目錄

• 1. 輸入一個(gè)值，返回其數(shù)據(jù)類型**
• 2. 數(shù)組去重
• 3. 字符串去重
• 4. 深拷貝 淺拷貝
• 5. reverse底層原理和擴(kuò)展
• 6. 圣杯模式的繼承
• 7. 找出字符串中第一次只出現(xiàn)一次的字母
• 8. 找元素的第 n 級(jí)父元素
• 9. 返回元素的第n個(gè)兄弟節(jié)點(diǎn)
• 10. 封裝mychildren，解決瀏覽器的兼容問題
• 11. 判斷元素有沒有子元素
• 12. 一個(gè)元素插入到另一個(gè)元素的后面
• 13. 返回當(dāng)前的時(shí)間（年月日時(shí)分秒）
• 14. 獲得滾動(dòng)條的滾動(dòng)距離
• 15. 獲得視口的尺寸
• 16. 獲取任一元素的任意屬性
• 17. 綁定事件的兼容代碼
• 18. 解綁事件
• 19. 取消冒泡的兼容代碼
• 20. 檢驗(yàn)字符串是否是回文
• 21. 檢驗(yàn)字符串是否是回文
• 22. 兼容getElementsByClassName方法
• 23. 運(yùn)動(dòng)函數(shù)
• 24. 彈性運(yùn)動(dòng)
• 25. 封裝自己的forEach方法
• 26. 封裝自己的filter方法
• 27. 數(shù)組map方法
• 28. 數(shù)組every方法
• 29. 數(shù)組reduce方法
• 30. 獲取url中的參數(shù)
• 31. 數(shù)組排序
• 32. 遍歷Dom樹
• 33. 原生js封裝ajax
• 34. 異步加載script
• 35. Cookie管理
• 36. 實(shí)現(xiàn)bind()方法
• 37. 實(shí)現(xiàn)call()方法
• 38. 實(shí)現(xiàn)apply()方法
• 39. 防抖
• 40. 節(jié)流
• 41. requestAnimFrame兼容性方法
• 42. cancelAnimFrame兼容性方法
• 43. jsonp底層方法
• 44. 獲取url上的參數(shù)
• 45. 格式化時(shí)間
• 46. 驗(yàn)證郵箱的正則表達(dá)式
• 47. 函數(shù)柯里化
• 48. 大數(shù)相加
• 49. 單例模式

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1. 輸入一個(gè)值，返回其數(shù)據(jù)類型**

function type(para) {return Object.prototype.toString.call(para) }

2. 數(shù)組去重

function unique1(arr) {return [...new Set(arr)] } function unique2(arr) {var obj = {};return arr.filter(ele => {if (!obj[ele]) {obj[ele] = true;return true;}}) } function unique3(arr) {var result = [];arr.forEach(ele => {if (result.indexOf(ele) == -1) {result.push(ele)}})return result; }

3. 字符串去重

String.prototype.unique = function () {var obj = {},str = '',len = this.length;for (var i = 0; i < len; i++) {if (!obj[this[i]]) {str += this[i];obj[this[i]] = true;}}return str; } //去除連續(xù)的字符串 function uniq(str) {return str.replace(/(\w)\1+/g, '$1') }

4. 深拷貝 淺拷貝

//深克隆（深克隆不考慮函數(shù)） function deepClone(obj, result) {var result = result || {};for (var prop in obj) {if (obj.hasOwnProperty(prop)) {if (typeof obj[prop] == 'object' && obj[prop] !== null) {// 引用值(obj/array)且不為nullif (Object.prototype.toString.call(obj[prop]) == '[object Object]') {// 對(duì)象result[prop] = {};} else {// 數(shù)組result[prop] = [];}deepClone(obj[prop], result[prop])} else {// 原始值或funcresult[prop] = obj[prop]}} } return result; } // 深淺克隆是針對(duì)引用值 function deepClone(target) {if (typeof (target) !== 'object') {return target;}var result;if (Object.prototype.toString.call(target) == '[object Array]') {// 數(shù)組result = []} else {// 對(duì)象result = {};}for (var prop in target) {if (target.hasOwnProperty(prop)) {result[prop] = deepClone(target[prop])}}return result; } // 無法復(fù)制函數(shù) var o1 = jsON.parse(jsON.stringify(obj1));

