[Bug] when calling targetOff any queued events still run

[Bug] when calling targetOff any queued events still run
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#1

Hi

when calling node.targetOff() if there are any events still in the queue it errors out

Uncaught TypeError: Cannot read property 'call' of undefined

The example would be the following where there are objects within the phone object receiving TOUCH_END events

 this.phone.on(cc.Node.EventType.TOUCH_END, () => {
      this.phone.targetOff(this.phone);

is there any better way around this?