vue轮播

vue使用transition实现无缝轮播

直接上代码:

<template>
  <div class="page">
    <div class="carousel">
      <div class="inner">
        <div v-for="(item, index) in imgUrls" :key="index">
          <transition>
            <div class="carousel-item" v-if="index === currentIndex">
              <img :src="item" alt="" />
            </div>
          </transition>
        </div>
      </div>
    </div>
  </div>
</template>

<script>
export default {
  name: "",
  components: {},
  data() {
    return {
      currentIndex: 0,
      imgUrls: [
        "https://img.hbhcdn.com/zhuanti/jh-img-orig-ga_1329336533799247872_600_300_25174.jpg",
        "https://img.hbhcdn.com/zhuanti/jh-img-orig-ga_1329337053091831808_600_300_36103.jpg",
        "https://img.hbhcdn.com/zhuanti/jh-img-orig-ga_1329337017066954752_600_300_37129.jpg",
      ],
    };
  },
  methods: {
    autoPlay() {
      setInterval(() => {
        this.setIndex();
      }, 3000);
    },
    setIndex() {
      this.currentIndex++;
      if (this.currentIndex == this.imgUrls.length) {
        this.currentIndex = 0;
      }
    },
  },
  mounted() {
    this.autoPlay();
  },
};
</script>

<style>
.carousel {
  width: 600px;
  height: 300px;
  position: relative;
  margin: 0 auto;
}
.inner {
  position: relative;
  width: 100%;
  height: 100%;
  overflow: hidden;  /*必须*/
}
.carousel-item {
  position: absolute; /*必须*/
  top: 0;
  left: 30px;
  width: 100%;
  height: 100%;
  margin: 0 10px;
}
.v-enter-active,
.v-leave-active {  /*进入和离开需要执行时间*/
  transition: all 0.5s linear;
}
.v-enter-active {
  transform: translateX(100%);
}
.v-enter-to {
  transform: translateX(0);
}
.v-leave-active {
  transform: translateX(0);
}
.v-leave-to {
  transform: translateX(-100%);
}
</style>

后续扩展放向:

　　1. 封装组件

　　2.可拖拽

　　3.轮播样式可定制化

　　4.基础拓展-->跑马灯功能

 

 

vue封装轮播图--组件化

层级结构

 

 

 SwiperItem.vue

<template>
  <div class="slide">
    <slot></slot>
  </div>
</template>

<script>
export default {
  name: "Slide",
};
</script>

<style scoped>
.slide {
  width: 100%;
  flex-shrink: 0;
}

.slide img {
  width: 100%;
}
</style>

 

Swiper.vue

<template>
  <div id="hy-swiper">
    <div
      class="swiper"
      @touchstart="touchStart"
      @touchmove="touchMove"
      @touchend="touchEnd"
    >
      <slot></slot>
    </div>
    <slot name="indicator"> </slot>
    <div class="indicator">
      <slot name="indicator" v-if="showIndicator && slideCount > 1">
        <div
          v-for="(item, index) in slideCount"
          class="indi-item"
          :class="{ active: index === currentIndex - 1 }"
          :key="index"
        ></div>
      </slot>
    </div>
  </div>
</template>

<script>
export default {
  name: "Swiper",
  props: {
    interval: {
      //多久滚动一张
      type: Number,
      default: 3000,
    },
    animDuration: {
      //延迟多久开始轮播
      type: Number,
      default: 300,
    },
    moveRatio: {
      //手指拖拽轮播图宽度25%才会切下一张
      type: Number,
      default: 0.25,
    },
    showIndicator: {
      //指示器
      type: Boolean,
      default: true,
    },
  },
  data: function() {
    return {
      slideCount: 0, // 元素个数
      totalWidth: 0, // swiper的宽度
      swiperStyle: {}, // swiper样式
      currentIndex: 1, // 当前的index
      scrolling: false, // 是否正在滚动
    };
  },
  mounted: function() {
    // 1.操作DOM, 在前后添加Slide
    setTimeout(() => {
      this.handleDom();

      // 2.开启定时器
      this.startTimer();
    }, 200);
  },
  methods: {
    /**
     * 定时器操作
     */
    startTimer: function() {
      this.playTimer = window.setInterval(() => {
        this.currentIndex++;
        this.scrollContent(-this.currentIndex * this.totalWidth);
      }, this.interval);
    },
    stopTimer: function() {
      window.clearInterval(this.playTimer);
    },

    /**
     * 滚动到正确的位置
     */
    scrollContent: function(currentPosition) {
      // 0.设置正在滚动
      this.scrolling = true;

      // 1.开始滚动动画
      this.swiperStyle.transition = "transform " + this.animDuration + "ms";
      this.setTransform(currentPosition);

      // 2.判断滚动到的位置
      this.checkPosition();

