vue前端下载流文件不正常的解决方法

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this.$http        .post(          "report/download",          {            name: this.name,            html: imageWrapper.innerHTML,          },          {            headers: {              "Content-Type": "application/json;charset=utf-8",              //"Content-Type": "application/x-www-form-urlencoded",            },            responseType: "blob", //关键          }        )        .then((res) => {          const pdfUrl = window.URL.createObjectURL(            new Blob([res.data], { type: `application/pdf` })          );            const link = document.createElement("a");          link.href = pdfUrl;          link.setAttribute("download", this.name);          document.body.appendChild(link);          link.click();          link.remove(); // 一次性的，用完就删除a标签        });