1. BFC是什么，怎么使用？
   什么是BFC？看这一篇就够了

2. 宏任务与微任务

   async function fn1 () {await fn2()console.log(1);
   }
   async function fn2 () {console.log(2);
   }
   console.log(3);setTimeout(function(){console.log(4)
   },0);
   fn1();
   new Promise((resolve, reject) => {console.log(5);resolve()return new Promise((resolve, reject) => {console.log(6)  resolve()}).then(()=>{console.log(7)})
   }).then(() => {console.log(8);
   })console.log(9);
   // 3,2,5,6,9,1,7,8,4
   

3. 深复制

   function deepClone(obj) {function isObj(objParams) {return typeof objParams === 'object' && objParams !== null;}if(!isObj(obj)) {return obj;}const result = Array.isArray(obj) ? [] : {};for(let i in obj) {if(isObj(obj[i])) {result[i] = deepClone(obj[i]);} else {result[i] = obj[i];}}return result;
   }
   

4. 全排

5. vue的defineProperty和proxy实现对比

6. promise源码

…待续