lichenyang

``` js const list =[ {id:1,name:'部门A',parentId:0}, {id:2,name:'部门B',parentId:0}, {id:3,name:'部门C',parentId:1}, {id:4,name:'部门D',parentId:1}, {id:5,name:'部门E',parentId:2}, {id:6,name:'部门F',parentId:3}, {id:7,name:'部门G',parentId:2}, {id:8,name:'部门H',parentId:4} ]; const convert = (list, filters) => { return list.map(item => { let children = filters.filter(child =>...

前端的原始API还有没写的吗？

> @jjeejj 看到过一个说法,forEach能让代码更为简便和可读性更高,在性能不是特别影响的前提下,代码的可拓展性,可读性等会更为重要,而且随着浏览器引擎的升级,应该forEach的性能会被优化的越来越棒的 可读性确实很重要，另外函数式编程也是趋势。

> ### 用 cookie 模拟 localStorage > > 参考 https://developer.mozilla.org/zh-CN/docs/Web/API/Storage/LocalStorage > > ```js > if (!window.localStorage) { > window.localStorage = { > getItem: function (sKey) { > if (!sKey ||...