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爱折腾的前端
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前端博客网站
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爱折腾的前端
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痕迹_Mark
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爱折腾的前端 爱折腾的前端 知识总结和回顾 首页 归档 搜索 0% Theme NexT works best with JavaScript enabled 面经 发表于 2022-01-03 更新于 2022-09-26 Class组件和函数组件的区别 Class组件 有组件实例 有生命周期 有state和setState 函数组件 没有组件实例 没有生命周期 没有state和setState，只能接收props 函数组件是一个纯函数，执行完立即销毁，无法存储state Class组件存在的问题 大型组件很难拆分和重构，变得难以测试 相同业务逻辑分散到各个方法中，可能会变得混乱 复用逻辑可能变得复杂，比如 HOC、Render Props 所以 react 中更提倡函数式编程，因为函数更灵活，更易拆分，但函数组件太简单，所以出现了hook，hook就是用来增强函数组件功能的。 useState为什么不能放到条件语句里面？ react通过单链表来管理hooks。update阶段，hooks函数执行的顺序是不变的，就可以根据这个链表拿到当前hooks对应的Hook对象。如果将useState写在条件判断中，可能会导致顺序错乱，导致当前hooks拿到的不是自己对应的Hook对象。 实现一个Promise.all 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 function promiseAll ( promises ) { return new Promise ( ( resolved, rejected ) => { let resultCount = 0 ; let results = new Array (promises.length); for ( let i = 0 ; i < promises.length; i++){ promises[i].then( value => { resultCount++...
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