【202309】美團前端一面 · 大廠前端面試真題

[1、手撕：深拷貝](1%E3%80%81%E6%89%8B%E6%92%95%EF%BC%9A%E6%B7%B1%E6%8B%B7%E8%B4%9D.md) [2、promise的輸出](2%E3%80%81promise%E7%9A%84%E8%BE%93%E5%87%BA.md) [3、React是一個什么框架？解決了什么問題？](3%E3%80%81React%E6%98%AF%E4%B8%80%E4%B8%AA%E4%BB%80%E4%B9%88%E6%A1%86%E6%9E%B6%EF%BC%9F%E8%A7%A3%E5%86%B3%E4%BA%86%E4%BB%80%E4%B9%88%E9%97%AE%E9%A2%98%EF%BC%9F.md) [4、為什么虛擬DOM快？](4%E3%80%81%E4%B8%BA%E4%BB%80%E4%B9%88%E8%99%9A%E6%8B%9FDOM%E5%BF%AB%EF%BC%9F.md) [5、虛擬DOM在什么時候都快嘛？](5%E3%80%81%E8%99%9A%E6%8B%9FDOM%E5%9C%A8%E4%BB%80%E4%B9%88%E6%97%B6%E5%80%99%E9%83%BD%E5%BF%AB%E5%98%9B%EF%BC%9F.md) [6、常用的React Hooks有哪些？](6%E3%80%81%E5%B8%B8%E7%94%A8%E7%9A%84ReactHooks%E6%9C%89%E5%93%AA%E4%BA%9B%EF%BC%9F.md) [7、useRef的適用場景](7%E3%80%81useRef%E7%9A%84%E9%80%82%E7%94%A8%E5%9C%BA%E6%99%AF.md) [8、React redux狀態更新后會發生什么？](8%E3%80%81Reactredux%E6%9B%B4%E6%96%B0%E7%8A%B6%E6%80%81%E5%90%8E%E4%BC%9A%E5%8F%91%E7%94%9F%E4%BB%80%E4%B9%88%EF%BC%9F.md) [9、typeof判斷結果有哪些？](9%E3%80%81typeof%E5%88%A4%E6%96%AD%E7%BB%93%E6%9E%9C%E6%9C%89%E5%93%AA%E4%BA%9B%EF%BC%9F.md) [10、typeof判斷數組返回什么？](10%E3%80%81typeof%E5%88%A4%E6%96%AD%E6%95%B0%E7%BB%84%E8%BF%94%E5%9B%9E%E4%BB%80%E4%B9%88%EF%BC%9F.md) [11、怎么判斷數組和對象？](11%E3%80%81%E6%80%8E%E4%B9%88%E5%88%A4%E6%96%AD%E6%95%B0%E7%BB%84%E5%92%8C%E5%AF%B9%E8%B1%A1%EF%BC%9F.md) [12、for in、for of、foreach的區別](12%E3%80%81forin%E3%80%81forof%E3%80%81foreach%E7%9A%84%E5%8C%BA%E5%88%AB.md) [13、for in 能遍歷數組嘛？](13%E3%80%81forin%E8%83%BD%E9%81%8D%E5%8E%86%E6%95%B0%E7%BB%84%E5%98%9B%EF%BC%9F.md) [14、for of 遍歷對象](14%E3%80%81forof%E9%81%8D%E5%8E%86%E5%AF%B9%E8%B1%A1.md)