我明明已经定义了anim，为什么还是报错未定义？

Question

<template>
  <view class="container">
    <view class="header">
      <view class="logo"></view>
      <view class="notification"></view>
    </view>
    <view class="users">
      <scroll-view scroll-x class="scroll-wrap">
        <image
          v-for="(item, index) in 10"
          :key="index"
          src="../../static/img/strawberry.jpg"
        ></image>
      </scroll-view>
    </view>
    <view class="content">
      <view class="swiper_wrap">
        <view
          class="swiper_item"
          v-for="(user, index) in swiper_data"
          :key="index"
          :data_id="index"
          :animation="user.anim"
          @touchstart="touchStart"
          @touchmove="touchMove"
          @touchend="touchEnd"
        >
          <view class="item_iflike">
            <!-- 不喜欢按钮 -->
            <view class="item_dislike"><img src="" alt="" /></view>
            <!-- 喜欢按钮 -->
            <view class="item_like"><img src="" alt="" /></view>
          </view>
          <!-- 内容 -->
          <view class="item_info"> 内容</view>
        </view>
      </view>
    </view>
    <view class="tabs">
      <tab-box :current-page="1"></tab-box>
    </view>
  </view>
</template>

<script setup lang="ts">
  import tabBox from "../components/tabBox/tabBox.vue";
  let startX = 0; // 滑动开始x轴的位置
  let startY = 0; // 滑动开始y轴的位置
  let moveX = 0; // 滑动X轴的位置
  let moveY = 0; // 滑动Y轴的位置
  let like_state = 0; // 左滑:-1; 没滑动: 0; 右滑动: 1
  let currentIndex = -1; // 当前滑动的卡片index
  let skewDeg = 0; // 当前滑动卡片的倾斜度
  // todo 请求后端获取卡片列表

  let swiper_data: any[] = [
    {
      likestate: 0,
      anim: null
    },
    {
      likestate: 0,
      anim: null
    },
    {
      likestate: 0,
      anim: null
    },
  ];

  // 开始触摸:记录位置
  const touchStart = (event: any) => {
    console.log(event);
    startX = event.touches[0].pageX;
    startY = event.touches[0].pageY;
  };
  // 触摸开始滑动
  const touchMove = (event: any) => {
    let currentX = event.touches[0].pageX;
    let currentY = event.touches[0].pageY;
    let movex = currentX - startX;
    let movey = currentY - startY;
    let text = "";
    let currentindex = event.currentTarget.dataset.id;
    let state = 0; // 左滑:-1; 没滑动: 0; 右滑动: 1
    if (Math.abs(movex) > Math.abs(movey)) {
      // 左右滑动
      if (movex < -10) {
        text = "左滑";
        state = -1;
      } else if (movex > 10) {
        text = "右滑";
        state = 1;
      }
      skew(currentindex, movex, movey);
    } else {
      // 上下方向滑动
      if (movey < 0) text = "上滑";
      else if (movey > 0) text = "下滑";
    }
    // 改变swiper_data属性
    swiper_data[currentIndex]["text"] = text;
    swiper_data[currentIndex]["like_state"] = state;
    like_state = state;
    currentIndex = currentindex;
    moveX = movex;
    moveY = movey;
  };
  // 触摸结束
  const touchEnd = (event: any) => {
    if (Math.abs(moveX) > 60) {
      // 隐藏
      // hidden()
    } else {
      let anim = uni.createAnimation({
        duration: 300,
        timingFunction: "ease-in-out",
      });
      anim.rotate(0).step(1000);
      swiper_data[currentIndex]["anim"] = anim.export();
      swiper_data[currentIndex]["like_state"] = 0;
    }
  };
  //  触摸卡片倾斜
  const skew = (index, moveX, moveY) => {
    let anim = uni.createAnimation({
      duration: 500,
      timingFunction: "linear",
    });
    // swiper_data[index]['anim'] = anim
    if (Math.abs(moveX) < 180) {
      skewDeg = moveX / 4;
      anim.rotate(skewDeg).step(1000);
      swiper_data[index]["anim"] = anim.export();
    }
  };

  // 触摸结束, 卡片消失
  const hidden = () => {
    let anim = uni.createAnimation({
      duration: 400,
      timingFunction: "ease-in-out",
    });
    if (like_state == -1) {
      anim.translate(-400, -400);
    } else if (like_state == 1) {
      anim.translate(400, -400);
    }

    anim.rotate(skewDeg).opacity(0).step(1000);
    swiper_data[currentIndex]["anim"] = anim.export();
  };
</script>

想使用uni-app 自带的动画效果，实现划片的动画效果，但是一滑动就出现anim未定义的错误，可是我明明定义了啊

求大佬指点

Answer 1

有没有一种可能是你这里出现问题了呢？

swiper_data[index]["anim"] = anim.export();
// 或者
swiper_data[currentIndex]["anim"] = anim.export();

具体是在你的组件的第82行，我不知道应该是哪一个。你看见查看看。
程序在 swiper_data 中并没有匹配到对应下标的元素呢？打印一下日志就知道了。