直接 js 裸写一个下载队列，批量下载不就可以了。如果迁移到其他平台，换成多线程下载就可以了。

```javascript
function OnFinished(aryResult)
{
console.log("下载完成了", aryResult)
}

var download=new JSDownload();
download.FinishCallback=OnFinished;
var downloadList=
[
{Url:"https://abc"},
{Url:"https://abc1"},
{Url:"https://abc2"}
];
download.SetDownload(downloadList);
download.Start();
```

```javascript
//批量下载
function JSDownload()
{
this.DownloadData;
/*
Key:url
Value:
{
Status: 状态 0=空闲 1=下载中, 20=下载成功 30=失败 ,
Message:错误信息,
ProcSuccess: 单个数据到达回调(不处理就 null)
ProcFailed: 单个数据失败回调(不处理就 null)
RecvData: 接收到的数据
}
*/
this.FinishCallback; //全部下载完回调

//设置批量下载地址
this.SetDownload=function(aryDownload)
{
this.DownloadData=new Map();
for(var i in aryDownload)
{
var item=aryDownload[i];
if (this.DownloadData.has(item.Url)) continue;

var downItem={Url:item.Url, ProcSuccess:item.ProcSuccess, ProcFailed:item.ProcFailed , Status:0 };
this.DownloadData.set(downItem.Url,downItem);
}
}

//是否全部下载完成
this.OnFinished=function()
{
for (var item of this.DownloadData) //遍历下载队列 是否都下载完了
{
if (item[1].Status==20 || item[1].Status==30) continue;

return;
}

if (this.FinishCallback) //通知回调 数据都下载完了
{
var aryResult=[];
for (var item of this.DownloadData)
{
var downloadItem=item[1];
if (downloadItem.Status==20)
aryResult.push({Url:downloadItem.Url, Success:true, Data:downloadItem.RecvData});
else
aryResult.push({Url:downloadItem.Url,Success:false});
}

this.FinishCallback(aryResult);
}
}

//开始下载
this.Start=function()
{
var self=this;
for (var item of this.DownloadData)
{
console.log('[JSDownload::Start] start dowloand ', item[0]);
this.AjaxDownload(item[1]);

}
}

this.AjaxDownload=function(item)
{
var self=this;
$.ajax({
url: item.Url,
type:"get",
dataType: "json",
async:true,
success: function (data)
{
if (item.ProcSuccess) item.ProcSuccess(data, self);
item.RecvData=data;
item.Status = 20;
self.OnFinished();
},
error:function(jqXHR, textStatus, errorThrown)
{
if (item.ProcFailed) item.ProcFailed(jqXHR,self);
item.Status = 30;
self.OnFinished();
}
});
item.Status=1;
}
}
```