请问怎么用Ts文件封装 Fetch 请求Api？

[flyingdream123]

```c#
async function LoadData() {
  await fetch('http://localhost:57679/api/Customers')
    .then((response) => response.json())
    .then((data) => {
      tableData.value = data
    })
    .catch((err) => {
      console.log(JSON.stringify(err))
    })
}
async function DeleteRow(id: number) {
  let url = `http://localhost:57679/api/Customers/${id}`
  await fetch(url, {
    method: 'delete'
  })
    .then((response) => {
      if (!response.ok) {
        console.log(response)
        throw new Error(JSON.stringify(response))
      }
    })
    .then(() => {
      console.log('then')
      ElMessage.info('删除成功！')
    })
    .catch((err) => {
      console.log('catch')
      console.log(err)
      ElMessage.error('删除失败')
    })
}

```