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      字符串\n        类型判断\n        ...\n    2. 特点:\n        模块化\n        函数式 / 声明式\n\n## 1. 函数的call() / apply() / bind()\n    1. 区别call()/apply()/bind()\n        call(obj)/apply(obj): 调用函数, 指定函数中的this为第一个参数的值\n        bind(obj): 返回一个新的函数, 新函数内部会调用原来的函数, 且this为bind()指定的第一参数的值\n        注意: 如果obj是null/undefined, this为window\n    2. 应用\n        call()/bind()应用: 根据伪数组生成真数组\n        bind(): react中组件的自定义方法 / vue中的事件回调函数内部\n    3. 自定义call()/apply()\n        1). 给obj添加一个临时方法, 方法名任意, 值为当前函数\n        2). 通过obj调用这个临时方法, 并将接收的参数传入\n        3). 删除obj上的这个临时方法属性\n    4. 自定义实现bind()\n        1). 返回一个新函数\n        2). 在新函数内部通过原函数对象的call方法来执行原函数\n            指定原函数的this为obj\n            指定参数为bind调用的参数和后面新函数调用的参数\n\n## 2. 函数的节流(throttle)与防抖(debounce)\n    1. 事件频繁触发可能造成的问题?\n        1). 一些浏览器事件:window.onresize、window.mousemove等，触发的频率非常高，会造成浏览器性能问题\n        2). 如果向后台发送请求，频繁触发，对服务器造成不必要的压力\n    2. 如何限制事件处理函数频繁调用\n        1). 函数节流\n        2). 函数防抖\n    3. 函数节流(throttle)\n        1). 理解: \n            在函数需要频繁触发时: 函数执行一次后，只有大于设定的执行周期后才会执行第二次\n            适合多次事件按时间做平均分配触发\n        2). 场景：\n            窗口调整（resize）\n            页面滚动（scroll）\n            DOM 元素的拖拽功能实现（mousemove）\n            抢购疯狂点击（click）\n    4. 函数防抖(debounce)\n        1). 理解:\n            在函数需要频繁触发时: 在规定时间内，只让最后一次生效，前面的不生效。\n            适合多次事件一次响应的情况\n        2). 场景：\n            输入框实时搜索联想（keyup/input）\n\n## 3. 数组声明式系列方法\n    1. 区别命令式与声明式\n    2. 使用数组声明式系列方法\n        1). map()\n        2). reduce()\n        3). filter()\n        4). find()\n        5). findIndex()\n        6). every()\n        7). some()\n    3. 自定义数组声明式系列方法\n\n## 4. 数组去重(unique)\n    1. 理解: \n        根据当前数组产生一个去除重复元素后的新数组\n        如: [2, 3, 2, 7, 6, 7] ==> [2, 3, 7, 6]\n    2. 实现:\n        方法1: 利用forEach()和indexOf()\n               说明: 本质是双重遍历, 效率差些\n        方法2: 利用forEach() + 对象容器\n               说明: 只需一重遍历, 效率高些\n        方法3: 利用ES6语法: from + Set 或者 ... + Set\n               说明: 编码简洁\n\n## 5. 数组合并(concat)与切片(slice)\n    1. 合并concat()\n        语法: var new_array = concat(array, value1[, value2[, ...[, valueN]]]) \n        功能: 将n个数组或值与当前数组合并生成一个新数组, 原始数组不会被改变 \n    2. 切片slice()\n        语法: var new_array = slice(array, [begin[, end]])\n        功能: 返回一个由 begin 和 end 决定的原数组的浅拷贝, 原始数组不会被改变\n\n## 6. 数组扁平化(flatten)\n    1. 理解: \n        取出嵌套数组(多维)中的所有元素放到一个新数组(一维)中\n        如: [1, [3, [2, 4]]]  ==>  [1, 3, 2, 4]\n    2. 实现:\n        方法一: 递归 + reduce() + concat()\n        方法二: ... + some() + concat()\n\n## 7. 数组取真与分块\n    1. compact(array): 返回数组中所有真值元素组成的新数组\n    2. chunk(array, size): 将数组拆分成多个 size 长度的区块，每个区块组成小数组,整体组成一个二维数组\n\n## 8. 数组取差异与合并\n    1. difference(arr1, arr2)\n        得到当前数组中所有不在arr中的元素组成的数组(不改变原数组)\n        如: difference([1,3,5,7], [5, 8])  ==> [1, 3, 7]\n    2. mergeArray(arr1, arr2): \n        将arr2与arr1的元素进行合并组成一个新的数组(不改变原数组)\n        如: mergeArray([1,3,5,7,5], [5, 8]) ==> [1, 3, 5, 7, 5, 8]\n\n## 9. 删除数组中部分元素\n    1. pull(array, ...values): \n        删除原数组中与value相同的元素, 返回所有删除元素的数组\n        说明: 原数组发生了改变\n        如: pull([1,3,5,3,7], 2, 7, 3, 7) ===> 原数组变为[1, 5], 返回值为[3,3,7]\n    2. pullAll(array, values): \n        功能与pull一致, 只是参数变为数组\n        如: pullAll([1,3,5,3,7], [2, 7, 3, 7]) ===> 数组1变为[1, 5], 返回值为[3,3,7] \n\n## 10. 