(The link starting with // is protocol relative URL.) <script src="//cdn.jsdelivr.net/velocity/1.2.3/velocity.min.js"></script> Velocity has two usage styles: The $.Velocity function, which is a factory method extended from the jQuery root object.
（以//开头的链接是协议相对URL） <script src="//cdn.jsdelivr.net/velocity/1.2.3/velocity.min.js"></script> Velocity有两种使用方式： $.Velocity函数，这是一个从jQuery根对象扩展的工厂方法。