var Run = function(){}____________.print = function(){ alert("666");}var obj = new Run();obj.print()横线处补充什么代码, 打印结果是‘666’()
A.Run.prototypeB.RunC.Run.prototype.toStringD.以上都不对
A.[]B.0C.FALSED.""
A.__proto__B.applyC.instanceofD.constructor