Lam, W. K., Maxwell, J. P., & Masters, R. (2009). Analogy learning and the performance of motor skills under pressure. Journal of sport & exercise psychology, 31(3), 337–357. https://doi.org/10.1123/jsep.31.3.337
Represents an event notifying the user that a command has been issued. It is the event object for the command event. The event fires on element referenced by commandForElement.
，这一点在PG官网中也有详细论述
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Figure 2: Example System