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                >[danger]組合繼承 ----- 解決子類對象, 共享父類的, 引用類型數據 ~~~ function Person(){ this.name = "person"; this.grade = { math: 0 } } function Student() { Person.apply(this); // 當下面new Student() 這里都會調用父類 } Student.prototype = new Person(); // 第一次調用父類 let stu1 = new Student(); stu1.name = "100"; stu1.grade.math = 100; let stu2 = new Student(); console.log(stu2.name); // person console.log(stu2.grade.math); // 0 (不在共享引用數據了) console.log(stu2.grade === stu1.grade); // false ~~~ >新的問題是, 多次觸發了父類構造函數, 如何解決呢? ---- 看最終版, [寄生組合繼承](%E5%AF%84%E7%94%9F%E7%BB%84%E5%90%88%E7%BB%A7%E6%89%BF.md)
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