PDF批量下载

let This = this
            let ItemData = indexJSON.data.catalog.list
            for (var i = 0; i < ItemData.length; i++) {
                for (var j = 0; j < ItemData[i].children.length; j++) {
                    let tempItem = ItemData[i].children[j ]
                    This.FileDownloadBtn(tempItem.url, tempItem.name)
                }
            }

// 下载文件
            FileDownloadBtn(PDFDownUrl, fileName) {
                console.log(PDFDownUrl, fileName)
                let This = this
                const req = new XMLHttpRequest();
                req.open('get', PDFDownUrl, true);
                req.responseType = 'blob';
                req.setRequestHeader('Content-Type', 'application/json');
                req.onload = function() {
                    const data = req.response;
                    const blob = new Blob([data]);
                    const blobUrl = window.URL.createObjectURL(blob);
                    This.download(blobUrl, fileName);
                };
                req.send();
            },

            download(blobUrl, fileName) {
                const a = document.createElement('a');
                a.download = fileName;
                a.href = blobUrl;
                a.click();
            },