如何在 JavaScript 中实现多态性?
javascriptobject oriented programmingprogramming
多态性
多态性是面向对象编程 (OOP) 的原则之一。它有助于以某种方式设计对象，使它们可以与特定提供的对象共享或覆盖任何行为。多态性利用继承来实现这一点。
在下面的示例中，子对象(例如"cricket"和"tennis")已覆盖从父对象"game"调用的"select"方法，并分别返回一个新字符串，如输出所示。而另一个子对象"football"并没有覆盖select 方法，而是共享(继承)了该方法并显示父字符串，如输出所示。
示例
<html>
<body>
<script>
var game = function () {}
game.prototype.select = function()
{
return " i love games and sports"
}
var cricket = function() {}
cricket.prototype = Object.create(game.prototype);
cricket.prototype.select = function() // overridden the select method to display { new string.
return "i love cricket"
}
var tennis = function() {}
tennis.prototype = Object.create(game.prototype); // overridden the select method to display new
tennis.prototype.select = function() string
{
return "i love tennis"
}
var football = function() {}
football.prototype = Object.create(game.prototype); // shared parent property
var games = [new game(), new cricket(), new tennis(), new football()];
games.forEach(function(game){
document.write(game.select());
document.write("</br>");
});
</script>
</body>
</html>
输出
i love games and sports i love cricket i love tennis i love games and sports
