js使用浏览器的另存为下载文件

页面上的页面如下：

我需要根据返回的url下载文件:

js:

//判断浏览器类型

function myBrowser(){

    var userAgent = navigator.userAgent; //取得浏览器的userAgent字符串

    var isOpera = userAgent.indexOf("Opera") > -1;

    if (isOpera) {

        return "Opera"

    }; //判断是否Opera浏览器

    if (userAgent.indexOf("Firefox") > -1) {

        return "FF";

    } //判断是否Firefox浏览器

    if (userAgent.indexOf("Chrome") > -1){

        return "Chrome";

    }

    if (userAgent.indexOf("Safari") > -1) {

        return "Safari";

    } //判断是否Safari浏览器

    if (userAgent.indexOf("compatible") > -1 && userAgent.indexOf("MSIE") > -1 && !isOpera) {

        return "IE";

    }; //判断是否IE浏览器

    if (userAgent.indexOf("Trident") > -1) {

        return "Edge";

    } //判断是否Edge浏览器

}

function SaveAs5(imgURL)

{

    var oPop = window.open(imgURL,"","width=1, height=1, top=5000, left=5000");

    for(; oPop.document.readyState != "complete"; )

    {

        if (oPop.document.readyState == "complete")break;

    }

    oPop.document.execCommand("SaveAs");

    oPop.close();

}

var odownLoad=null;

function downF(obj){

	odownLoad = document.getElementById(obj);

	var url = $(odownLoad).siblings("input[name='fgycompany.fileUrl']").val();

    oDownLoad(url);

}

function oDownLoad(url) {

	debugger;

    myBrowser();

    if (myBrowser()==="IE"||myBrowser()==="Edge"){

        //IE

        odownLoad.href="#";

        var oImg=document.createElement("img");

        oImg.src=url;

        oImg.id="downImg";

        var odown=document.getElementById("down");

        odown.appendChild(oImg);

        SaveAs5(document.getElementById('downImg').src)

    }else{

        //!IE

        odownLoad.href=url;

        odownLoad.download="";

    }

}