如何使用JavaScript从get请求获取附件？（其余）

我有一个网页，其中有一个从XMLHttpRequest生成的表。响应包括一个JSON，其中包含一些文本和指向三个附件的关联链接，这些附件可能在那里，也可能不在那里，因此我必须循环这些附件来存储变量并创建链接，如下所示：

function drawWITable(tableObjArr) {

            tableObjArr[event.currentTarget.querySelector(".entry-cell > #cellCount").innerHTML].entries.reverse();
            var tableCount = Object.keys(tableObjArr[event.currentTarget.querySelector(".entry-cell > #cellCount").innerHTML].entries).length;
            var tableHeader = "<table><tr><th class='general'>ФИО</th><th class='general'>Примечания</th><th class='general'>Дата создания</th><th class='general'>Группа</th><th class='attch1'> </th><th class='attch2'> </th><th class='attch3'> </th></tr>";
            var tableContent = "";
            for(i = 0; i < tableCount; i++) {
                tableContent = tableContent + "<tr class='hoverHL'><td>" + tableObjArr[event.currentTarget.querySelector(".entry-cell > #cellCount").innerHTML].entries[i].values.FullName + "</td><td>" + tableObjArr[event.currentTarget.querySelector(".entry-cell > #cellCount").innerHTML].entries[i].values["Detailed Description"] + "</td><td>" + moment(Date.parse(tableObjArr[event.currentTarget.querySelector(".entry-cell > #cellCount").innerHTML].entries[i].values["Work Log Submit Date"])).format('dd, MMMM DD YYYY, HH:mm:ss') + "</td><td>" + tableObjArr[event.currentTarget.querySelector(".entry-cell > #cellCount").innerHTML].entries[i].values.DftSupportGroup + "</td>";
                if (tableObjArr[event.currentTarget.querySelector(".entry-cell > #cellCount").innerHTML].entries[i].values["z2AF Work Log01"] != null) {
                    wrklgID = tableObjArr[event.currentTarget.querySelector(".entry-cell > #cellCount").innerHTML].entries[i].values["Work Log ID"];
                    attachName1 = tableObjArr[event.currentTarget.querySelector(".entry-cell > #cellCount").innerHTML].entries[i].values["z2AF Work Log01"].name;
                    tableContent = tableContent + "<td class='attchentry' onClick='getAttachment1(authToken, wrklgID, attachName1);'>" + "1" + "</td>";
                }
                if (tableObjArr[event.currentTarget.querySelector(".entry-cell > #cellCount").innerHTML].entries[i].values["z2AF Work Log02"] != null) {
                    wrklgID = tableObjArr[event.currentTarget.querySelector(".entry-cell > #cellCount").innerHTML].entries[i].values["Work Log ID"];
                    attachName2 = tableObjArr[event.currentTarget.querySelector(".entry-cell > #cellCount").innerHTML].entries[i].values["z2AF Work Log02"].name;
                    tableContent = tableContent + "<td class='attchentry' onClick='getAttachment2(authToken, wrklgID, attachName2);'>" + "1" + "</td>";
                }
                if (tableObjArr[event.currentTarget.querySelector(".entry-cell > #cellCount").innerHTML].entries[i].values["z2AF Work Log03"] != null) {
                    wrklgID = tableObjArr[event.currentTarget.querySelector(".entry-cell > #cellCount").innerHTML].entries[i].values["Work Log ID"];
                    attachName3 = tableObjArr[event.currentTarget.querySelector(".entry-cell > #cellCount").innerHTML].entries[i].values["z2AF Work Log03"].name;
                    tableContent = tableContent + "<td class='attchentry' onClick='getAttachment3(authToken, wrklgID, attachName3);'>" + "1" + "</td>";
                }
                tableContent = tableContent + "</tr>";
                }
            var tableFooter = "</table>";

            document.getElementById("request-worklog").innerHTML = tableHeader + tableContent + tableFooter;
            $("#request-worklog table tbody tr th").resizable({
                minHeight: 20,
                maxHeight: 20
            });

