js函数实现(js函数实现简单加法计算)
// 函数柯里化（思路：递归收集参数，参数刚好时调用原函数）function curry(fn, args = []){ return (...arg) => { let _arg = args.concat(arg) if(_arg.length != fn.length){ return curry(fn, _arg) }else{ return fn(..._arg) } } }// 节流function throttle(fn, delay){ let timer; return () => { if(timer){ return } timer = setTimeout(() => { fn() timer = null }, delay) } }// 防抖function debounce(fn, delay){ let timer; return () => { if(timer){ clearTimeout(timer) } timer = setTimeout(() => { fn() }, delay) } }// callfunction mycall(that, ...args){ that = that == null ? window : new Object(that) that.fn = this; that.fn(...args); delete that.fn; }Function.prototype.mycall = mycall// applyfunction myapply(that, args){ that = that == null ? window : new Object(that) that.fn = this; that.fn(...args); delete that.fn; }Function.prototype.myapply = myapply// 数组转树const currentArray = [ {id:"01", name: "张大大", pid:"", job: "项目经理"}, {id:"02", name: "小亮", pid:"01", job: "产品leader"}, {id:"03", name: "小美", pid:"01", job: "UIleader"}, {id:"04", name: "老马", pid:"01", job: "技术leader"}, {id:"05", name: "老王", pid:"01", job: "测试leader"}, {id:"06", name: "老李", pid:"01", job: "运维leader"}, {id:"07", name: "小丽", pid:"02", job: "产品经理"}, {id:"08", name: "大光", pid:"02", job: "产品经理"}, {id:"09", name: "小高", pid:"03", job: "UI设计师"}, {id:"10", name: "小刘", pid:"04", job: "前端工程师"}, {id:"11", name: "小华", pid:"04", job: "后端工程师"}, {id:"12", name: "小李", pid:"04", job: "后端工程师"}, {id:"13", name: "小赵", pid:"05", job: "测试工程师"}, {id:"14", name: "小强", pid:"05", job: "测试工程师"}, {id:"15", name: "小涛", pid:"06", job: "运维工程师"} ];function arrToTree(list, pid){ let children = list.filter(item => item.pid == pid); return children.map(item => { item.children = arrToTree(list, item.id); return item; }) }// instanceof实现function instanceOf(origin, target) { while(1){ if(origin.__proto__ == target.prototype){ return true } if(origin.__proto__ == null){ return false } origin = origin.__proto__ } }// promise(丑陋的)class UglyPromise { constructor(callback){ this.status = 'pending' this.value = undefined this.sucessCb = [] this.failedCb = [] const resolve = value => { if(this.status === 'pending'){ this.status = 'success' this.value = value this.sucessCb.forEach(fn => { fn(value) }) } } const reject = value => { if(this.status === 'pending'){ this.status = 'failed' this.value = value this.failedCb.forEach(fn => { fn(value) }) } } try { callback(resolve, reject) } catch(e) { reject(e) } } then(successCb, failedCb){ if(typeof successCb === 'function'){ if(this.status == 'pending'){ this.sucessCb.push(successCb) }else{ successCb(this.value) } } if(typeof failedCb === 'function'){ if(this.status == 'pending'){ this.failedCb.push(failedCb) }else{ failedCb(this.value) } } return this } catch(failedCb){ if(typeof failedCb === 'function'){ if(this.status == 'pending'){ this.failedCb.push(failedCb) }else{ failedCb(this.value) } } } } UglyPromise.resolve = value =>{ return new UglyPromise(rev => { rev(value) }) } UglyPromise.race = arr =>{ return new MyPromise((rev,rej) => { for(let i = 0;i < arr.length;i++){ arr[i].then(res => { rev(res) }).catch(e => { rej(e) }) } }) } UglyPromise.all = arr =>{ let length = arr.length; let count = 0; let result = new Array(length); if(length == 0){ return UglyPromise.resolve() } return new UglyPromise((rev,rej) => { for(let i = 0;i<arr.length;i++){ arr[i].then(res => { result[i] = res // 为了结果顺序与开始顺序一致 if(++count == length){ rev(result) } }).catch(e => { rej(e) }) } }) }
作者：shaoyf
链接：https://juejin.cn/post/7037033664667975716
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