活动按钮状态流转

uni_modules/zebra-swiper/libs/update/updateSlidesProgress.js

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+export default function updateSlidesProgress(translate = this && this.translate || 0) {
+	const swiper = this;
+	const params = swiper.params;
+	const {
+		slides,
+		rtlTranslate: rtl,
+		snapGrid
+	} = swiper;
+	if (slides.length === 0) return;
+	if (typeof slides[0].swiperSlideOffset === 'undefined' || typeof slides[slides.length - 1].swiperSlideOffset ===
+		'undefined') swiper
+		.updateSlidesOffset();
+	let offsetCenter = -translate;
+	if (rtl) offsetCenter = translate; // Visible Slides
+
+	swiper.visibleSlidesIndexes = [];
+	swiper.visibleSlides = [];
+	
+	// slides.forEach((item)=>)
+
+	for (let i = 0; i < slides.length; i += 1) {
+		const slide = slides[i];
+		let slideOffset = slide.swiperSlideOffset;
+		if (params.cssMode && params.centeredSlides) {
+			slideOffset -= slides[0].swiperSlideOffset;
+		}
+
+		const slideProgress = (offsetCenter + (params.centeredSlides ? swiper.minTranslate() : 0) - slideOffset) / (
+			slide.swiperSlideSize + params.spaceBetween);
+		const originalSlideProgress = (offsetCenter - snapGrid[0] + (params.centeredSlides ? swiper.minTranslate() :
+			0) - slideOffset) / (slide.swiperSlideSize + params.spaceBetween);
+		const slideBefore = -(offsetCenter - slideOffset);
+		const slideAfter = slideBefore + swiper.slidesSizesGrid[i];
+		const isVisible = slideBefore >= 0 && slideBefore < swiper.size - 1 || slideAfter > 1 && slideAfter <= swiper
+			.size || slideBefore <= 0 && slideAfter >= swiper.size;
+		if (isVisible) {
+			swiper.visibleSlides.push(slide);
+			swiper.visibleSlidesIndexes.push(i);
+			slides[i].addClass(params.slideVisibleClass);
+		}
+
+		slide.progress = rtl ? -slideProgress : slideProgress;
+		slide.originalProgress = rtl ? -originalSlideProgress : originalSlideProgress;
+	}
+}