常用string原型扩展

Dear 丶 2022-06-12 03:52 166阅读 0赞

/** 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+$)/g, "");
    }
    /** 保留数字 **/ 
    String.prototype.getNum = function () {
        return this.replace(/[^d]/g, "");
    }
    /** 保留字母 **/ 
    String.prototype.getEn = function () {
        return this.replace(/[^A-Za-z]/g, "");
    }
    /** 保留中文 **/ 
    String.prototype.getCn = function () {
        return this.replace(/[^u4e00-u9fa5uf900-ufa2d]/g, "");
    }
    /** 得到字节长度 **/ 
    String.prototype.getRealLength = function () {
        return this.replace(/[^x00-xff]/g, "--").length;
    }
    /** 从左截取指定长度的字串 **/ 
    String.prototype.left = function (n) {
        return this.slice(0, n);
    }
    /** 从右截取指定长度的字串 **/ 
    String.prototype.right = function (n) {
        return this.slice(this.length - n);
    }
    /*** 删除首尾空格 ***/ 
    String.prototype.Trim = function() { 
      return this.replace(/(^\s*)|(\s*$)/g, ""); 
    } 
    
    /*** 统计指定字符出现的次数 ***/ 
    String.prototype.Occurs = function(ch) { 
    // var re = eval("/[^"+ch+"]/g"); 
    // return this.replace(re, "").length; 
      return this.split(ch).length-1; 
    } 
    
    /*** 检查是否由数字组成 ***/ 
    String.prototype.isDigit = function() { 
      var s = this.Trim(); 
      return (s.replace(/\d/g, "").length == 0); 
    } 
    
    /*** 检查是否由数字字母和下划线组成 ***/ 
    String.prototype.isAlpha = function() { 
      return (this.replace(/\w/g, "").length == 0); 
    } 
    
    /*** 检查是否为数 ***/ 
    String.prototype.isNumber = function() { 
      var s = this.Trim(); 
      return (s.search(/^[+-]?[0-9.]*$/) >= 0); 
    } 
    
    /*** 返回字节数 ***/ 
    String.prototype.lenb = function() { 
      return this.replace(/[^\x00-\xff]/g,"**").length; 
    } 
    
    /*** 检查是否包含汉字 ***/ 
    String.prototype.isInChinese = function() { 
      return (this.length != this.replace(/[^\x00-\xff]/g,"**").length); 
    } 
    
    /*** 简单的email检查 ***/ 
    String.prototype.isEmail = function() { 
    　var strr; 
      var mail = this; 
    　var re = /(\w+@\w+\.\w+)(\.{
       0,1}\w*)(\.{
       0,1}\w*)/i; 
    　re.exec(mail); 
    　if(RegExp.$3!="" && RegExp.$3!="." && RegExp.$2!=".") 
        strr = RegExp.$1+RegExp.$2+RegExp.$3; 
    　else 
    　　if(RegExp.$2!="" && RegExp.$2!=".") 
          strr = RegExp.$1+RegExp.$2; 
    　　else 
        　strr = RegExp.$1; 
    　return (strr==mail); 
    } 
    
    /*** 简单的日期检查，成功返回日期对象 ***/ 
    String.prototype.isDate = function() { 
      var p; 
      var re1 = /(\d{
       4})[年./-](\d{
       1,2})[月./-](\d{
       1,2})[日]?$/; 
      var re2 = /(\d{
       1,2})[月./-](\d{
       1,2})[日./-](\d{
       2})[年]?$/; 
      var re3 = /(\d{
       1,2})[月./-](\d{
       1,2})[日./-](\d{
       4})[年]?$/; 
      if(re1.test(this)) { 
        p = re1.exec(this); 
        return new Date(p[1],p[2],p[3]); 
      } 
      if(re2.test(this)) { 
        p = re2.exec(this); 
        return new Date(p[3],p[1],p[2]); 
      } 
      if(re3.test(this)) { 
        p = re3.exec(this); 
        return new Date(p[3],p[1],p[2]); 
      } 
      return false; 
    } 
    
    /*** 检查是否有列表中的字符字符 ***/ 
    String.prototype.isInList = function(list) { 
      var re = eval("/["+list+"]/"); 
      return re.test(this); 
    }
    
    
    