      // 4.滚动完成
      this.scrolling = false;
    },

    /**
     * 校验正确的位置
     */
    checkPosition: function() {
      window.setTimeout(() => {
        // 1.校验正确的位置
        this.swiperStyle.transition = "0ms";
        if (this.currentIndex >= this.slideCount + 1) {
          this.currentIndex = 1;
          this.setTransform(-this.currentIndex * this.totalWidth);
        } else if (this.currentIndex <= 0) {
          this.currentIndex = this.slideCount;
          this.setTransform(-this.currentIndex * this.totalWidth);
        }

        // 2.结束移动后的回调
        this.$emit("transitionEnd", this.currentIndex - 1);
      }, this.animDuration);
    },

    /**
     * 设置滚动的位置
     */
    setTransform: function(position) {
      this.swiperStyle.transform = `translate3d(${position}px, 0, 0)`;
      this.swiperStyle[
        "-webkit-transform"
      ] = `translate3d(${position}px), 0, 0`;
      this.swiperStyle["-ms-transform"] = `translate3d(${position}px), 0, 0`;
    },

    /**
     * 操作DOM, 在DOM前后添加Slide
     */
    handleDom: function() {
      // 1.获取要操作的元素
      let swiperEl = document.querySelector(".swiper");
      let slidesEls = swiperEl.getElementsByClassName("slide");

      // 2.保存个数
      this.slideCount = slidesEls.length;

      // 3.如果大于1个, 那么在前后分别添加一个slide
      if (this.slideCount > 1) {
        let cloneFirst = slidesEls[0].cloneNode(true);
        let cloneLast = slidesEls[this.slideCount - 1].cloneNode(true);
        swiperEl.insertBefore(cloneLast, slidesEls[0]);
        swiperEl.appendChild(cloneFirst);
        this.totalWidth = swiperEl.offsetWidth;
        this.swiperStyle = swiperEl.style;
      }

      // 4.让swiper元素, 显示第一个(目前是显示前面添加的最后一个元素)
      this.setTransform(-this.totalWidth);
    },

    /**
     * 拖动事件的处理
     */
    touchStart: function(e) {
      // 1.如果正在滚动, 不可以拖动
      if (this.scrolling) return;

      // 2.停止定时器
      this.stopTimer();

      // 3.保存开始滚动的位置
      this.startX = e.touches[0].pageX;
    },

    touchMove: function(e) {
      // 1.计算出用户拖动的距离
      this.currentX = e.touches[0].pageX;
      this.distance = this.currentX - this.startX;
      let currentPosition = -this.currentIndex * this.totalWidth;
      let moveDistance = this.distance + currentPosition;

      // 2.设置当前的位置
      this.setTransform(moveDistance);
    },

    touchEnd: function(e) {
      // 1.获取移动的距离
      let currentMove = Math.abs(this.distance);

      // 2.判断最终的距离
      if (this.distance === 0) {
        return;
      } else if (
        this.distance > 0 &&
        currentMove > this.totalWidth * this.moveRatio
      ) {
        // 右边移动超过0.5
        this.currentIndex--;
      } else if (
        this.distance < 0 &&
        currentMove > this.totalWidth * this.moveRatio
      ) {
        // 向左移动超过0.5
        this.currentIndex++;
      }

      // 3.移动到正确的位置
      this.scrollContent(-this.currentIndex * this.totalWidth);

      // 4.移动完成后重新开启定时器
      this.startTimer();
    },

    /**
     * 控制上一个, 下一个
     */
    previous: function() {
      this.changeItem(-1);
    },

    next: function() {
      this.changeItem(1);
    },

    changeItem: function(num) {
      // 1.移除定时器
      this.stopTimer();

      // 2.修改index和位置
      this.currentIndex += num;
      this.scrollContent(-this.currentIndex * this.totalWidth);

      // 3.添加定时器
      this.startTimer();
    },
  },
};
</script>

<style scoped>
#hy-swiper {
  overflow: hidden;
  position: relative;
}

.swiper {
  display: flex;
}

.indicator {
  display: flex;
  justify-content: center;
  position: absolute;
  width: 100%;
  bottom: 8px;
}

.indi-item {
  box-sizing: border-box;
  width: 8px;
  height: 8px;
  border-radius: 4px;
  background-color: #fff;
  line-height: 8px;
  text-align: center;
  font-size: 12px;
  margin: 0 5px;
}

.indi-item.active {
  background-color: rgba(212, 62, 46, 1);
}
</style>

index.js

import Swiper from './Swiper'
import SwiperItem from './SwiperItem'

export {
  Swiper,
  SwiperItem
}

 

引入使用该组件

<template>
  <div>
    <swiper>
      <swiper-item v-for="item in banners" :key="item.goods_id">
        <a :href="item.image_src">
          <img :src="item.image_src" alt="" />
        </a>
      </swiper-item>
    </swiper>
  </div>
</template>

<script>
import { SwiperItem, Swiper } from "components/common/swiper"; //轮播图
export default {
  name: "HomeSwiper",
  props: {
    banners: {
      type: Array,
      default() {
        return [];
      },
    },
  },
  components: { SwiperItem, Swiper },
  data() {
    return {};
  },
};
</script>

<style scoped></style>

 

 

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