分享一段自己常用的扩展js基础类的方法
/** * 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;}/** * 扩展基础类 * 数组最大值 **/Array.prototype.max = function(field){var result = -1;var i = 0;for(; i < this.length; i++){var val = field ? this[i][field] : this[i];if(val > result)result = val;}return result;}/** * 扩展基础类 * 数组最小值 **/Array.prototype.min = function(field){var result = -1;var i = 0;for(; i < this.length; i++){var val = field ? this[i][field] : this[i];if(val < result)result = val;}return result;}/** * 扩展基础类 * 日期格式化 **/Date.prototype.format = function(pat){var year = this.getFullYear();var month = this.getMonth() + 1;var day = this.getDate();var hour = this.getHours();var minute = this.getMinutes();var second = this.getSeconds();// 两位补齐month = month > 9 ? month : "0" + month;day = day > 9 ? day : "0" + day;hour = hour > 9 ? hour : "0" + hour;minute = minute > 9 ? minute : "0" + minute;second = second > 9 ? second : "0" + second;if(!pat){pat = "yyyy-MM-dd";}pat = pat.replace(/yyyy/g, year);pat = pat.replace(/MM/g, month);pat = pat.replace(/dd/g, day);pat = pat.replace(/HH/gi, hour);pat = pat.replace(/mm/g, minute);pat = pat.replace(/ss/g, second);return pat;}// 减去时差的毫秒数（取决于使用的浏览器的locale设置）Date.prototype.getTime2 = function(){//return this.getTime();return this.getTime() - this.getTimezoneOffset() / 60 * 3600 * 1000;}// 日期相差天数Date.prototype.diff = function(date){return Math.ceil((this - date) / (1000 * 60 * 60 * 24));}// 日期加减计算Date.prototype.add = function(days){return new Date(this.getTime() + days * (1000 * 60 * 60 * 24));}// 日期加减计算Date.prototype.addMonth = function(months){var day = this.getDate();var month = this.getMonth() + 1;var year = this.getFullYear();month += months; if(month > 12){year += Math.floor(month / 12);month = month % 12;}return Date.parse(month + '/' + day + '/' + year);}// 解析字符串，以默认 pat = "yyyy-MM-dd"的格式，而不是MM/dd/yyyyDate.parse2 = function(str, pat){if(str == null || str == '')return new Date();var rstr = str.replace(/(\d{4})([-\./])(\d{1,2})\2(\d{1,2})/, "$3/$4/$1");return new Date(Date.parse(rstr));}// 解析字符串，json date obj// 减去时差的毫秒数（取决于使用的浏览器的locale设置）Date.parse3 = function(obj){//return new Date(obj.time);return new Date(obj.time - new Date().getTimezoneOffset() / 60 * 3600 * 1000);//var str = obj.year + '-' + (obj.month + 1) + '-' + obj.date + ' ' + //obj.hours + ':' + obj.minutes + ':' + obj.seconds;//return Date.parse2(str);}?
其中日期部分是为了和后台json-lib交互用，用了时间戳。