test:async function(){     var that=this;     console.log('0');     const p=await new Promise(function(resolve,reject){                   that.a();       resolve();              })            console.log('2');   },   a:function(){         wx.showModal({       showCancel: false,       confirmText:'确定',       content:'1',       title:'提示',       success:function(res){         if(res.confirm){           console.log('1');                   }       }     }) 如何在函数里调用另一个函数?目的是按顺序执行输出012，我试过直接将wx.showModal放到Promise里是可以按顺序输出的。