//创建闪烁动画
createBlinkAnimation(totalDuration) {
    let that = this;
    clearInterval(that.timer);
    // 创建动画实例
    let animation = uni.createAnimation({
        duration: totalDuration,
        timingFunction: 'step-start',
    });
    that.timer = setInterval(() => {
        animation.opacity(0).step({
            duration: 200
        });
        animation.opacity(1).step();
        that.animationData = animation.export();
    }, totalDuration);
}

运行到浏览器里是可以循环执行的，运行到开发工具中，定时器会执行，动画只有一次动作