constname="Lydia";age=21;console.log(deletename);console.log(deleteage);A:false,trueB:"Lydia",21C:true,trueD:undefined,undefined参考回答:

constname="Lydia";age=21;console.log(deletename);console.log(deleteage);A:false,trueB:"Lydia",21C:true,trueD:undefined,undefined参考回答: