js中的string.format函数代码

String.format = function() {
    if (arguments.length == 0)
        return null;
    var str = arguments[0];
    for ( var i = 1; i < arguments.length; i++) {
        var re = new RegExp('\\{' + (i - 1) + '\\}', 'gm');
        str = str.replace(re, arguments[i]);
    }
    return str;
};
// var a = "我喜欢吃{0}，也喜欢吃{1}，但是最喜欢的还是{0},偶尔再买点{2}";
// alert(String.format(a, "苹果","香蕉","香梨"));
// 结果:我喜欢吃苹果，也喜欢吃香蕉，但是最喜欢的还是苹果,偶尔再买点香梨

String.prototype.format = function(args) {
    var result = this;
    if (arguments.length > 0) {    
        if (arguments.length == 1 && typeof (args) == "object") {
            for (var key in args) {
                if(args[key]!=undefined){
                    var reg = new RegExp("({" + key + "})", "g");
                    result = result.replace(reg, args[key]);
                }
            }
        }
        else {
            for (var i = 0; i < arguments.length; i++) {
                if (arguments[i] != undefined) {
                    var reg = new RegExp("({[" + i + "]})", "g");
                    result = result.replace(reg, arguments[i]);
                }
            }
        }
    }
    return result;
}
//两种调用方式
 var template1="我是{0}，今年{1}了";
 var template2="我是{name}，今年{age}了";
 var result1=template1.format("loogn",22);
 var result2=template2.format({name:"loogn",age:22});
 //两个结果都是"我是loogn，今年22了"

function stringFormat() {
         if (arguments.length == 0)
             return null;
         var str = arguments[0];
         for (var i = 1; i < arguments.length; i++) {
             var re = new RegExp('\\{' + (i - 1) + '\\}', 'gm');
             str = str.replace(re, arguments[i]);
         }
         return str;
     } 
 StringFormat("&Type={0}&Ro={1}&lPlan={2}&Plan={3}&={4}&Id={5}&Id={6}", data1, data2, data3,data4, data5,data6,data7);

String.format = function(str) {
var args = arguments, re = new RegExp("%([1-" + args.length + "])", "g");
return String(str).replace(
re,
function($1, $2) {
return args[$2];
}
);
};

String.prototype.format = function(args) {
  if (arguments.length > 0) {
    var result = this;
    if (arguments.length == 1 && typeof(args) == "object") {
      for (var key in args) {
        var reg = new RegExp("({" + key + "})", "g");
        result = result.replace(reg, args[key]);
      }
    } else {
      for (var i = 0; i < arguments.length; i++) {
        if (arguments[i] == undefined) {
          return "";
        } else {
          var reg = new RegExp("({[" + i + "]})", "g");
          result = result.replace(reg, arguments[i]);
        }
      }
    }
    return result;
  } else {
    return this;
  }
}

String.format = function() {
  for (var a = arguments[0], b = 1; b < arguments.length; b++) a = a.replace(RegExp("\\{" + (b - 1) + "\\}", "ig"), arguments[b]);
  return a
};