The following is from Max Howell @twitter: Google: 90% of our engineers use the software you wrote (Homebrew), but you can't invert a binary tree on a

The K−P factorization of a positive integer N is to write N as the sum of the P-th power of K positive integers. You are supposed to write a program t

There is a classical process named partition in the famous quick sort algorithm. In this process we typically choose one element as the pivot. Then th

This time your job is to fill a sequence of N positive integers into a spiral matrix in non-increasing order. A spiral matrix is filled in from the fi

Given a sequence of positive numbers, a segment is defined to be a consecutive subsequence. For example, given the sequence { 0.1, 0.2, 0.3, 0.4 }, we

A supply chain is a network of retailers（零售商）, distributors（经销商）, and suppliers（供应商）-- everyone involved in moving a product from supplier to customer

常规的思路是循环遍历，一个个绑定事件，缺点是dom操作次数过多。 //获取dom var list = document.getElementById('test'); var li = list.getElementsByTagName('li');

跨域的主要解决方式：JSONP，CORS（即加上CORS 请求头（诸如 Access-Control-Allow-Origin 等配置）），代理（Webpack代理，ngnix反向代理）。当然不止前面四种，还有其他一些这里就限于篇幅不提到了，可以参考网络上其他博客。 其中 两种代理的解决办法可以看另

使用setInterval模拟setTimeout: 执行一次setInterval然后清除即可 function mySetTimeout(fn, t){ let timer = setInterval(()=>{ fn(); clearInterval(t

1、代理为什么能解决跨域问题 代理就是一个服务，该服务的作用就是：监测本地的接口，当接口为需要访问外网的接口时，代理替你访问这个接口并把返回值返回给当前网页。 并不是网页服务访问代理，而是代理检测网页服务内部的接口服务，当符合条件的服务出现的时候，代理拦截住，并替代网页服务返回结果 2.webpac