The content handler may be invoked either by the user, calling the complete , method on the event instance, or at the point of emission where the emitter invokes the complete method.
内容处理程序可以由用户调用事件实例的complete方法来调用,或者是在发射器调用complete方法时的发射点处调用。
The null must intersect with the emitter at the point where you want to emit particles.
这个空物体必须和发射器有交叉的点以便于从这些部位发射粒子。
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