        }

现在单击后，我只会得到以下形式的网络响应

PNG


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R-Ö|ES±1*ÁìF£_H+±¤ÇXbÔ¨`OÑÙÙ]vvg]¶²Íóýÿï9çÎ;gª|qÞçù=sË9ï9÷üï©÷ÞÙI)ÕVfçn
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*zÀxU±ßF¦|fÈ(ÍÐÑa¢ÃÒì?F3b¬fä8Í£Æ&hFOb¬9ÈaÌ!±jÆf¤¸fBøÄÉ1-dWMdÄ{Ñe¶kÜÑ1æ
9Ö°Ìö±íTÈû«HóýcÌ#d¨]ÂN<as÷ á     ûTðÑoôæ+çÄý0cÌ£/9ÉB>FU`TV[^aì¨o°&2èÂÄ4a"£ÄêÙsUÃ57ªæ_=¬Züj}êiµyÍêþêTÕ×NTlãäDö¢"}§0¼èqÒ|ô~qß=_%äÇbÌ#$â­ù«j{þÅ?>&­àbOÑq{> qå*ã!j¿Á#e(ßpÃ-ª3Wïõô¸ó£ëª¬DØâ¦Ñ7W>1#ý©Mw.üµ>ýÅPß6Õ_?IÊ¡õñ§À*qÆ|=mÁ9¶u¯R-xLµ<ö¸æO?kW`áOñæg¤W(Æ!Yyµª·½]ÎZë®Ià\ö2CõvtÐÚÚÖ½¬çcYâ¨]uªM ]vñ|Ö¬W3ÏÍ+&k
o,Þ L´<ön=rÄsì1@uUWk½½ò\¼TûàyÔ¨¦Õ÷©Þ-[tÒÝ®®ª#5]?ý\Û6BJá­6ßû .¤5ÐD*ÁV®ÎèGÓÒr´F1+'NõÏ"5.[.ïZrÉ5éBÞ{FB­êÈã¶Òò$¢Ì޴ƧÌTïánt­míKÞ»^Dì;Lµüù´Â}?ÖüУ(4sü{AjkÝUEÿüM3Ç
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BFær*ìì4¡µi!Cíļóå2ÌØS¿I5þr¥ªùÆéªrÖñàkØþ®jZuêÝÜì-Tk³¾/MHZOs3FÊèR¦Ç×êãNÚw"dâÔ³T|Ʊ*¡äW8N3óx
®Oº púbìRâ¢_ì®KfÔBÄoZ}¿´iÓ¢ #Ç©æGÁß±Ð+8÷tâæén¾Dý-ÿyÇ+"­!«Ød2û¿\¸é1GH®ðó$"BþÄ;^!fMjÃÍ?òzQC]ù^úÜÌ»koÊ*fÝ%KtáØt)$¦PÙjr/
OÂéÔ-\ìo9%/¿:]Èû1p  YyÄ1~·6Æ etc...

接下来我该怎么办？如何启动下载过程？我可以从另一端获取附件的名称，但仅此而已，没有类型或任何内容。官方文件也没有多大帮助。我对JS还比较陌生，所以也许我遗漏了一些简单的东西

---

谢谢大家!

使用此选项查看您的文件

    let blob = new Blob([byteArray], {type: contentType});
    var blobURL=URL.createObjectURL(blob);
    window.open(blobURL);       

---

获取内容后要下载：

request.onreadystatechange = function() {
        if (this.readyState == 4 && this.status == 200) {
            var content = request.response;
            _html5Saver(content, 'myfile.png');
        }
    };
  }

function _html5Saver(blob , fileName) {
    // to emulate click action
    // because we cannot save directly to client's computer due to security constraints
    var a = document.createElement("a");
    document.body.appendChild(a);
    a.style = "display: none";
    var url = window.URL.createObjectURL(blob);
    a.href = url;
    a.download = fileName;
    a.click();

    document.body.removeChild(a);
}

---

如果希望浏览器下载图像而不是显示图像，则需要设置http标头内容处置：附件。

---

您不应该使用xhr，您应该跳转到链接。

您正在从网页内部下载文件，看起来您希望用户下载它。只需让浏览器处理与图像的链接。

    let blob = new Blob([byteArray], {type: contentType});
    var blobURL=URL.createObjectURL(blob);
    window.open(blobURL);       

request.onreadystatechange = function() {
        if (this.readyState == 4 && this.status == 200) {
            var content = request.response;
            _html5Saver(content, 'myfile.png');
        }
    };
  }

function _html5Saver(blob , fileName) {
    // to emulate click action
    // because we cannot save directly to client's computer due to security constraints
    var a = document.createElement("a");
    document.body.appendChild(a);
    a.style = "display: none";
    var url = window.URL.createObjectURL(blob);
    a.href = url;
    a.download = fileName;
    a.click();

    document.body.removeChild(a);
}