如何在一个数组中发送多个Formdata来表示后端

const data1 = {
  key1: 'value1',
  key2: 'value2'
};

const data2 = {
  key3: 'value3',
  key4: 'value4'
};

const formData1 = new FormData();
formData1.append('key1', data1.key1);
formData1.append('key2', data1.key2);

const formData2 = new FormData();
formData2.append('key3', data2.key3);
formData2.append('key4', data2.key4);

const formDataArray = [];
formDataArray.push(formData1);
formDataArray.push(formData2);

fetch('backend-url', {
  method: 'POST',
  body: JSON.stringify(formDataArray)
})
.then(response => response.json())
.then(data => {
  // 处理后端返回的数据
})
.catch(error => {
  // 处理请求错误
});