# 封装一些有用的方法

### 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) {
} 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');``

}

``````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.send(data);``````

}

``````
}``````

### 34.异步加载script

``````function loadScript(url, callback) {
var oscript = document.createElement('script');
callback();
}
}
} else {
callback()
};
}
oscript.src = url;
document.body.appendChild(oscript);
}``````

``````var cookie = {
set: function (name, value, time) {
document.cookie = name + '=' + value + '; max-age=' + time;
return this;
},
remove: function (name) {
},
get: function (name, callback) {
for (var i = 0; i < allCookieArr.length; i++) {
}
}
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');
callback();
}
}
} else {
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;
}

## }``````