如何修復對象“未定義”

Question

請告訴我如何解決，答案帶有“對象未定義”。

var dog = {
name : "Fido",
weight : 20.2,
age : 4,
breed : "mixed",
activity : "fetch balls"
};
var bark;
if (dog.weight > 20) {
bark = "WOOF WOOF";
} else {
bark = "woof woof";
}

var speak = dog.name + " says " + dog.bark + " when he wants to " +     dog.activity;
console.log(speak);

Answer 1

相反設置的bark = "..." ，如果你想將其設置為的屬性dog對象，將其設置為：

dog.bark = "WOOF WOOF";

 var dog = { name: "Fido", weight: 20.2, age: 4, breed: "mixed", activity: "fetch balls" }; if (dog.weight > 20) { dog.bark = "WOOF WOOF"; } else { dog.bark = "woof woof"; } var speak = dog.name + " says " + dog.bark + " when he wants to " + dog.activity; console.log(speak);