String.format = function () {
  var s = arguments[0];
  for (var arg in arguments) {
    var i = parseInt(arg);
    s = s.replace("{" + i + "}", arguments[i + 1]);
  }
  return s;
};

console.log(String.format("{0} is {1} nice!", "donettips.info"));

donettips.info is undefined nice!

String.format = function () {
  var s = arguments[0],
      args = arguments;
  return s.replace(/{(\d+)}/g, function (match, number) {
    var i = parseInt(number);
    return typeof args[i + 1] != 'undefined' ? args[i + 1] : match;
  });
};

console.log(String.format("{0}:0 {1}:1 {2}:2, {{0}} {{{1}}}  {{{{2}}}}   {2}", "zero", "{2}", "two"));

zero:0 {2}:1 two:2, {zero} {{{2}}}  {{{two}}}   two

String.format = function () {
  var s = arguments[0],
      args = arguments;
  return s.replace(/\{\{|\}\}|\{(\d+)\}/g, function (match, number) {
    if (match == "{{") { return "{"; }
    if (match == "}}") { return "}"; }
    var i = parseInt(number);
    return typeof args[i + 1] != 'undefined'
                              ? args[i + 1]
                              : match;
  });
};

zero:0 {2}:1 two:2, {0} {{2}}  {{2}}   two

String.prototype.format = function () {
   ...
}

String.format = function () {
  var s = arguments[0],
      args = arguments[1];
  for (var arg in args) {
    s = s.replace(new RegExp("{" + arg + "}", "g"), args[arg]);
  }
  return s;
};

String.prototype.format = function () {
  var s = this.toString(),
      args = arguments[0];
  for (var arg in args) {
    s = s.replace(new RegExp("{" + arg + "}", "g"), args[arg]);
  }
  return s;
};

console.log(String.format("{site} is {adj}! {site} is {adj}!", { site: "donettips.info", adj: "nice" }));
console.log("{site} is {adj}! {site} is {adj}!".format({ site: "donettips.info", adj: "nice" }));

String.format = function String$format(format, args) {
  /// <summary locid="M:J#String.format" />
  /// <param name="format" type="String"></param>
  /// <param name="args" parameterArray="true" mayBeNull="true"></param>
  /// <returns type="String"></returns>
//  var e = Function._validateParams(arguments, [
//    { name: "format", type: String },
//    { name: "args", mayBeNull: true, parameterArray: true }
//  ]);
//  if (e) throw e;
  return String._toFormattedString(false, arguments);
};
String._toFormattedString = function String$_toFormattedString(useLocale, args) {
  var result = '';
  var format = args[0];
  for (var i = 0; ; ) {
    var open = format.indexOf('{', i);
    var close = format.indexOf('}', i);
    if ((open < 0) && (close < 0)) {
      result += format.slice(i);
      break;
    }
    if ((close > 0) && ((close < open) || (open < 0))) {
      if (format.charAt(close + 1) !== '}') {
        throw Error.argument('format', Sys.Res.stringFormatBraceMismatch);
      }
      result += format.slice(i, close + 1);
      i = close + 2;
      continue;
    }
    result += format.slice(i, open);
    i = open + 1;
    if (format.charAt(i) === '{') {
      result += '{';
      i++;
      continue;
    }
    if (close < 0) throw Error.argument('format', Sys.Res.stringFormatBraceMismatch);
    var brace = format.substring(i, close);
    var colonIndex = brace.indexOf(':');
    var argNumber = parseInt((colonIndex < 0) ? brace : brace.substring(0, colonIndex), 10) + 1;
    if (isNaN(argNumber)) throw Error.argument('format', Sys.Res.stringFormatInvalid);
    var argFormat = (colonIndex < 0) ? '' : brace.substring(colonIndex + 1);
    var arg = args[argNumber];
    if (typeof (arg) === "undefined" || arg === null) {
      arg = '';
    }
    if (arg.toFormattedString) {
      result += arg.toFormattedString(argFormat);
    }
    else if (useLocale && arg.localeFormat) {
      result += arg.localeFormat(argFormat);
    }
    else if (arg.format) {
      result += arg.format(argFormat);
    }
    else
      result += arg.toString();
    i = close + 1;
  }
  return result;
}

console.log(String.format("{0:n}, {0:c}, {0:p}, {0:d}", 100.0001));
// result:   100.00, ¤100.00, 10,000.01 %, 100.0001

console.log(String.format("{0:d}, {0:t}", new Date(2015, 1, 1, 10, 45)));
// result:   02/01/2015, 10:45

String.format([full format string], [arguments...]);
// or:
[date|number].format([partial format string]);

// Object path
String.format("Welcome back, {username}!", 
{ id: 3, username: "JohnDoe" });
// Result: "Welcome back, JohnDoe!"

