asyncfunctiontest(){(async()=>{vara=awaitthis.test1();varb=awaitthis.test2(a);varc=awaitthis.test3(b);this.doThis(a,b,c);})();}将方法(test1,test2,test3)放在async()=>{})()中是什么意思？我发现它比asyncfunctiontest(){vara=awaitthis.test1();varb=awaitthis.test2(a);varc=awaitthis.test3(b);this.doThis(a,b,c);}使用它有什