Function.prototype.newInstance (See related posts)

   1  
   2  Function.prototype.New = 
   3  Function.prototype.newInstance = function(){
   4  	for(var i=0,arg=[];i<arguments.length;i++) arg.push("arguments["+i+"]");
   5  	eval("var ins = new this("+arg.join(",")+")");
   6  	return ins;
   7  }
   8  
   9  // example
  10  
  11  // way to get [1,2,3]
  12  new Array(1,2,3)
  13  Array.New(1,2,3)
  14  Array.newInstance(1,2,3)
  15  
  16  // getClass and newInstance
  17  var foo = [];
  18  foo.constructor.New("12345") // [12345]
  19  
  20  var foo = "";
  21  foo.constructor.New("12345") // "12345"