wx.cloud.callFunction({
      name: 'XXX',
      data: {
        key: myKey,//传参key
        key2:myKey2//传参key2
      },
      success: res => {
    });

wx.cloud.callFunction({
  name: 'function',
  data: {
    key: '工具类'
  }
}}

云函数

exports.main = async(event) {
  let key = event.key
}