默认的回调只针对于单一文件上传，不适用于多文件上传，要支持多文件需要对upload.js做一些简单的修改。首先利用编辑器追踪到upload.js文件（下面这段代码位置），然后开始新增两段代码（有注释的为新增代码）。
layui.each(o, function(e, o) {
var r = new FormData;
var id=e;//此变量为区分上传单位的id
r.append(l.field, o), layui.each(l.data, function(e, t) {
t = "function" == typeof t ? t() : t, r.append(e, t)
}), t.ajax({
url: l.url,
type: "post",
data: r,
contentType: !1,
processData: !1,
dataType: "json",
headers: l.headers || {},
success: function(t) {
i++, d(e, t), u()
},
error: function() {
n++, a.msg("请求上传接口出现异常"), m(e), u()
},
xhr: function() {
var e = new XMLHttpRequest;
return e.upload.addEventListener("progress", function(e) {
if (e.lengthComputable) {
e.id=id;//将当前id赋值到e对象，也可新增一参数单独传
/**var k=id;**/单独传
var t = Math.floor(e.loaded / e.total * 100);
"function" == typeof l.progress && l.progress(t, e/*,k*/)
}
}), e
}
})
})修改完后即可在进度回调函数做对应处理，下面是多文件上传完整代码
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Layui</title>
<meta name="renderer" content="webkit">
<meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">
<meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1">
<link rel="stylesheet" href="//res.layui.com/layui/dist/css/layui.css" media="all">
<!-- 注意：如果你直接复制所有代码到本地，上述css路径需要改成你本地的 -->
</head>
<style>
.layui-progress-big{width: 500px}
</style>
<body>
<fieldset class="layui-elem-field layui-field-title" style="margin-top: 30px;">
<legend>高级应用：制作一个多文件列表</legend>
</fieldset>
<div class="layui-upload">
<button type="button" class="layui-btn layui-btn-normal" id="testList">选择多文件</button>
<div class="layui-upload-list">
<table class="layui-table">
<thead>
<tr><th>文件名</th>
<th>进度</th>
<th>大小</th>
<th>状态</th>
<th>操作</th>
</tr></thead>
<tbody id="demoList"></tbody>
</table>
</div>
<button type="button" class="layui-btn" id="testListAction">开始上传</button>
</div>
</body>
<script src="/static/jquery-3.2.1.min.js" charset="utf-8"></script>
<script src="/static/layui/layui.js" charset="utf-8"></script>
<script>
layui.use(['upload','element'], function(){
var upload = layui.upload;
var element = layui.element;
var aa={};
//多文件列表示例
var demoListView = $('#demoList')
,uploadListIns = upload.render({
elem: '#testList'
,field:'img'
,url: ""
,accept: 'file'
,multiple: true
,auto: false
,bindAction: '#testListAction'
,choose: function(obj){
var files = this.files = obj.pushFile(); //将每次选择的文件追加到文件队列
//读取本地文件
obj.preview(function(index, file, result){
var tr = $(['<tr id="upload-'+ index +'">'
,'<td>'+ file.name +'</td>'
,"<td><div class=\"layui-progress layui-progress-big\" lay-showPercent=\"true\" lay-filter='"+index+"'>\n" +
"<div class=\"layui-progress-bar layui-bg-blue\" lay-percent='0%' ></div>\n" +
"</div></td>"
,'<td>'+ (file.size/1014).toFixed(1) +'kb</td>'
,'<td>等待上传</td>'
,'<td>'
,'<button class="layui-btn layui-btn-xs demo-reload layui-hide">重传</button>'
,'<button class="layui-btn layui-btn-xs layui-btn-danger demo-delete">删除</button>'
,'</td>'
,'</tr>'].join(''));
//单个重传
tr.find('.demo-reload').on('click', function(){
obj.upload(index, file);
});
//删除
tr.find('.demo-delete').on('click', function(){
delete files[index]; //删除对应的文件
tr.remove();
uploadListIns.config.elem.next()[0].value = ''; //清空 input file 值，以免删除后出现同名文件不可选
});
demoListView.append(tr);
element.render();
});
}
,allDone: function(obj){ //当文件全部被提交后，才触发
}
,progress: function(n,index){
var percent = n + '%' //获取进度百分比
element.progress(index.id, percent); //可配合 layui 进度条元素使用
}
,done: function(res, index, upload){
if(res.code == 0){ //上传成功
var tr = demoListView.find('tr#upload-'+ index)
,tds = tr.children();
tds.eq(3).html('<span style="color: #5FB878;">上传成功</span>');
tds.eq(4).html(''); //清空操作
return delete this.files[index]; //删除文件队列已经上传成功的文件
}
this.error(index, upload);
}
,error: function(index, upload){
var tr = demoListView.find('tr#upload-'+ index)
,tds = tr.children();
tds.eq(3).html('<span style="color: #FF5722;">上传失败</span>');
tds.eq(4).find('.demo-reload').removeClass('layui-hide'); //显示重传
}
});
});
</script>layui2.6.6增加了类似参数，但是该版本对laydate的时间范围选择有所改动很不适应所以还是继续使用2.5.5版本。
很多人改了没效果建议你进入到浏览器设置里面清除浏览器的缓存，强制刷新不会有效果
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