/**
		 * 扩展基础类
		 * 得到字符串的长度，包括中文和英文
		 **/
		String.prototype.charlen = function() {
			var arr = this.match(/[^\x00-\xff]/ig);
			return this.length + (arr == null ? 0 : arr.length);
		}

		/**
		 * 扩展基础类
		 * 格式化字符串${0} -> 参考printf %s
		 **/
		String.prototype.format = function() {
			var args = arguments;
			return this.replace(/\$\{(\d+)\}/g,              
				function(m, i){
					return args[i];
				});
		} 

		/**
		 * 扩展基础类
		 * 字符串首尾去空格
		 **/
		String.prototype.trim = function() {
			return this.replace(/(^\s*)|(\s*$)/g, "");
		}

		/**
		 * 扩展基础类
		 * 字符串包含字符串判断
		 **/
		String.prototype.contains = function(sub) {
			return this.indexOf(sub) != -1;
		}

		/**
		 * 扩展基础类
		 * 字符串比较大小
		 **/
		String.prototype.compare = function(b) {
			if(!b)
				return -1;

			if(this.length != b.length)
				return this.length - b.length;

			var i = 0;
			for (; i < this.length; i++){
				var val = this.charCodeAt(i) - b.charCodeAt(i);
				if(val != 0)
					return val;
			}

			return 0;
		}

		/**
		 * 扩展基础类
		 * 替换字符
		 **/
		String.prototype.replaceLen = function(start, len, replaced) {
			if(!len)
				return this;

			if(start >= this.length)
				return this;

			var returnSeg = '';
			var returnSeg2 = '';
			var i = 0;
			for (; i < this.length; i++){
				var c = this.charAt(i);
				if(i < start)
					returnSeg += c;

				if(i >= start + len)
					returnSeg2 += c;
			}

			return returnSeg + replaced + returnSeg2;
		}

		/**
		 * 扩展基础类
		 * 替换字符，这个在替换填入比较有用，比如***天***小时 替换为 <input />天<input />小时
		 **/
		String.prototype.replaceChar = function(target, replaced, start) {
			if(!target)
				return this;

			if(!start)
				start = 0;

			var returnVal = this.substring(0, start);
			var index = 0;
			for (var i = start; i < this.length; i++) {
				var c = this.charAt(i);
				target = typeof target == 'function' ? target.call(this, index) : target;
				if (c == target) {
					returnVal += typeof replaced == 'function' ? replaced.call(this, index) : replaced;
					while (i < this.length - 1 && this.charAt(i + 1) == c) {
						i++;
					}
					index++;
				}else{
					returnVal += c;
				}
			}

			return returnVal;
		}

		/**
		 * 扩展基础类
		 * 克隆复制（简单copy而已）
		 **/
		Array.prototype.clone = function(){
			var arr = [];
			var i = 0;
			for(; i < this.length; i++){
				switch(typeof this[i]){
					case 'object':
						var obj = {};
						for(key in this[i])
							obj[key] = this[i][key];
						arr.push(obj);
						break;
					default:
						arr.push(this[i]);
						break;
				}
			}
			return arr;
		}

		/**
		 * 扩展基础类
		 * 清空
		 **/
		Array.prototype.clear = function() {
			this.splice(0, this.length);
		}

		/**
		 * 扩展基础类
		 * 数组包含元素
		 **/
		Array.prototype.contains = function(el) {
			var i;
			for(i = 0; i < this.length; i++) {  
				if(this[i] == el)  
					return true;  
			}  
			return false;  
		}

		/**
		 * 扩展基础类
		 * 数组添加数组
		 **/
		Array.prototype.merge = function(arr) {
			if(arr){
				var i;
				for(i = 0; i < arr.length; i++) {  
					this.push(arr[i]);
				}  
			}
		}

		/**
		 * 扩展基础类
		 * 根据值和属性获取到数组的对象下标
		 **/
		Array.prototype.indexOf = function(val, field){
			var i = 0;
			for(; i < this.length; i++){
				if(this[i] && (field ? this[i][field] == val : this[i] == val)){
					return i;
				}
			}
			return -1;
		}

		/**
		 * 扩展基础类
		 * 最后一个下标
		 **/
		Array.prototype.lastIndexOf = function(val, field){
			var i = 0;
			var max = -1;
			for(; i < this.length; i++){
				if(this[i] && (field ? this[i][field] == val : this[i] == val)){
					max = i;
				}
			}
			return max;
		}

		/**
		 * 扩展基础类
		 * 数组唯一
		 **/
		Array.prototype.unique = function(field){
			var arr = [];

			var i = 0;
			for(; i < this.length; i++){
				var val = field ? this[i][field] : this[i];
				var index = this.lastIndexOf(val, field);
				if(index == i)
					arr.push(this[i]);
			}

			return arr;
		}