vue中后端返回文件流（ type “applicationoctet-stream“ ）前端下载对应的格式文件

开发中遇到了所以记录一下。。。。

不废话，我直接直接上代码吧

这里还解决了后端传的json格式，前端下载不了json的文件问题

1、定义一个方法downLoadFUnOne

downLoadFUnOne(data, fileName) {
      var reader = new FileReader();
      var bData = data;
      reader.readAsText(bData, "utf-8");
      reader.onload = function(e) {
        try {
          var msg = JSON.parse(reader.result);
          if (msg && msg.resultCode == "401") {
            clearLoginInfo();
            console.log("401-->token");
            window.location.href = window.SITE_CONFIG.nspmGxb;
          }
          if(bData.type == 'application/json'){
          // 将对象转为json字符串
          const jsonStr = JSON.stringify(msg)
          // 创建一个文本文件Blob对象
          const blob = new Blob([jsonStr], { type: 'application/json' })
          // 构造下载链接
          const url = URL.createObjectURL(blob)
          // 创建下载链接的a标签
          const a = document.createElement('a')
          a.href = url
          a.download = fileName
          // 模拟点击下载链接
          document.body.appendChild(a)
          a.click()
          document.body.removeChild(a)
          // 释放Blob占用的资源
          URL.revokeObjectURL(url)
        }
        } catch (err) {
          let content = data;
          if (window.navigator.msSaveBlob) {
            window.navigator.msSaveBlob(content, fileName);
          } else {
            let elink = document.createElement("a");
            elink.download = fileName;
            elink.style.display = "none";
            let blob = new Blob([content], {
              type: "application/octet-stream"
            });
            elink.href = URL.createObjectURL(blob);
            document.body.appendChild(elink);
            elink.click();
            document.body.removeChild(elink);
          }
        }
      };
    },

2、点击下载在调用上面的downLoadFUnOne方法

downLoadFun(row,index) {
      this.activeIndex = index
        this.$http({
          url: this.$http.adornUrl(
            `server-mgr/assetExport/downloadAssetFile/${row.id}`
          ),
          method: "get",
          responseType: "blob"
          // data: this.$http.adornData(this.dataForm),
        }).then(({ data }) => {
          if(this.activeIndex == index){
            this.downloadIcon = true
          setTimeout(()=>{
            this.downloadIcon = false
          },3000)
        }
          this.downLoadFUnOne(data, row.fileName);
          //   const contentDisposition = data.headers['content-disposition'];
          //     const fileName = decodeURIComponent(contentDisposition.substring(contentDisposition.indexOf('=') + 1));
          //     this.downLoadFUnOne(data.data,fileName)
        });
    },

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