Post request the difference between the back -end Body and Query

mistake: Required request parameter ‘username’ for method parameter type String is not present

reason: The request parameter type specified in the back -end is query, and I use Body.
POST requests that both Query and Body can pass the parameters. The Query parameters are fighting on the request address, and the value of the params can only be a string, which cannot pass the parameters of the object type. Body biography.

before fixing:

export function login(data) {
  debugger
  return request({
    url: '/api/v1/tcp/auth/login',
    method: 'post',
    data:data
  })
}

After modification:

export function login(data) {
  debugger
  return request({
    url: '/api/v1/tcp/auth/login',
    method: 'post',
    params:data
  })
}

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