1. 输入一个值，返回其数据类型
function type(para) {return Object.prototype.toString.call(para)
}2. 数组去重
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;
}
###### // 去除连续的字符串
function uniq(str) {return str.replace(/(\w)\1+/g, '$1')
}4. 深拷贝 浅拷贝
// 深克隆（深克隆不考虑函数）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) 且不为 null
if (Object.prototype.toString.call(obj[prop]) == '[object Object]') {
// 对象
result[prop] = {};} else {
// 数组
result[prop] = [];}
deepClone(obj[prop], result[prop])
} else {
// 原始值或 func
result[prop] = obj[prop]
}
}}
return result;
}
// 深浅克隆是针对引用值
function deepClone(target) {if (typeof (target) !== 'object') {return target;}
var result;
if (Object.prototype.toString.call(target) == '[object Array]') {
// 数组
result = []} else {
// 对象
result = {};}
for (var prop in target) {if (target.hasOwnProperty(prop)) {result[prop] = deepClone(target[prop])
}
}
return result;
}
// 无法复制函数
var o1 = JSON.parse(JSON.stringify(obj1));5.reverse 底层原理和扩展
// 改变原数组
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. 圣杯模式的继承
function inherit(Target, Origin) {function F() {};
F.prototype = Origin.prototype;
Target.prototype = new F();
Target.prototype.constructor = Target;
// 最终的原型指向
Target.prop.uber = Origin.prototype;
}7. 找出字符串中第一次只出现一次的字母
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 级父元素
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 个兄弟节点
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. 封装 mychildren，解决浏览器的兼容问题
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. 判断元素有没有子元素
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. 我一个元素插入到另一个元素的后面
Element.prototype.insertAfter = function (target, elen) {
var nextElen = elen.nextElenmentSibling;
if (nextElen == null) {this.appendChild(target);
} else {this.insertBefore(target, nextElen);
}
}13. 返回当前的时间（年月日时分秒）
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 + “ 时 ” + minute + “ 分 ” + second + “ 秒 ”
}14. 获得滚动条的滚动距离
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. 获得视口的尺寸
function getViewportOffset() {if (window.innerWidth) {
return {
w: window.innerWidth,
h: window.innerHeight
}
} else {
// ie8 及其以下
if (document.compatMode === "BackCompat") {
// 怪异模式
return {
w: document.body.clientWidth,
h: document.body.clientHeight
}
} else {
// 标准模式
return {
w: document.documentElement.clientWidth,
h: document.documentElement.clientHeight
}
}
}
}16. 获取任一元素的任意属性
function getStyle(elem, prop) {return window.getComputedStyle ? window.getComputedStyle(elem, null)[prop] : elem.currentStyle[prop]
}17. 绑定事件的兼容代码
function addEvent(elem, type, handle) {if (elem.addEventListener) { // 非 ie 和非 ie9
elem.addEventListener(type, handle, false);
} else if (elem.attachEvent) { //ie6 到 ie8
elem.attachEvent('on' + type, function () {handle.call(elem);
})
} else {elem['on' + type] = handle;
}
}18. 解绑事件
function removeEvent(elem, type, handle) {if (elem.removeEventListener) { // 非 ie 和非 ie9
elem.removeEventListener(type, handle, false);
} else if (elem.detachEvent) { //ie6 到 ie8
elem.detachEvent('on' + type, handle);
} else {elem['on' + type] = null;
}
}19. 取消冒泡的兼容代码
function stopBubble(e) {if (e && e.stopPropagation) {e.stopPropagation();
} else {window.event.cancelBubble = true;}
}20. 检验字符串是否是回文
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. 检验字符串是否是回文
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. 运动函数
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. 弹性运动
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. 封装自己的 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. 封装自己的 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. 数组 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. 数组 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. 数组 reduce 方法
Array.prototype.myReduce = function (func, initialValue) {
var len = this.length,
nextValue,
i;
if (!initialValue) {
// 没有传第二个参数
nextValue = this[0];
i = 1;
} else {
// 传了第二个参数
nextValue = initialValue;
i = 0;
}
for (; i < len; i++) {nextValue = func(nextValue, this[i], i, this);
}
return nextValue;
}30. 获取 url 中的参数
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. 数组排序
// 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]);
}
}
// 递归
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. 遍历 Dom 树
// 给定页面上的 DOM 元素, 将访问元素本身及其所有后代(不仅仅是它的直接子元素)
// 对于每个访问的元素，函数讲元素传递给提供的回调函数
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 封装 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. 异步加载 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. 实现 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. 实现 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. 实现 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. 节流
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 底层方法
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. 获取 url 上的参数
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. 格式化时间
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[$1]
});
}46. 验证邮箱的正则表达式
function isAvailableEmail(sEmail) {var reg = /^([\w+\.])+@\w+([.]\w+)+$/
return reg.test(sEmail)
}47. 函数柯里化
// 是把接受多个参数的函数变换成接受一个单一参数 (最初函数的第一个参数) 的函数，并且返回接受余下的参数且返回结果的新函数的技术
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. 大数相加
function sumBigNumber(a, b) {
var res = '', // 结果
temp = 0; // 按位加的结果及进位
a = a.split('');
b = b.split('');
while (a.length || b.length || temp) {
//~~ 按位非 1. 类型转换，转换成数字 2.~~undefined==0
temp += ~~a.pop() + ~~b.pop();
res = (temp % 10) + res;
temp = temp > 9;
}
return res.replace(/^0+/, '');
}49. 单例模式
function getSingle(func) {
var result;
return function () {if (!result) {result = new func(arguments);
}
return result;
}
## }