5. reverse底層原理和擴(kuò)展

// 改變?cè)瓟?shù)組 Array.prototype.myReverse = function () {var len = this.length;for (var i = 0; i < len; i++) {var temp = this[i];this[i] = this[len - 1 - i];this[len - 1 - i] = temp;}return this; }

6. 圣杯模式的繼承

function inherit(Target, Origin) {function F() {};F.prototype = Origin.prototype;Target.prototype = new F();Target.prototype.constructor = Target;// 最終的原型指向Target.prop.uber = Origin.prototype; }

7. 找出字符串中第一次只出現(xiàn)一次的字母

String.prototype.firstAppear = function () {var obj = {},len = this.length;for (var i = 0; i < len; i++) {if (obj[this[i]]) {obj[this[i]]++;} else {obj[this[i]] = 1;}}for (var prop in obj) {if (obj[prop] == 1) {return prop;}} }

8. 找元素的第 n 級(jí)父元素

function parents(ele, n) {while (ele && n) {ele = ele.parentElement ? ele.parentElement : ele.parentNode;n--;}return ele; }

9. 返回元素的第n個(gè)兄弟節(jié)點(diǎn)

function retSibling(e, n) {while (e && n) {if (n > 0) {if (e.nextElementSibling) {e = e.nextElementSibling;} else {for (e = e.nextSibling; e && e.nodeType !== 1; e = e.nextSibling);}n--;} else {if (e.previousElementSibling) {e = e.previousElementSibling;} else {for (e = e.previousElementSibling; e && e.nodeType !== 1; e = e.previousElementSibling);}n++;}}return e; }

10. 封裝mychildren，解決瀏覽器的兼容問題

function myChildren(e) {var children = e.childNodes,arr = [],len = children.length;for (var i = 0; i < len; i++) {if (children[i].nodeType === 1) {arr.push(children[i])}}return arr; }

11. 判斷元素有沒有子元素

function hasChildren(e) {var children = e.childNodes,len = children.length;for (var i = 0; i < len; i++) {if (children[i].nodeType === 1) {return true;}}return false; }

12. 一個(gè)元素插入到另一個(gè)元素的后面

Element.prototype.insertAfter = function (target, elen) {var nextElen = elen.nextElenmentSibling;if (nextElen == null) {this.appendChild(target);} else {this.insertBefore(target, nextElen);} }

13. 返回當(dāng)前的時(shí)間（年月日時(shí)分秒）

function getDateTime() {var date = new Date(),year = date.getFullYear(),month = date.getMonth() + 1,day = date.getDate(),hour = date.getHours() + 1,minute = date.getMinutes(),second = date.getSeconds();month = checkTime(month);day = checkTime(day);hour = checkTime(hour);minute = checkTime(minute);second = checkTime(second);function checkTime(i) {if (i < 10) {i = "0" + i;}return i;}return "" + year + "年" + month + "月" + day + "日" + hour + "時(shí)" + minute + "分" + second + "秒" }

14. 獲得滾動(dòng)條的滾動(dòng)距離

function getScrollOffset() {if (window.pageXOffset) {return {x: window.pageXOffset,y: window.pageYOffset}} else {return {x: document.body.scrollLeft + document.documentElement.scrollLeft,y: document.body.scrollTop + document.documentElement.scrollTop}} }

15. 獲得視口的尺寸

function getViewportOffset() {if (window.innerWidth) {return {w: window.innerWidth,h: window.innerHeight}} else {// ie8及其以下if (document.compatMode === "BackCompat") {// 怪異模式return {w: document.body.clientWidth,h: document.body.clientHeight}} else {// 標(biāo)準(zhǔn)模式return {w: document.documentElement.clientWidth,h: document.documentElement.clientHeight}}} }

16. 獲取任一元素的任意屬性

function getStyle(elem, prop) {return window.getComputedStyle ? window.getComputedStyle(elem, null)[prop] : elem.currentStyle[prop] }

17. 綁定事件的兼容代碼

function addEvent(elem, type, handle) {if (elem.addEventListener) { //非ie和非ie9elem.addEventListener(type, handle, false);} else if (elem.attachEvent) { //ie6到ie8elem.attachEvent('on' + type, function () {handle.call(elem);})} else {elem['on' + type] = handle;} }

