尝试了用promise，但输出编号发现还是异步执行     for(let i =0;i<res.data.length;i++)    {     var id = res.data[i].uid;     new Promise((resolve, reject) => {         console.log(id)         db.collection('Student')         .where({             _id:id         }).get()         .then(res=>{             if(res.data.length==0)             {                 db.collection('Teacher')                 .where({                     _id:id                 }).get()                 .then(res=>{                     that.data.headlist.push(res.data[0].pic)                     that.setData({                         headlist:that.data.headlist,                     })                     setTimeout(function () {                         console.log(i)                         resolve()                     }, 500)                                      }).catch(res=>{                     console.log(res)                 })             }             else             {                 that.data.headlist.push(res.data[0].pic)                 that.setData({                     headlist:that.data.headlist,                 })                 setTimeout(function () {                     console.log(i)                     resolve()                 }, 500)             }         })     })   } [图片]

A的环境共享给B B能使用A的数据库、云存储。但是B的云函数选择不了A的环境。图中选择的环境是B新开的，如果没开这个环境，这里显示的是`无` 而看不到A的环境选项 如何解决 求助 [图片]