详解JS中Array对象扩展与String对象扩展_javascript技巧

废话不多说了，直接给大家上array对象扩展代码了，具体代码如下所示：

/**
* 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 = 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  -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 = 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]";
};
} 
}());

下面是string对象扩展代码如下所示：

/**
* 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