18. 解綁事件

function removeEvent(elem, type, handle) {if (elem.removeEventListener) { //非ie和非ie9elem.removeEventListener(type, handle, false);} else if (elem.detachEvent) { //ie6到ie8elem.detachEvent('on' + type, handle);} else {elem['on' + type] = null;} }

19. 取消冒泡的兼容代碼

function stopBubble(e) {if (e && e.stopPropagation) {e.stopPropagation();} else {window.event.cancelBubble = true;} }

20. 檢驗(yàn)字符串是否是回文

function isPalina(str) {if (Object.prototype.toString.call(str) !== '[object String]') {return false;}var len = str.length;for (var i = 0; i < len / 2; i++) {if (str[i] != str[len - 1 - i]) {return false;}}return true; }

21. 檢驗(yàn)字符串是否是回文

function isPalindrome(str) {str = str.replace(/\W/g, '').toLowerCase();console.log(str)return (str == str.split('').reverse().join('')) }

22. 兼容getElementsByClassName方法

Element.prototype.getElementsByClassName = Document.prototype.getElementsByClassName = function (_className) {var allDomArray = document.getElementsByTagName('*');var lastDomArray = [];function trimSpace(strClass) {var reg = /\s+/g;return strClass.replace(reg, ' ').trim()}for (var i = 0; i < allDomArray.length; i++) {var classArray = trimSpace(allDomArray[i].className).split(' ');for (var j = 0; j < classArray.length; j++) {if (classArray[j] == _className) {lastDomArray.push(allDomArray[i]);break;}}}return lastDomArray; }

23. 運(yùn)動(dòng)函數(shù)

function animate(obj, json, callback) {clearInterval(obj.timer);var speed,current;obj.timer = setInterval(function () {var lock = true;for (var prop in json) {if (prop == 'opacity') {current = parseFloat(window.getComputedStyle(obj, null)[prop]) * 100;} else {current = parseInt(window.getComputedStyle(obj, null)[prop]);}speed = (json[prop] - current) / 7;speed = speed > 0 ? Math.ceil(speed) : Math.floor(speed);if (prop == 'opacity') {obj.style[prop] = (current + speed) / 100;} else {obj.style[prop] = current + speed + 'px';}if (current != json[prop]) {lock = false;}}if (lock) {clearInterval(obj.timer);typeof callback == 'function' ? callback() : '';}}, 30) }

24. 彈性運(yùn)動(dòng)

function ElasticMovement(obj, target) {clearInterval(obj.timer);var iSpeed = 40,a, u = 0.8;obj.timer = setInterval(function () {a = (target - obj.offsetLeft) / 8;iSpeed = iSpeed + a;iSpeed = iSpeed * u;if (Math.abs(iSpeed) <= 1 && Math.abs(a) <= 1) {console.log('over')clearInterval(obj.timer);obj.style.left = target + 'px';} else {obj.style.left = obj.offsetLeft + iSpeed + 'px';}}, 30); }

25. 封裝自己的forEach方法

Array.prototype.myForEach = function (func, obj) {var len = this.length;var _this = arguments[1] ? arguments[1] : window;// var _this=arguments[1]||window;for (var i = 0; i < len; i++) {func.call(_this, this[i], i, this)} }

26. 封裝自己的filter方法

Array.prototype.myFilter = function (func, obj) {var len = this.length;var arr = [];var _this = arguments[1] || window;for (var i = 0; i < len; i++) {func.call(_this, this[i], i, this) && arr.push(this[i]);}return arr; }

27. 數(shù)組map方法

Array.prototype.myMap = function (func) {var arr = [];var len = this.length;var _this = arguments[1] || window;for (var i = 0; i < len; i++) {arr.push(func.call(_this, this[i], i, this));}return arr; }

28. 數(shù)組every方法

Array.prototype.myEvery = function (func) {var flag = true;var len = this.length;var _this = arguments[1] || window;for (var i = 0; i < len; i++) {if (func.apply(_this, [this[i], i, this]) == false) {flag = false;break;}}return flag; }

29. 數(shù)組reduce方法

Array.prototype.myReduce = function (func, initialValue) {var len = this.length,nextValue,i;if (!initialValue) {// 沒有傳第二個(gè)參數(shù)nextValue = this[0];i = 1;} else {// 傳了第二個(gè)參數(shù)nextValue = initialValue;i = 0;}for (; i < len; i++) {nextValue = func(nextValue, this[i], i, this);}return nextValue; }

