Setter 和 Getter 问题
Setter and Getter problems
为什么 age() 的 setter 中的 if 语句没有执行?应该return "年龄必须是数字";
get 语句有效,但 set 语句无效。
class Player {
constructor(name, age, position) {
this._name = name;
this._age = age;
this._position = position;
}
set age(value){
if(value.isNaN()) {
return "Age must be a number";
} else {
return this._age;
}
}
get name() {
return this._name;
}
get age() {
if(typeof this._age === "number") {
return this._age;
}else{
return "Cant fetch players age"
}
}
get position() {
return this._position;
}
};
const test = new Player("Peter", "38", "Forward")
console.log(test.age)
你的构造函数应该调用 setter 而不是实例变量:
class Player {
constructor(name, age, position) {
this._name = name;
this.age = age; //call setter
this._position = position;
}
...
为什么 age() 的 setter 中的 if 语句没有执行?应该return "年龄必须是数字";
get 语句有效,但 set 语句无效。
class Player {
constructor(name, age, position) {
this._name = name;
this._age = age;
this._position = position;
}
set age(value){
if(value.isNaN()) {
return "Age must be a number";
} else {
return this._age;
}
}
get name() {
return this._name;
}
get age() {
if(typeof this._age === "number") {
return this._age;
}else{
return "Cant fetch players age"
}
}
get position() {
return this._position;
}
};
const test = new Player("Peter", "38", "Forward")
console.log(test.age)
你的构造函数应该调用 setter 而不是实例变量:
class Player {
constructor(name, age, position) {
this._name = name;
this.age = age; //call setter
this._position = position;
}
...