js 判断数据是否为blob类型，blob数据转JSON和对象

判断数据是否为blob类型

function isBlob(obj) {
    return obj instanceof Blob;
}

blob数据转JSON和对象

let blob = data;
    var reader = new FileReader();
    reader.readAsText(blob, 'utf-8');
    reader.onload = function (e) {
      let res = JSON.parse(reader.result);
    }
    reader.onerror = function (e) {
      console.log('FileReader:', e)
    }

其他：

async function blobToObj(data) {
  return new Promise((resolve, reject) => {
    let blob = data;
    var reader = new FileReader();
    reader.readAsText(blob, 'utf-8');
    reader.onload = function (e) {
      let res = JSON.parse(reader.result);
      resolve(res);
    }
    reader.onerror = function (e) {
      console.log('FileReader:', e)
    }
  })
}

if (data instanceof Blob) {
        data = await blobToObj(data);
      }