得到数组的部分元素\n    1. drop(array, count): \n        得到当前数组过滤掉左边count个后剩余元素组成的数组\n        说明: 不改变当前数组, count默认是1\n        如: drop([1,3,5,7], 2) ===> [5, 7]\n    2. dropRight(array, count): \n        得到当前数组过滤掉右边count个后剩余元素组成的数组\n        说明: 不改变当前数组, count默认是1\n        如: dropRight([1,3,5,7], 2) ===> [1, 3]\n\n## 11. 自定义new和instanceof工具函数\n    1. 自定义new工具函数\n        语法: newInstance(Fn, ...args)\n        功能: 创建Fn构造函数的实例对象\n        实现: 创建空对象obj, 调用Fn指定this为obj, 返回obj\n    2. 自定义instanceof工具函数\n        语法: myInstanceOf(obj, Type)\n        功能: 判断obj是否是Type类型的实例\n        实现: Type的原型对象是否是obj的原型链上的某个对象, 如果是返回tru, 否则返回false\n\n## 12. 合并多个对象\n    语法: object mergeObject(...objs)\n    功能: 合并多个对象, 返回一个合并后对象(不改变原对象)\n\n## 13. 对象/数组拷贝\n    1. 区别浅拷贝与深拷贝\n        纯语言表达:\n            浅拷贝: 只是复制了对象属性或数组元素本身(只是引用地址值)\n            深拷贝: 不仅复制了对象属性或数组元素本身, 还复制了指向的对象(使用递归)\n        举例说明: persons拷贝\n            浅拷贝: 只是拷贝了每个person对象的引用地址值, 每个person对象只有一份\n            深拷贝: 每个person对象也被复制了一份新的\n    2. 实现浅拷贝\n        方法一: 利用ES6语法\n        方法二: 利用ES5语法\n    3. 实现深拷贝\n        1). 大众乞丐版\n            问题1: 函数属性会丢失\n            问题2: 循环引用会出错\n        2). 面试基础版本\n            解决问题1: 函数属性还没丢失\n        3). 面试加强版本\n            解决问题2: 循环引用正常\n        4). 面试加强版本2(优化遍历性能)\n            数组: while | for | forEach() 优于 for-in | keys()&forEach() \n            对象: for-in 与 keys()&forEach() 差不多\n\n## 14. 字符串处理的系列方法\n    1. 字符串倒序: reverseString(str)  生成一个倒序的字符串\n    2. 字符串是否是回文: palindrome(str) 如果给定的字符串是回文，则返回 true ；否则返回 false\n    3. 截取字符串: truncate(str, num) 如果字符串的长度超过了num, 截取前面num长度部分, 并以...结束\n\n## 15 手写继承\n    实现方式: 寄生组合式\n    说明: 其它方式的继承会在一次实例中调用两次父类的构造函数或有其它缺点\n\n## 16. 手写事件总线: event-bus\n    1. EventBus: 包含所有功能的全局事件总线对象\n    2. EventBus.on(eventName, listener): 绑定事件监听\n    3. EventBus.emit(eventName, data): 分发事件\n    4. EventBus.off(eventName): 解绑事件监听\n\n## 17. 手写消息订阅与发布: pub-sub\n    1. PubSub: 包含所有功能的订阅/发布消息的管理者\n    1. PubSub.subscribe(msg, subscriber): 订阅消息: 指定消息名和订阅者回调函数\n    2. PubSub.publish(msg, data): 异步发布消息: 指定消息名和数据\n    3. PubSub.publishSync(msg, data): 同步发布消息: 指定消息名和数据\n    4. PubSub.unsubscribe(flag): 取消订阅: 根据标识取消某个或某些消息的订阅\n\n## 18. 手写Promise\n    1. 定义整体结构\n    2. Promise构造函数的实现\n    3. promise.then()/catch()的实现\n    4. Promise.resolve()/reject()的实现\n    5. Promise.all/race()的实现\n    6. Promise.resolveDelay()/rejectDelay()的实现\n\n## 19. 手写ajax请求函数: axios\n    1.函数的返回值为promise, 成功的结果为response, 失败的结果为error\n    2.能处理多种类型的请求: GET/POST/PUT/DELETE\n    3.函数的参数为一个配置对象\n      {\n        url: '',   // 请求地址\n        method: '',   // 请求方式GET/POST/PUT/DELETE\n        params: {},  // GET/DELETE请求的query参数\n        data: {}, // POST或DELETE请求的请求体参数 \n      }\n    4.响应json数据自动解析为js的对象/数组\n\n\n\n","readmeFilename":"README.md","homepage":"https://github.com/a4255844/190719_Utils_syb#readme","repository":{"type":"git","url":"git+https://github.com/a4255844/190719_Utils_syb.git"},"bugs":{"url":"https://github.com/a4255844/190719_Utils_syb/issues"}}