javascript - 如何从 JS 方法的“eventCallBack”返回值

Question

如何从 JS 方法的“eventCallBack”返回值

见 JS 函数定义：

window.plugins.GCM.register("428641231987", "GCM_Event", this.GCM_Success, this.GCM_Fail);

这里

@param senderId - GCM service identifier

@param eventCallback - {String} - Name of global window function that will handle incoming events from GCM
@param successCallback - {Function} - called on success on registering device

@param failureCallback - {Function} - called on failure on registering device

现在我想返回在“GCM_Event”中生成的值

var requiredValue = window.plugins.GCM.register("428641231987", "GCM_Event", this.GCM_Success, this.GCM_Fail);

我想要 requiredValue 中的值