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promise的实现原理

https://leetcode-cn.com/problems/longest-substring-without-repeating-characters/description/ 无重复字符的最长子串

实现 Array.prototype.Map 实现 add(1)(2)(3).sum() 实现

const request = createRequest({pool: 3});

for(let i = 0; i < 10; i++) {
    request('/test/url').then(() => console.log(i));
}