vue-下载图片和word（兼容IE9+）

背景：下载图片和word，接口返回的图片是base64，word返回的是文件流

（后台java要用apache的base64转图片，不能用java自带的base64解析图片）

针对IE9已上代码参考

IE9参考

针对谷歌火狐

谷歌火狐

代码参考：

if(navigator.userAgent.indexOf("MSIE 9.0")>0){

            layer.msg('抱歉，此功能仅支持IE10及以上');

            return

          }

          let imgUrl = "data:image/png;base64," + res;

          let blob = this.base64ToBlob(imgUrl, res)

          var a = document.createElement('a')

          document.body.appendChild(a);

          a.style.display='none';

          a.href = blob

          a.download = this.selectedBarcode + '.png' 

          console.log('download ??')

          console.log('window.navigator.msSaveOrOpenBlob ??')

          if (window.navigator.msSaveOrOpenBlob) {

            return window.navigator.msSaveOrOpenBlob(blob, this.selectedBarcode + '.png');

          }

          let evt = document.createEvent("HTMLEvents");

          evt.initEvent("click", true, true);

          a.href = URL.createObjectURL(blob);

          a.click(); 

if(navigator.userAgent.indexOf("MSIE 9.0")>0){

            layer.msg('抱歉，此功能仅支持IE10及以上');

          } else {

            let blob = new Blob([res], {type: 'application/vnd.ms-word;charset=UTF-8'});

            let fileName = this.selectedBarcode  + '.doc';

            if (window.navigator.msSaveOrOpenBlob) {

              navigator.msSaveBlob(blob, fileName)

            } else {

              var link = document.createElement('a');

              link.href = window.URL.createObjectURL(blob);

              link.download = fileName;

              link.click();

              window.URL.revokeObjectURL(link.href) //释放内存

            }

          }