        /* * 系统中JS的扩展函数 * * */  
    
        // 清除两边的空格 
        String.prototype.trim = function() {  
            return this.replace(/(^\s*)|(\s*$)/g, '');  
        };  
        // 合并多个空白为一个空白 
        String.prototype.ResetBlank = function() {  
            var regEx = /\s+/g;  
            return this.replace(regEx, ' ');  
        };  
    
        // 保留数字 
        String.prototype.GetNum = function() {  
            var regEx = /[^\d]/g;  
            return this.replace(regEx, '');  
        };  
    
        // 保留中文 
        String.prototype.GetCN = function() {  
            var regEx = /[^\u4e00-\u9fa5\uf900-\ufa2d]/g;  
            return this.replace(regEx, '');  
        };  
    
        // String转化为Number 
        String.prototype.ToInt = function() {  
            return isNaN(parseInt(this)) ? this.toString() : parseInt(this);  
        };  
    
        // 得到字节长度 
        String.prototype.GetLen = function() {  
            var regEx = /^[\u4e00-\u9fa5\uf900-\ufa2d]+$/;  
            if (regEx.test(this)) {  
                return this.length * 2;  
            } else {  
                var oMatches = this.match(/[\x00-\xff]/g);  
                var oLength = this.length * 2 - oMatches.length;  
                return oLength;  
            }  
        };  
    
        // 获取文件全名 
        String.prototype.GetFileName = function() {  
            var regEx = /^.*\/([^\/\?]*).*$/;  
            return this.replace(regEx, '$1');  
        };  
    
        // 获取文件扩展名 
        String.prototype.GetExtensionName = function() {  
            var regEx = /^.*\/[^\/]*(\.[^\.\?]*).*$/;  
            return this.replace(regEx, '$1');  
        };  
    
        /******add By 刘景宁 2010-12-09 *******/  
        String.prototype.replaceAll = function(reallyDo, replaceWith, ignoreCase) {  
            if (!RegExp.prototype.isPrototypeOf(reallyDo)) {  
                return this.replace(new RegExp(reallyDo, (ignoreCase ? "gi" : "g")), replaceWith);  
            } else {  
                return this.replace(reallyDo, replaceWith);  
            }  
        };  
        //格式化字符串 add By 刘景宁 2010-12-09 
        String.Format = function() {  
            if (arguments.length == 0) {  
                return '';  
            }  
    
            if (arguments.length == 1) {  
                return arguments[0];  
            }  
    
            var reg = /{(\d+)?}/g;  
            var args = arguments;  
            var result = arguments[0].replace(reg, function($0, $1) {  
                return args[parseInt($1) + 1];  
            });  
            return result;  
        };  
    
        // 数字补零 
        Number.prototype.LenWithZero = function(oCount) {  
            var strText = this.toString();  
            while (strText.length < oCount) {  
                strText = '0' + strText;  
            }  
            return strText;  
        };  
    
        // Unicode还原 
        Number.prototype.ChrW = function() {  
            return String.fromCharCode(this);  
        };  
    
        // 数字数组由小到大排序 
        Array.prototype.Min2Max = function() {  
            var oValue;  
            for (var i = 0; i < this.length; i++) {  
                for (var j = 0; j <= i; j++) {  
                    if (this[i] < this[j]) {  
                        oValue = this[i];  
                        this[i] = this[j];  
                        this[j] = oValue;  
                    }  
                }  
            }  
            return this;  
        };  
    
        // 数字数组由大到小排序 
        Array.prototype.Max2Min = function() {  
            var oValue;  
            for (var i = 0; i < this.length; i++) {  
                for (var j = 0; j <= i; j++) {  
                    if (this[i] > this[j]) {  
                        oValue = this[i];  
                        this[i] = this[j];  
                        this[j] = oValue;  
                    }  
                }  
            }  
            return this;  
        };  
    
        // 获得数字数组中最大项 
        Array.prototype.GetMax = function() {  
            var oValue = 0;  
            for (var i = 0; i < this.length; i++) {  
                if (this[i] > oValue) {  
                    oValue = this[i];  
                }  
            }  
            return oValue;  
        };  
    
        // 获得数字数组中最小项 
        Array.prototype.GetMin = function() {  
            var oValue = 0;  
            for (var i = 0; i < this.length; i++) {  
                if (this[i] < oValue) {  
                    oValue = this[i];  
                }  
            }  
            return oValue;  
        };  
    
