{
 height:40px;
 line-height:40px;
 color:#FFF;
 display:block;
 border-radius:3px;
 text-align:center;
 background-color: #FF5581; /* Old browsers */
 background-image: -moz-linear-gradient(top,#FA7B9C 0%, #FF5581 100%); /* FF3.6+ */
 background-image: -webkit-gradient(linear, left top, left bottom, color-stop(0%,#FA7B9C), color-stop(100%,#FF5581)); /* Chrome,Safari4+ */
 background-image: -webkit-linear-gradient(top,#FA7B9C 0%, #FF5581 100%); /* Chrome10+,Safari5.1+ */
 background-image: -o-linear-gradient(top,#FA7B9C 0%, #FF5581 100%); /* Opera 11.10+ */
 background-image: -ms-linear-gradient(top,#FA7B9C 0%, #FF5581 100%); /* IE10+ */
 background-image: linear-gradient(to bottom,#FA7B9C 0%, #FF5581 100%); /* W3C */
 filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#FA7B9C', endColorstr='#FF5581',GradientType=0 ); /* IE6-8 */
 box-shadow:0 1px 0 rgba(255, 255, 255, 0.3) inset, 0 1px 2px rgba(0, 0, 0, 0.3);
}
.btn_add_pic{
 width:100px;
 position:absolute;
 top:0;
 left:0;
}
.btn_upload{
 width:100px;
 margin:0 10px 10px;
 float:left;
}
.btn:hover,
.btn_cur{
 background-color: #FB99B1; /* Old browsers */
 background-image: -moz-linear-gradient(top,#FB99B1 0%, #FF5581 100%); /* FF3.6+ */
 background-image: -webkit-gradient(linear, left top, left bottom, color-stop(0%,#FB99B1), color-stop(100%,##FF5581)); /* Chrome,Safari4+ */
 background-image: -webkit-linear-gradient(top,#FB99B1 0%, #FF5581 100%); /* Chrome10+,Safari5.1+ */
 background-image: -o-linear-gradient(top,#FB99B1 0%, #FF5581 100%); /* Opera 11.10+ */
 background-image: -ms-linear-gradient(top,#FB99B1 0%, #FF5581 100%); /* IE10+ */
 background-image: linear-gradient(to bottom,#FB99B1 0%, #FF5581 100%); /* W3C */
 filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#FB99B1', endColorstr='#FF5581',GradientType=0 ); /* IE6-8 */
}
.file_input_wrap{
 position:absolute;
 top:0;
 left:0;
 width:100px;
 height:40px;
}
.file_input_wrap label{
 width:100%;
 height:100%;
 display:block;
 opacity:0;
 cursor:pointer;
}
.file_input_wrap input{
 opacity:0;
 filter:alpha(opacity=0);/*ie8及以下*/
 position:absolute;
 top:7px;
 right:173px;
 cursor:pointer;
 width:95px;
}
.photo_box .icon_pos{
 height:20px;
 width:20px;
 display:block;
 position:absolute;
 right:0;
 bottom:0;
}
.photo_box .loading{
 height:10px;
 display:block;
 position:absolute;
 left:0;
 bottom:0;
 background-image:url(loading.gif);
}
.sucess_icon{
 background-image:url(icons_01.png);
 background-position:0 0;
}
.error_icon{
 background-image:url(icons_01.png);
 background-position:-20px 0;
}
</style>
</head>

<body>
<div class="btns">
 <a class="btn btn_add_pic" id="J_add_pic" href="javascript:;">添加图片</a>
 <div class="file_input_wrap">
 <input type="file" id="file" name="file" accept="image/*" multiple onChange="fileInfo(this)" />
 <label id="J_add_area"></label>
 </div>
</div>
<a class="btn btn_upload" id="J_upload" href="javascript:;">开始上传</a>
<div id="J_photo_wrap">
 <ul class="photo_wrap">
 </ul>
</div>
</body>
<script type="text/javascript" src="/UploadFiles/2021-04-02/jquery-1.7.2.min.js">

php收到文件的代码（这里只获取文件名字、类型、大小，没有进行其它操作） 


<"name" => $name,
 "type" => $type,
 "size" => $size,
 "status" => 1
 );
 
 $return = json_encode($return);
 
 echo $return;
?>





存在的问题

1、为了生成缩略图，readAsDataURL读取文件内容会占用内存，所以大图片会造成浏览器卡住或者奔溃

2、上传没有进行分段处理
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。

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