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如果在「實例化」JavaScript類「使用括號」或「不使用括號」之間存在什麼區別?「新狗」或「新狗()」
function Animal(name) {
this.name = name;
}
Animal.prototype.sayName = function() {
console.log(this.name);
};
function Dog(name) {
Animal.call(this, name);
}
Dog.prototype = new Animal(null);
Dog.prototype.bark = function() {
console.log("Woof!");
};
var d = new Dog
或
var d = new Dog()