定义一个函数

function requestPOST(url, data, cb) {
    const iframe = document.createElement('iframe')
    iframe.name = 'iframePost'
    iframe.style.display = 'none'
    document.body.appendChild(iframe)

    const form = document.createElement('form')
    // input用来存放post提交的数据
    const input = document.createElement('input')

    iframe.addEventListener('load', function () {
      if (cb && typeof cb == 'function') {
        cb()
      }
    })

    form.action = url
    form.target = iframe.name
    form.method = 'post'

    Object.keys(data).forEach(key => {
      input.name = key
      input.value = data[key].toString()
      form.appendChild(input.cloneNode())
    })

    form.style.display = 'none'
    document.body.appendChild(form)
    form.submit()

    document.body.removeChild(form)
  }

调用

requestPOST('https://ocpc.baidu.com/ocpcapi/api/uploadConvertData', {
      data: data
    }, function (response) {
      console.log('response', response)
    })