使用closure来保护对象内部的属性不被外部修改
function Bird() {
let weight = 15;
this.getWeight = function() {
return weight;
};
}
let duck = new Bird();
duck.getWeight();温馨提示
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function Bird() {
let weight = 15;
this.getWeight = function() {
return weight;
};
}
let duck = new Bird();
duck.getWeight();