一、打印文件

// 报表打印
handlePdf(row) {wayAPI(row.billcode).then((res) => {var binaryData = [];binaryData.push(res);let url = window.URL.createObjectURL(new Blob(binaryData, {type: "application/pdf"})); 					window.open("/static/pdf/web/viewer.html?file=" + encodeURIComponent(url));});
},

二、下载文件，当返回的是文件路径时候（比如：/file/文件.pdf），直接用this.download()方法

waysAPI().then((response) => {this.download(response.data);//response.data是返回的路径
});
//这里的waysAPI是已经封装好了请求

三、下载文件，当返回是文件流的形式时候（文件流）

excels(qparams).then(response => { //qparams是接口参数const blob = new Blob([response], {type: "application/vnd.ms-excel;charset=utf-8"});const fileName = '下载的表格名称' + '.xlsx';if (window.navigator.msSaveOrOpenBlob) {navigator.msSaveBlob(blob, fileName);} else {const link = document.createElement("a");link.href = window.URL.createObjectURL(blob);link.download = fileName;link.click();window.URL.revokeObjectURL(link.href);}
});

上面是excel，如果是pdf，那么

const blob = new Blob([res.data], {type: 'application/pdf'});

api.js文件中

// 导出入库单
export function excels(query) {return request({url: 'urls',method: 'get',params: query,responseType: 'blob' //这个必须，不然会乱码})
}