JavaScript expands string Method summary

Expanded a few commonly used methods, the need for friends can refer to the following copy code code as follows:

String.prototype.EndWith = function (str) {


if (str = NULL | | str = = "" | | This.length = 0 | | Str.length > This.length)


return false;


if (this.substring (this.length-str.length) = = str)


return true;


Else


return false;


return true;


}


String.prototype.StartWith = function (str) {


if (str = NULL | | str = = "" | | This.length = 0 | | Str.length > This.length)


return false;


if (this.substr (0, str.length) = = str)


return true;


Else


return false;


return true;


}


String.prototype.Trim = function () {


return This.replace (^s*) | ( s*$)/g, "");


}


String.prototype.ltrim = function () {


return This.replace (/(^s*)/g, "");


}


String.prototype.rtrim = function () {


return This.replace (/(s*$)/g, "");


}


String.Format = function (str) {


var i = 1, args = arguments;


var str = args[0];


var re =/{(d+)}/g;


return str.replace (Re, function () {return args[i++]});


};


var json2string = function (obj) {


var t = typeof (obj);


if (t!= "Object" | | obj = = NULL) {


//Simple data type


if (t = = "string") obj = "" + obj + "'";


return String (obj);


            }


else {


Recurse Array or Object


var n, V, json = [], arr = (obj && obj.constructor = Array);


for (n in obj) {


v = obj[n]; t = typeof (V);


if (t = = "string") v = "" + V + "'";


else if (t = = "Object" && v!== null)


v = json2string (v);


Json.push (arr? "": "'" + N + "':") + String (v));


                }


return (arr? ' [': ' {'] + String (JSON) + (arr? "]": "}");


            }


        };