输出的this指向谁()var obj ={ele:document.getElementById("box"),sayName(){this.ele.onclick=()=>{console.log(this);}}};obj.sayName()
A.windowB.objC.box元素D.null
A.undefinedB.nullC.stringD.""
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