30. 獲取url中的參數(shù)

function getWindonHref() {var sHref = window.location.href;var args = sHref.split('?');if (args[0] === sHref) {return '';}var hrefarr = args[1].split('#')[0].split('&');var obj = {};for (var i = 0; i < hrefarr.length; i++) {hrefarr[i] = hrefarr[i].split('=');obj[hrefarr[i][0]] = hrefarr[i][1];}return obj; }

31. 數(shù)組排序

// 快排 [left] + min + [right] function quickArr(arr) {if (arr.length <= 1) {return arr;}var left = [],right = [];var pIndex = Math.floor(arr.length / 2);var p = arr.splice(pIndex, 1)[0];for (var i = 0; i < arr.length; i++) {if (arr[i] <= p) {left.push(arr[i]);} else {right.push(arr[i]);}}// 遞歸return quickArr(left).concat([p], quickArr(right)); } // 冒泡 function bubbleSort(arr) {for (var i = 0; i < arr.length - 1; i++) {for (var j = i + 1; j < arr.length; j++) {if (arr[i] > arr[j]) {var temp = arr[i];arr[i] = arr[j];arr[j] = temp;}}}return arr; } function bubbleSort(arr) {var len = arr.length;for (var i = 0; i < len - 1; i++) {for (var j = 0; j < len - 1 - i; j++) {if (arr[j] > arr[j + 1]) {var temp = arr[j];arr[j] = arr[j + 1];arr[j + 1] = temp;}}}return arr; }

32. 遍歷Dom樹

給定頁面上的DOM元素，將訪問元素本身及其所有后代(不僅僅是它的直接子元素)
對(duì)于每個(gè)訪問的元素，函數(shù)講元素傳遞給提供的回調(diào)函數(shù)

function traverse(element, callback) {callback(element);var list = element.children;for (var i = 0; i < list.length; i++) {traverse(list[i], callback);} }

33. 原生js封裝ajax

function ajax(method, url, callback, data, flag) {var xhr;flag = flag || true;method = method.toUpperCase();if (window.XMLHttpRequest) {xhr = new XMLHttpRequest();} else {xhr = new ActiveXObject('Microsoft.XMLHttp');}xhr.onreadystatechange = function () {if (xhr.readyState == 4 && xhr.status == 200) {console.log(2)callback(xhr.responseText);}}if (method == 'GET') {var date = new Date(),timer = date.getTime();xhr.open('GET', url + '?' + data + '&timer' + timer, flag);xhr.send()} else if (method == 'POST') {xhr.open('POST', url, flag);xhr.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');xhr.send(data);} }

34. 異步加載script

function loadScript(url, callback) {var oscript = document.createElement('script');if (oscript.readyState) { // ie8及以下版本oscript.onreadystatechange = function () {if (oscript.readyState === 'complete' || oscript.readyState === 'loaded') {callback();}}} else {oscript.onload = function () {callback()};}oscript.src = url;document.body.appendChild(oscript); }

35. Cookie管理

var cookie = {set: function (name, value, time) {document.cookie = name + '=' + value + '; max-age=' + time;return this;},remove: function (name) {return this.setCookie(name, '', -1);},get: function (name, callback) {var allCookieArr = document.cookie.split('; ');for (var i = 0; i < allCookieArr.length; i++) {var itemCookieArr = allCookieArr[i].split('=');if (itemCookieArr[0] === name) {return itemCookieArr[1]}}return undefined;} }

36. 實(shí)現(xiàn)bind()方法

Function.prototype.myBind = function (target) {var target = target || window;var _args1 = [].slice.call(arguments, 1);var self = this;var temp = function () {};var F = function () {var _args2 = [].slice.call(arguments, 0);var parasArr = _args1.concat(_args2);return self.apply(this instanceof temp ? this : target, parasArr)}temp.prototype = self.prototype;F.prototype = new temp();return F; }

37. 實(shí)現(xiàn)call()方法

Function.prototype.myCall = function () {var ctx = arguments[0] || window;ctx.fn = this;var args = [];for (var i = 1; i < arguments.length; i++) {args.push(arguments[i])}var result = ctx.fn(...args);delete ctx.fn;return result; }

