GlobalEventHandlers.onplaying

The onplaying property of the GlobalEventHandlers mixin is the event handler for processing playing (en-US) events.

playing 事件将会在媒体做好播放准备后（因暂停或网络延迟而导致媒体数据缺失）触发。

element.onplaying = handlerFunction;
var handlerFunction = element.onplaying;

handlerFunction 为 null 或一个函数 指定事件处理程序

• playing
• DOM event handlers