function?animal(){?var?action?=?"eat";}
animal.prototype.action?=?"walk";
var?dog?=?new?animal();
dog.action???//這里得到的walk????????dog.__proto__?指向?animal.prototype?????構造出來的dog只能訪問animal的原型屬性？
關于js的prototype
西蘭花偉大炮
2016-12-04 19:05:07
