/** 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);
}