Vue2 实现图片预览功能

2023-12-13 05:38:03

在这里插入图片描述

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
    <link
      rel="stylesheet"
      href="https://unpkg.com/element-ui/lib/theme-chalk/index.css"
    />
    <script src="https://cdn.bootcdn.net/ajax/libs/vue/2.6.13/vue.js"></script>
    <script src="https://cdn.jsdelivr.net/npm/@unocss/runtime"></script>
    <script src="https://unpkg.com/element-ui/lib/index.js"></script>
    <style>
      * {
        margin: 0;
        padding: 0;
        box-sizing: border-box;
      }

      .overlay {
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        background-color: rgba(0, 0, 0, 0.5);
      }

      .preview-container {
        position: fixed;
        top: 50%;
        left: 50%;
        transform: translate(-50%, -50%);
      }

      .preview-container img {
        max-height: 80vh;
      }
    </style>
  </head>
  <body>
    <div id="app" class="h-100vh flex justify-center items-center">
      <div class="image-preview" v-if="showPreview">
        <div class="overlay"></div>

        <i
          class="el-icon-download cursor-pointer fixed text-40px top-40px right-90px"
          @click="changeImage('download')"
        ></i>

        <i
          class="el-icon-circle-close cursor-pointer fixed text-40px top-40px right-40px"
          @click="changeImage('change')"
        ></i>

        <div
          class="w-40px h-40px bg-#67686c cursor-pointer rounded-full flex justify-center items-center fixed left-40px"
          @click="changeImage('prev')"
        >
          <i class="el-icon-arrow-left text-#fff text-30px"></i>
        </div>

        <div
          class="w-40px h-40px bg-#67686c cursor-pointer rounded-full flex justify-center items-center fixed right-40px"
          @click="changeImage('next')"
        >
          <i class="el-icon-arrow-right text-#fff text-30px"></i>
        </div>

        <div class="preview-container">
          <img
            :src="imageUrl"
            :style="{ transform: `scale(${scale})` }"
            alt="Preview Image"
            @wheel.prevent="handleWheel"
          />
        </div>
      </div>

      <div class="thumbnail-container">
        <img
          v-for="(image, index) in images"
          :key="index"
          :src="image"
          class="h-200px w-200px"
          @click="showImage(index)"
        />
      </div>
    </div>
    <script>
      new Vue({
        el: '#app',
        data() {
          return {
            scale: 1, // 初始缩放比例为1
            showPreview: false,
            currentIndex: 0,
            images: [
              'https://image.qwq.link/images/2023/11/24/twitter_zuukyuudo9_20231123-001852_1727481805832642619_photo.md.jpg',
              'https://image.qwq.link/images/2023/11/24/109626211_p0.md.jpg',
              'https://image.qwq.link/images/2023/11/24/113276508_p0.md.jpg',
            ],
          };
        },
        computed: {
          imageUrl() {
            return this.images[this.currentIndex];
          },
        },
        methods: {
          showImage(index) {
            this.scale = 1;
            this.currentIndex = index;
            this.showPreview = true;
          },
          handleWheel(event) {
            // 滚轮向上滚动，放大图片
            if (event.deltaY < 0) {
              this.scale *= 1.1; // 可以根据需要调整缩放系数
            }
            // 滚轮向下滚动，缩小图片
            else {
              this.scale /= 1.1; // 可以根据需要调整缩放系数
            }

            // 限制最小和最大缩放比例，以防图片过大或过小
            if (this.scale < 0.1) {
              this.scale = 0.1;
            }
            if (this.scale > 3) {
              this.scale = 3;
            }
          },
          changeImage(type) {
            const Fn = {
              prev: () => {
                if (this.currentIndex > 0) {
                  this.currentIndex--;
                } else {
                  this.currentIndex = this.images.length - 1;
                }
              },
              next: () => {
                if (this.currentIndex < this.images.length - 1) {
                  this.currentIndex++;
                } else {
                  this.currentIndex = 0;
                }
              },
              download: () => {
                // 注意这个只能下载本地图片不能下载网络图片
                var a = document.createElement('a');
                a.download = this.imageUrl || 'pic';
                a.href = this.imageUrl;
                a.click();
              },
              change: () => {
                this.showPreview = !this.showPreview;
              },
            };
            Fn[type]();
          },
        },

        created() {},
      });
    </script>
  </body>
</html>

文章来源:https://blog.csdn.net/weixin_65084919/article/details/134897108
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