JavaScript String Object Extension method

/** appends the string to the end of the string **/string.prototype.append = function (str) {return this.concat (str);} /** Delete the character at the specified index, invalid index will not remove any characters **/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); }}/** Delete the string of the specified index interval **/string.prototype.deletestring = function (start, end) {if (start = = end) {return this.de    Letecharat (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);   }}/** checks if the string ends with subStr **/string.prototype.endwith = function (subStr) {if (Substr.length > This.length) {    return false;    } else {return (This.lastindexof (subStr) = = (This.length-substr.length))? True:false; }}/** compares two strings for equality, or you can compare them directly with = = **/string.prototype.equal = function (str) {if (this.length! = str.length) {R    Eturn false;                } else {for (var i = 0; i < this.length; i++) {if (This.charat (i)! = Str.charat (i)) {            return false;    }} return true;    }}/** compares two strings for equality, case insensitive **/string.prototype.equalignorecase = function (str) {var temp1 = this.tolowercase ();    var temp2 = Str.tolowercase (); Return temp1.equal (TEMP2);} /** inserts the specified string after the specified position, an invalid index is appended directly to the end of the string **/string.prototype.insert = function (Ofset, SUBSTR) {if (Ofset < 0 | | ofse    T >= this.length-1) {return this.append (SUBSTR); } return this.substring (0, Ofset + 1) + SubStr + This.substriNg (Ofset + 1);} /** determines whether a string is a number string **/string.prototype.isallnumber = function () {for (var i = 0; i < this.length; i++) {if (th Is.charat (i) < ' 0 ' | |        This.charat (i) > ' 9 ') {return false; }} return true;    /** the string in reverse order **/string.prototype.reserve = function () {var temp = "";    for (var i = this.length-1; I >= 0; i--) {temp = Temp.concat (This.charat (i)); } return temp;}  /** sets the character of the specified position to another specified character or string. Invalid index will return directly without doing any processing **/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);} /** checks if the string starts with subStr **/string.prototype.startwith = function (subStr) {if (Substr.length > This.length) {r    Eturn false; } return (This.indexof (subStr) = = 0)? True:false;}    /** calculates the length, each Chinese character occupies two length, the English character each occupies one length **/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; /** Remove the trailing space **/string.prototype.trim = function () {return this.replace (/(^\s*) | ( \s*$)/g, "");}    /** test whether the number **/string.prototype.isnumeric = function () {var tmpfloat = parsefloat (this);    if (IsNaN (Tmpfloat)) return false;    var Tmplen = this.length-tmpfloat.tostring (). length; return tmpfloat + "0". Repeat (tmplen) = = this;}    /** whether the test is an integer **/String.prototype.isInt = function () {if (this = = "NaN") return false; return this = = parseint (this). toString ();}    /** gets n the same string **/string.prototype.repeat = function (num) {var tmparr = [];    for (var i = 0; i < num; i++) Tmparr.push (this); Return Tmparr.join ("");} /** merges multiple blanks for a blank **/String.prototype.resetBlank = function () {return this.Replace (/s+/g, "");} /** Remove left blank **/String.prototype.LTrim = function () {return this.replace (/^s+/g, "");} /** Remove the right blank **/String.prototype.RTrim = function () {return this.replace (/s+$/g, "");} /** remove both sides blank **/String.prototype.trim = function () {return this.replace (/(^s+) | ( s+$)/g, "");} /** reserved number **/String.prototype.getNum = function () {return this.replace (/[^d]/g, "");} /** reserved letters **/String.prototype.getEn = function () {return this.replace (/[^a-za-z]/g, "");} /** reserved Chinese **/String.prototype.getCn = function () {return this.replace (/[^u4e00-u9fa5uf900-ufa2d]/g, "");} /** gets the byte length **/String.prototype.getRealLength = function () {return this.replace (/[^x00-xff]/g, "--"). Length; /** A string of the specified length from the left **/String.prototype.left = function (n) {return This.slice (0, n);} /** A string of the specified length from the right **/String.prototype.right = function (n) {return this.slice (this.length-n);}

JavaScript String Object Extension method