Method step

src/common/overlay/levelRenderer/Clip.js:61–98

(time)

    }

    step(time) {
        var easing = new AEasing();
        var percent = (time - this._startTime) / this._life;

        // 还没开始
        if (percent < 0) {
            return;
        }

        percent = Math.min(percent, 1);

        var easingFunc = typeof this.easing == 'string'
            ? easing[this.easing]
            : this.easing;
        var schedule = typeof easingFunc === 'function'
            ? easingFunc(percent)
            : percent;

        this.fire('frame', schedule);

        // 结束
        if (percent == 1) {
            if (this.loop) {
                this.restart();
                // 重新开始周期
                // 抛出而不是直接调用事件直到 stage.update 后再统一调用这些事件
                return 'restart';

            }

            // 动画完成将这个控制器标识为待删除
            // 在Animation.update中进行批量删除
            this._needsRemove = true;
            return 'destroy';
        }

        return null;
    }

    restart() {
        var time = new Date().getTime();