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下列代码输出为?varperson={fname:"John

[单选题]
下列代码输出为?

var person={fname:"John",lname:"Doe",age:25};

var txt="";

for (x in person){

  txt=txt + person[x];

}

alert(txt);


  • JohnDoe25
  • fname:"John",lname:"Doe",age:25
  • fname:John,lname:Doe,age:25
  • fnamelnameage

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