Question

我的代码如下：

function Example(){}
Example.myMethod = function(){};
function SpecificExample(){}
SpecificExample.prototype = Object.create(Example.prototype);
SpecificExample.prototype.constructor = SpecificExample;

我希望SpecificExample延伸Example。为什么这段代码不起作用？

Answer 1

Example.myMethod是附加到构造函数/对象的函数，但它不是其原型的一部分。这可以称为静态函数（在ES6中就是这样）。要使它们成为原型的一部分，请将它们添加到原型中：

function Example(){}
Example.prototype.myMethod = function(){};
function SpecificExample(){}
SpecificExample.prototype = Object.create(Example.prototype);
// As @JaredSmith said, you shouldn't change the constructor, and why would you?
// function SpecificExample(){} IS your constructor. So...
// SpecificExample.prototype.constructor = SpecificExample;
// should simply be removed.

Javascript - 错误扩展对象

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