前端js读取文件输出

  <a-upload :file-list="fileList" :before-upload="beforeUpload" @remove="handleRemove">
      <a-button>
        <upload-outlined></upload-outlined>
        Select File
      </a-button>
    </a-upload>

async function beforeUpload(file: any) {
  const res = await redFile(file);
  console.log('res', res);
  return false;
}
function redFile(file) {
  return new Promise((resolve, reject) => {
    try {
      const fileReader = new FileReader();
      fileReader.readAsText(file);
      fileReader.onload = function (e) {
        resolve(e.target.result);
      };
    } catch (err) {
      reject(err);
    }
  });
}