38. 實(shí)現(xiàn)apply()方法

Function.prototype.myApply = function () {var ctx = arguments[0] || window;ctx.fn = this;if (!arguments[1]) {var result = ctx.fn();delete ctx.fn;return result;}var result = ctx.fn(...arguments[1]);delete ctx.fn;return result; }

39. 防抖

function debounce(handle, delay) {var timer = null;return function () {var _self = this,_args = arguments;clearTimeout(timer);timer = setTimeout(function () {handle.apply(_self, _args)}, delay)} }

40. 節(jié)流

function throttle(handler, wait) {var lastTime = 0;return function (e) {var nowTime = new Date().getTime();if (nowTime - lastTime > wait) {handler.apply(this, arguments);lastTime = nowTime;}} }

41. requestAnimFrame兼容性方法

window.requestAnimFrame = (function () {return window.requestAnimationFrame ||window.webkitRequestAnimationFrame ||window.mozRequestAnimationFrame ||function (callback) {window.setTimeout(callback, 1000 / 60);}; })();

42. cancelAnimFrame兼容性方法

window.cancelAnimFrame = (function () {return window.cancelAnimationFrame ||window.webkitCancelAnimationFrame ||window.mozCancelAnimationFrame ||function (id) {window.clearTimeout(id);}; })();

43. jsonp底層方法

function jsonp(url, callback) {var oscript = document.createElement('script');if (oscript.readyState) { // ie8及以下版本oscript.onreadystatechange = function () {if (oscript.readyState === 'complete' || oscript.readyState === 'loaded') {callback();}}} else {oscript.onload = function () {callback()};}oscript.src = url;document.body.appendChild(oscript); }

44. 獲取url上的參數(shù)

function getUrlParam(sUrl, sKey) {var result = {};sUrl.replace(/(\w+)=(\w+)(?=[&|#])/g, function (ele, key, val) {if (!result[key]) {result[key] = val;} else {var temp = result[key];result[key] = [].concat(temp, val);}})if (!sKey) {return result;} else {return result[sKey] || '';} }

45. 格式化時(shí)間

function formatDate(t, str) {var obj = {yyyy: t.getFullYear(),yy: ("" + t.getFullYear()).slice(-2),M: t.getMonth() + 1,MM: ("0" + (t.getMonth() + 1)).slice(-2),d: t.getDate(),dd: ("0" + t.getDate()).slice(-2),H: t.getHours(),HH: ("0" + t.getHours()).slice(-2),h: t.getHours() % 12,hh: ("0" + t.getHours() % 12).slice(-2),m: t.getMinutes(),mm: ("0" + t.getMinutes()).slice(-2),s: t.getSeconds(),ss: ("0" + t.getSeconds()).slice(-2),w: ['日', '一', '二', '三', '四', '五', '六'][t.getDay()]};return str.replace(/([a-z]+)/ig, function ($1) {return obj[$1]}); }

46. 驗(yàn)證郵箱的正則表達(dá)式

function isAvailableEmail(sEmail) {var reg = /^([\w+\.])+@\w+([.]\w+)+$/return reg.test(sEmail) }

47. 函數(shù)柯里化

是把接受多個(gè)參數(shù)的函數(shù)變換成接受一個(gè)單一參數(shù)（最初函數(shù)的第一個(gè)參數(shù)）的函數(shù)，并且返回接受余下的參數(shù)且返回結(jié)果的新函數(shù)的技術(shù)

function curryIt(fn) {var length = fn.length,args = [];var result = function (arg) {args.push(arg);length--;if (length <= 0) {return fn.apply(this, args);} else {return result;}}return result; }

48. 大數(shù)相加

function sumBigNumber(a, b) {var res = '', //結(jié)果temp = 0; //按位加的結(jié)果及進(jìn)位a = a.split('');b = b.split('');while (a.length || b.length || temp) {//~~按位非 1.類型轉(zhuǎn)換，轉(zhuǎn)換成數(shù)字 2.~~undefined==0 temp += ~~a.pop() + ~~b.pop();res = (temp % 10) + res;temp = temp > 9;}return res.replace(/^0+/, ''); }

49. 單例模式

function getSingle(func) {var result;return function () {if (!result) {result = new func(arguments);}return result;} }

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