app.js

 collectpy : function(){
    wx.cloud.callFunction({
        name:'collectgroup',
        success: res => {
            let r = res.result.list
            if (this.testCallBack){this.testCallBack(r)}
            wx.setStorageSync('collectgroup', r)
            console.log('a')
        },
    });
  },

order.js

app.collectpy(),
console.log('b')

程序是先输出的"b",后输出的"a",如何先输出"a"，再输出"b",让程序按顺序执行