        // 获取当前时间的中文形式 
        Date.prototype.GetCNDate = function() {  
            var oDateText = '';  
            oDateText += this.getFullYear().LenWithZero(4) + new Number(24180).ChrW();  
            oDateText += this.getMonth().LenWithZero(2) + new Number(26376).ChrW();  
            oDateText += this.getDate().LenWithZero(2) + new Number(26085).ChrW();  
            oDateText += this.getHours().LenWithZero(2) + new Number(26102).ChrW();  
            oDateText += this.getMinutes().LenWithZero(2) + new Number(20998).ChrW();  
            oDateText += this.getSeconds().LenWithZero(2) + new Number(31186).ChrW();  
            oDateText += new Number(32).ChrW() + new Number(32).ChrW() + new Number(26143).ChrW() + new Number(26399).ChrW() + new String('26085199682010819977222352011620845').substr(this.getDay() * 5, 5).ToInt().ChrW();  
            return oDateText;  
        };  
        //扩展Date格式化 
        Date.prototype.Format = function(format) {  
            var o = {  
                "M+": this.getMonth() + 1, //月份 
                "d+": this.getDate(), //日 
                "h+": this.getHours() % 12 == 0 ? 12 : this.getHours() % 12, //小时 
                "H+": this.getHours(), //小时 
                "m+": this.getMinutes(), //分 
                "s+": this.getSeconds(), //秒 
                "q+": Math.floor((this.getMonth() + 3) / 3), //季度 
                "S": this.getMilliseconds() //毫秒 
            };  
            var week = {  
                "0": "\u65e5",  
                "1": "\u4e00",  
                "2": "\u4e8c",  
                "3": "\u4e09",  
                "4": "\u56db",  
                "5": "\u4e94",  
                "6": "\u516d"  
            };  
            if (/(y+)/.test(format)) {  
                format = format.replace(RegExp.$1, (this.getFullYear() + "").substr(4 - RegExp.$1.length));  
            }  
            if (/(E+)/.test(format)) {  
                format = format.replace(RegExp.$1, ((RegExp.$1.length > 1) ? (RegExp.$1.length > 2 ? "\u661f\u671f" : "\u5468") : "") + week[this.getDay() + ""]);  
            }  
            for (var k in o) {  
                if (new RegExp("(" + k + ")").test(format)) {  
                    format = format.replace(RegExp.$1, (RegExp.$1.length == 1) ? (o[k]) : (("00" + o[k]).substr(("" + o[k]).length)));  
                }  
            }  
            return format;  
        }  
        Date.prototype.Diff = function(interval, objDate) {  
            //若参数不足或 objDate 不是日期类型則回传 undefined 
            if (arguments.length < 2 || objDate.constructor != Date) { return undefined; }  
            switch (interval) {  
                //计算秒差 
                case 's': return parseInt((objDate - this) / 1000);  
                    //计算分差 
                case 'n': return parseInt((objDate - this) / 60000);  
                    //计算時差 
                case 'h': return parseInt((objDate - this) / 3600000);  
                    //计算日差 
                case 'd': return parseInt((objDate - this) / 86400000);  
                    //计算周差 
                case 'w': return parseInt((objDate - this) / (86400000 * 7));  
                    //计算月差 
                case 'm': return (objDate.getMonth() + 1) + ((objDate.getFullYear() - this.getFullYear()) * 12) - (this.getMonth() + 1);  
                    //计算年差 
                case 'y': return objDate.getFullYear() - this.getFullYear();  
                    //输入有误 
                default: return undefined;  
            }  
        };  
    
        //检测是否为空 
        Object.prototype.IsNullOrEmpty = function() {  
            var obj = this;  
            var flag = false;  
            if (obj == null || obj == undefined || typeof (obj) == 'undefined' || obj == '') {  
                flag = true;  
            } else if (typeof (obj) == 'string') {  
                obj = obj.trim();  
                if (obj == '') {
       //为空 
                    flag = true;  
                } else {
       //不为空 
                    obj = obj.toUpperCase();  
                    if (obj == 'NULL' || obj == 'UNDEFINED' || obj == '{}') {  
                        flag = true;  
                    }  
                }  
            }  
            else {  
                flag = false;  
            }  
            return flag;  
        };