Add event handler apis. #17
Description
cc.onMove(function(x, y, z) {});
cc.onSetTargetChange(function(x, y, z) {});
cc.onRemoveTargetChange(function(x, y, z) {});
cc.getTargetToSet();
cc.getTargetToRemove();
{{ message }}
cc.onMove(function(x, y, z) {});
cc.onSetTargetChange(function(x, y, z) {});
cc.onRemoveTargetChange(function(x, y, z) {});
cc.getTargetToSet();
cc.getTargetToRemove();