1、输入一个值，返回其数据类型**
type(para) {
return Object.prototype.toString.call(para);
}
2、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));
3、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;
}
4、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;
}
}
}
5、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;
}
6、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"
}
7、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
}
}
}
8、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
}
}
}
}
9、获取url中的参数
function getHref() {
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;
}
10、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)
}
}
11、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;
}
}
}
12、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;
}
13、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;
}
14、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;
}
15、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;
}
}
要么庸俗,要么孤独