// Date/time formatting
String.format("The time is now {0:t}.", 
new Date(2009, 5, 1, 13, 22));
// Result: "The time is now 01:22 PM."

// Date/time formatting (without using a full format string)
var d = new Date();
d.format("hh:mm:ss tt");
// Result: "02:28:06 PM"

// Custom number format string
String.format("Please call me at {0:+##0 (0) 000-00 00}.", 4601111111);
// Result: "Please call me at +46 (0) 111-11 11."

// Another custom number format string
String.format("The last year result was {0:+$#,0.00;-$#,0.00;0}.", -5543.346);
// Result: "The last year result was -$5,543.35."

// Alignment
String.format("|{0,10:PI=0.00}|", Math.PI);
// Result: "|   PI=3.14|"

// Rounding
String.format("1/3 ~ {0:0.00}", 1/3);
// Result: "1/3 ~ 0.33"

// Boolean values
String.format("{0:true;;false}", 0);
// Result: "false"

// Explicitly specified localization
// (note that you have to include the .js file for used cultures)
msf.setCulture("en-US");
String.format("{0:#,0.0}", 3641.667);
// Result: "3,641.7"

msf.setCulture("sv-SE");
String.format("{0:#,0.0}", 3641.667);
// Result: "3 641,7"

//inline arguments
String.format("some string with {0} and {1} injected using argument {{number}}", 'first value', 'second value');
//returns: 'some string with first value and second value injected argument {number}'

//single array
String.format("some string with {0} and {1} injected using array {{number}}", [ 'first value', 'second value' ]);
//returns: 'some string with first value and second value injected using array {number}'

//single object
String.format("some string with {first} and {second} value injected using {{propertyName}}",{first:'first value',second:'second value'});
//returns: 'some string with first value and second value injected using {propertyName}'

 [DisplayName("تاریخ درج")]
 public DateTime CreateDate { get; set; }
 [DisplayName("تاریخ انتشار")]
 public DateTime PublishDate { get; set; }

[DisplayName("نوع مطلب")]
public string BlogType { get; set; }

 <script type="text/javascript">

            $(function () {
                var blogDataSource = new kendo.data.DataSource({
                    transport: {
                        read: {
                            url: "@Url.Action("GetLastBlogs", "Admin")",
                            dataType: "json",
                            contentType: 'application/json; charset=utf-8',
                            type: 'GET'
                        },
                        parameterMap: function (options) {
                            return kendo.stringify(options);
                        }
                    },
                    schema: {
                        data: "data",
                        total: "total",
                        model: {
                            fields: {
                                "id": { type: "number" }, //تعیین نوع فیلد برای جستجوی پویا مهم است
                                "title": { type: "string" },
                                "content": { type: "string" },
                                "imagepath": { type: "string" },
                                "attachmentid": { type: "number" },
                                "createdate": { type: "string" },
                                "publishdate": { type: "date" },
                                "blogtype": { type: "string" },
                                "lastmodified": { type: "date" },
                                "visitcount": { type: "number" },
                                "isarchived": { type: "boolean" },
                                "ispublished": { type: "boolean" },
                                "isdeleted": { type: "boolean" },
                                "tags": { type: "string" }


                            }
                        }
                    },
                    error: function (e) {
                        alert(e.errorThrown);
                    },
                    pageSize: 10,
                    sort: { field: "id", dir: "desc" },
                    serverPaging: true,
                    serverFiltering: true,
                    serverSorting: true
                });

                $("#report-grid").kendoGrid({
                    dataSource: blogDataSource,
                    autoBind: true,
                    scrollable: false,
                    pageable: true,
                    sortable: true,
                    filterable: true,
                    reorderable: true,
                    columnMenu: true,
                    columns: [
                        { field: "id", title: "شماره", width: "130px" },
                        { field: "title", title: "عنوان مطلب" },
                        { field: "createdate", title: "تاریخ درج" },
                        { field: "publishdate", title: "تاریخ انتشار" },
                        { field: "content", title: "خلاصه مطلب" },
                        { field: "blogtype", title: "نوع" },
                        { field: "lastmodified", title: "آخرین ویرایش" },
                        { field: "visitcount", title: "تعداد بازدید" },
                        {
                            field: "isarchived", title: "آرشیو شده",
                            template: '<input type="checkbox" #= isarchived ? checked="checked" : "" # disabled="disabled" ></input>'
                        },
                        {
                            field: "ispublished", title: "منتشر شده",
                            template: '<input type="checkbox" #= ispublished ? checked="checked" : "" # disabled="disabled" ></input>'
                        }

                    ]
                });
            });
            </script>