/** 在字符串末尾追加字符串 **/String.prototype.append = function (str) {    return this.concat(str);}/** 删除指定索引位置的字符，索引无效将不删除任何字符 **/String.prototype.deleteCharAt = function (index) {    if (index < 0 || index >= this.length) {        return this.valueOf();    }    else if (index == 0) {        return this.substring(1, this.length);    }    else if (index == this.length - 1) {        return this.substring(0, this.length - 1);    }    else {        return this.substring(0, index) + this.substring(index + 1);    }}/** 删除指定索引区间的字符串 **/String.prototype.deleteString = function (start, end) {    if (start == end) {        return this.deleteCharAt(start);    }    else {        if (start > end) {            var temp = start;            start = end;            end = temp;        }        if (start < 0) {            start = 0;        }        if (end > this.length - 1) {            end = this.length - 1;        }        return this.substring(0, start) + this.substring(end +1 , this.length);    }}/** 检查字符串是否以subStr结尾 **/String.prototype.endWith = function (subStr) {    if (subStr.length > this.length) {        return false;    }    else {        return (this.lastIndexOf(subStr) == (this.length - subStr.length)) ? true : false;    }}/** 比较两个字符串是否相等，也可以直接用 == 进行比较 **/String.prototype.equal = function (str) {    if (this.length != str.length) {        return false;    }    else {        for (var i = 0; i < this.length; i++) {            if (this.charAt(i) != str.charAt(i)) {                return false;            }        }        return true;    }}/** 比较两个字符串是否相等，不区分大小写 **/String.prototype.equalIgnoreCase = function (str) {    var temp1 = this.toLowerCase();    var temp2 = str.toLowerCase();    return temp1.equal(temp2);}/** 将指定的字符串插入到指定的位置后面，索引无效将直接追加到字符串的末尾 **/String.prototype.insert = function (ofset, subStr) {    if (ofset < 0 || ofset >= this.length - 1) {        return this.append(subStr);    }    return this.substring(0, ofset + 1) + subStr + this.substring(ofset + 1);}/** 判断字符串是否数字串 **/String.prototype.isAllNumber = function () {    for (var i = 0; i < this.length; i++) {        if (this.charAt(i) < ‘0‘ || this.charAt(i) > ‘9‘) {            return false;        }    }    return true;}/** 将字符串反序排列 **/String.prototype.reserve = function () {    var temp = "";    for (var i = this.length - 1; i >= 0; i--) {        temp = temp.concat(this.charAt(i));    }    return temp;}/** 将指定的位置的字符设置为另外指定的字符或字符串.索引无效将直接返回不做任何处理 **/String.prototype.setCharAt = function (index, subStr) {    if (index < 0 || index > this.length - 1) {        return this.valueOf();    }    return this.substring(0, index) + subStr + this.substring(index+1);}/** 检查字符串是否以subStr开头 **/String.prototype.startWith = function (subStr) {    if (subStr.length > this.length) {        return false;    }    return (this.indexOf(subStr) == 0) ? true : false;}/** 计算长度，每个汉字占两个长度，英文字符每个占一个长度 **/String.prototype.charLength = function () {    var temp = 0;    for (var i = 0; i < this.length; i++) {        if (this.charCodeAt(i) > 255) {            temp += 2;        }        else {            temp += 1;        }    }    return temp;}String.prototype.charLengthReg = function () {    return this.replace(/[^\x00-\xff]/g, "**").length;}/** 去掉首尾空格 **/String.prototype.trim = function () {    return this.replace(/(^\s*)|(\s*$)/g, "");}/** 测试是否是数字 **/String.prototype.isNumeric = function () {    var tmpFloat = parseFloat(this);    if (isNaN(tmpFloat))        return false;    var tmpLen = this.length - tmpFloat.toString().length;    return tmpFloat + "0".Repeat(tmpLen) == this;}/** 测试是否是整数 **/ String.prototype.isInt = function () {    if (this == "NaN")        return false;    return this == parseInt(this).toString();}/** 获取N个相同的字符串 **/String.prototype.Repeat = function (num) {    var tmpArr = [];    for (var i = 0; i < num; i++) tmpArr.push(this);    return tmpArr.join("");}/** 合并多个空白为一个空白 **/ String.prototype.resetBlank = function () {    return this.replace(/s+/g, " ");}/** 除去左边空白 **/ String.prototype.LTrim = function () {    return this.replace(/^s+/g, "");}/** 除去右边空白 **/ String.prototype.RTrim = function () {    return this.replace(/s+$/g, "");}/** 除去两边空白 **/ String.prototype.trim = function () {    return this.replace(/(^s+)|(s+$)/g, "");}/** 保留数字 **/ String.prototype.getNum = function () {    return this.replace(/[^d]/g, "");}/** 保留字母 **/ String.prototype.getEn = function () {    return this.replace(/[^A-Za-z]/g, "");}/** 保留中文 **/ String.prototype.getCn = function () {    return this.replace(/[^u4e00-u9fa5uf900-ufa2d]/g, "");}/** 得到字节长度 **/ String.prototype.getRealLength = function () {    return this.replace(/[^x00-xff]/g, "--").length;}/** 从左截取指定长度的字串 **/ String.prototype.left = function (n) {    return this.slice(0, n);}/** 从右截取指定长度的字串 **/ String.prototype.right = function (n) {    return this.slice(this.length - n);}