如果 AnimatorStateTransition.hasExitTime 为 true，则 **exitTime** 表示过渡可以生效的准确时间。\ 这是以标准化时间表示的，因此，举例来说，退出时间 0.75 意味着在第一帧上如果已播放了 75% 的动画，Exit Time 条件就会为 true。在下一帧上，该条件为 false。\ 对于循环动画，退出时间小于 1 的过渡在每个循环都会评估，因此可使用此选项在每个循环的动画中以适当时机对过渡进行计时。\ 退出时间大于 1 的过渡只会评估一次，因此可以用来在特定时间退出（完成固定循环次数后）。例如，退出时间为 3.5 的过渡只会在三个半循环后评估一次。
**已知限制：** 至少需要评估一次状态，然后才能触发 exitTime 条件，这意味着 exitTime 0 将永远不会在第一帧触发。
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