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javascript 继承 constructor 需要注意点
<!DOCTYPE html><html><head> <title></title></head><body></body><script> var People = function(){ this.name = "Jackey"; }; People.prototype.getName = function(){ return this.name; }; var Man = function(){ this.sex = "male"; People.call(this); }; //缺点 ，name 是父类中的属性，如果修改会影响子类 //Man.prototype = People.prototype; //new 新开内存 Man.prototype = new People(); Man.prototype.constructor = Man;//可随意修改People的属性，不会影响到Man var man = new Man(); console.log(man.getName());</script></html>
<!DOCTYPE html><html><head> <title></title></head><body></body><script> var People = function(){ this.name = "Jackey"; }; People.prototype.getName = function(){ return this.name; }; var Man = function(){ this.sex = "male"; People.call(this); }; //缺点 ，name 是父类中的属性，如果修改会影响子类 //Man.prototype = People.prototype; //new 新开内存 Man.prototype = new People(); Man.prototype.constructor = Man;//可随意修改People的属性，不会影响到Man var man = new Man(); console.log(man.getName());</script></html>
<!DOCTYPE html><html><head> <title></title></head><body></body><script> var People = function(){ this.name = "Jackey"; }; People.prototype.getName = function(){ return this.name; }; var Man = function(){ this.sex = "male"; People.call(this); }; //缺点 ，name 是父类中的属性，如果修改会影响子类 //Man.prototype = People.prototype; //new 新开内存 Man.prototype = new People(); Man.prototype.constructor = Man;//可随意修改People的属性，不会影响到Man var man = new Man(); console.log(man.getName());</script></html>
javascript 继承 constructor 需要注意点
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