文件下载

const getFile = url => {
      return new Promise((resolve, reject) => {
        axios.get(url, {params: data}).then(data => {
          if (data.data) {
            resolve(data.data);
          } else {
            message.error('获取文件失败');
          }
        }).catch(error => {
          message.error('获取文件失败');
          reject(error.toString());
        });
      });
    }
      
    const saveAs = (blob, filename) => {
      if (window.navigator.msSaveOrOpenBlob) {
        navigator.msSaveBlob(blob, filename);
      } else {
        const link = document.createElement('a');
        const body = document.querySelector('body');
        const file = new Blob([blob], {type: 'application/json'});
        link.href = window.URL.createObjectURL(file); // 创建对象url
        link.download = filename;
    
        link.style.display = 'none';
        body.appendChild(link);
    
        link.click();
        body.removeChild(link);
        // 通过调用 URL.createObjectURL() 创建的 URL 对象
        window.URL.revokeObjectURL(link.href); 
      }
    }
    getFile(url).then((blob) => {
      saveAs(blob, filename);
    });