Synonyms
virtual
概述
¥Overview
@abstract 标记标识必须由继承该成员的对象实现（或覆盖）的成员。
¥The @abstract tag identifies members that must be implemented (or overridden) by objects that inherit the member.
示例
¥Example
/**
* Generic dairy product.
* @constructor
*/
function DairyProduct() {}
/**
* Check whether the dairy product is solid at room temperature.
* @abstract
* @return {boolean}
*/
DairyProduct.prototype.isSolid = function() {
throw new Error('must be implemented by subclass!');
};
/**
* Cool, refreshing milk.
* @constructor
* @augments DairyProduct
*/
function Milk() {}
/**
* Check whether milk is solid at room temperature.
* @return {boolean} Always returns false.
*/
Milk.prototype.isSolid = function() {
return false;
};