类似C#中的Format（JavaScript）

var str ;
String.prototype.format = function()
{
    var args = arguments;               
    return this.replace(/\{(\d+)\}/g,function(x,ii)
                                     {
                                         return args[ii];
                                     }
                         );
};

var a = "I Love {0}, and You Love {1},Where are {0}!";
alert(a.format("You","Me"));

// 类似 C# 中的 string.Format，传的参数是数组，参数组长度可小于 {0} 的匹配值
String.prototype.Format = function(array)
{
 var result = this;
 var pattern = /\{\d+\}/g;
 if (pattern.test(this))
 {
  var arrayR = this.match(pattern);   
  for (var i = 0; i < array.length; i++)
  {
   var re = new RegExp("\\{"+ arrayR[i].match(/\d+/)[0] +"\\}", "ig");
   result = result.replace(re, array[i]);
  }
 }
 
 return result;
};