详解JS中Array对象扩展与String对象扩展

/*** Created by laixiangran on 2016/01/07.* Array扩展*/(function() {// 遍历数组if (typeof Array.prototype.forEach != "function") {Array.prototype.forEach = function (fn, context) {for (var i = 0; i < this.length; i++) {if (typeof fn === "function" && Object.prototype.hasOwnProperty.call(this, i)) {fn.call(context, this[i], i, this);}}};}// 让数组中的每一个元素调用给定的函数，然后把得到的结果放到新数组中返回if (typeof Array.prototype.map != "function") {Array.prototype.map = function (fn, context) {var arr = [];if (typeof fn === "function") {for (var k = 0, length = this.length; k < length; k++) {arr.push(fn.call(context, this[k], k, this));}}return arr;};}// 把符合条件的元素放到一个新数组中返回if (typeof Array.prototype.filter != "function") {Array.prototype.filter = function (fn, context) {var arr = [];if (typeof fn === "function") {for (var k = 0, length = this.length; k < length; k++) {fn.call(context, this[k], k, this) && arr.push(this[k]);}}return arr;};}// 如果数组中的每个元素都能通过给定的函数的测试，则返回true，反之falseif (typeof Array.prototype.every != "function") {Array.prototype.every = function (fn, context) {var passed = true;if (typeof fn === "function") {for (var k = 0, length = this.length; k < length; k++) {if (passed === false) break;passed = !!fn.call(context, this[k], k, this);}}return passed;};}// 类似every函数，但只要有一个通过给定函数的测试就返回trueif (typeof Array.prototype.some != "function") {Array.prototype.some = function (fn, context) {var passed = false;if (typeof fn === "function") {for (var k = 0, length = this.length; k < length; k++) {if (passed === true) break;passed = !!fn.call(context, this[k], k, this);}}return passed;};}// 返回元素在数组的索引，没有则返回-1，从左到右if (typeof Array.prototype.indexOf != "function") {Array.prototype.indexOf = function (item, index) {var n = this.length,i = index == null ? 0 : index < 0 ? Math.max(0, n + index) : index;for (; i < n; i++) {if (i in this && this[i] === item) {return i}}return -1};}// 返回元素在数组的索引，没有则返回-1，从右到左if (typeof Array.prototype.lastIndexOf != "function") {Array.prototype.lastIndexOf = function (item, index) {var n = this.length,i = index == null ? n-1 : index < 0 ? Math.max(0, n + index) : index;for (; i >= 0; i--) {if (i in this && this[i] === item) {return i;}}return -1;};}// 让数组元素依次调用给定函数，最后返回一个值（从左到右）if (typeof Array.prototype.reduce != "function") {Array.prototype.reduce = function (callback, initialValue) {var previous = initialValue, k = 0, length = this.length;if (typeof initialValue === "undefined") {previous = this[0];k = 1;}if (typeof callback === "function") {for (k; k < length; k++) {this.hasOwnProperty(k) && (previous = callback(previous, this[k], k, this));}}return previous;};}// 让数组元素依次调用给定函数，最后返回一个值（从右到左）if (typeof Array.prototype.reduceRight != "function") {Array.prototype.reduceRight = function (callback, initialValue) {var length = this.length, k = length - 1, previous = initialValue;if (typeof initialValue === "undefined") {previous = this[length - 1];k--;}if (typeof callback === "function") {for (k; k > -1; k-=1) {this.hasOwnProperty(k) && (previous = callback(previous, this[k], k, this));}}return previous;};}// 去掉重复项（唯一性），返回新数组if (typeof Array.prototype.uniq != "function") {Array.prototype.uniq = function() {var arr = [];arr[0] = this[0];for (var i = 1; i < this.length; i++) {if (arr.indexOf(this[i]) == -1) {arr.push(this[i]);}}return arr;};}// 指定删除数组中某值if (typeof Array.prototype.remove != "function") {Array.prototype.remove = function(item) {for (var i = this.length; i >= 0; i--) {if (item === this[i]) {this.splice(i, 1);}}return this;};}// 打乱数组顺序if (typeof Array.prototype.shuffle != "function") {Array.prototype.shuffle = function() {var i = this.length;while (i) {var j = Math.floor(Math.random()*i);var t = this[--i];this[i] = this[j];this[j] = t;}return this;};}// 求数组的最大值if (typeof Array.prototype.max != "function") {Array.prototype.max = function() {return Math.max.apply({}, this)};}// 求数组的最小值if (typeof Array.prototype.max != "function") {Array.prototype.min = function() {return Math.min.apply({}, this)};} // 判断是否为数组if (typeof Array.prototype.isArray != "function") {Array.prototype.isArray = function() {return Object.prototype.toString.apply(this) === "[object Array]";};} }());

/*** Created by laixiangran on 2015/12/12.* String扩展*/(function() {// 十六进制颜色值的正则表达式var reg = /^#([0-9a-fA-f]{3}|[0-9a-fA-f]{6})$/;// RGB颜色转换为16进制if (typeof String.prototype.rgbToHex != "function") {String.prototype.rgbToHex = function() {var that = this;if (/^(rgb|RGB)/.test(that)) {var aColor = that.replace(/(?:/(|/)|rgb|RGB)*/g,"").split(",");var strHex = "#";for (var i=0; i<aColor.length; i++) {var hex = Number(aColor[i]).toString(16);if (hex === "0") {hex += hex;}strHex += hex;}if (strHex.length !== 7) {strHex = that;}return strHex;}else if (reg.test(that)) {var aNum = that.replace(/#/,"").split("");if (aNum.length === 6){return that;}else if (aNum.length === 3) {var numHex = "#";for (var j=0; j<aNum.length; j++) {numHex += (aNum[j]+aNum[j]);}return numHex;}}else{return that;}};}// 16进制颜色转为RGB格式if (typeof String.prototype.hexToRgb != "function") {String.prototype.hexToRgb = function() {var sColor = this.toLowerCase();if (sColor && reg.test(sColor)) {if (sColor.length === 4) {var sColorNew = "#";for (var i = 1; i < 4; i++) {sColorNew += sColor.slice(i,i+1).concat(sColor.slice(i,i+1));}sColor = sColorNew;}// 处理六位的颜色值var sColorChange = [];for (var j=1; j<7; j+=2) {sColorChange.push(parseInt("0x"+sColor.slice(j,j+2)));}return "RGB(" + sColorChange.join(",") + ")";}else{return sColor;}};}// 移除字符串首尾空白if (typeof String.prototype.trim != "function") {String.prototype.trim = function() {return this.replace(/^/s+|/s+$/g, "");};}}());