用uniapp的uni.requireNativePlugin('bindingx')插件，写个拖动，缩小，放大页面，用的页面是nvue

好的，下面是一个简单的示例代码：

1. 在 pages.json 中添加插件配置：

{
  "pages": [
    {
      "path": "pages/index/index",
      "style": {
        "navigationBarTitleText": "首页"
      },
      "usingComponents": {
        "van-button": "/static/vant/button/index"
      },
      "uni": {
        "enablePullDownRefresh": true,
        "disableScroll": false,
        "disableSwipeBack": false,
        "pageOrientation": "portrait",
        "backgroundColor": "#f8f8f8",
        "pullRefreshOptions": {
          "style": "default",
          "textColor": "#000000",
          "refreshingText": "正在刷新...",
          "completeText": "刷新完成",
          "failText": "刷新失败"
        },
        "navigationBarBackgroundColor": "#ffffff",
        "navigationBarTextStyle": "black",
        "navigationBarTitleText": "uni-app",
        "backgroundTextStyle": "dark",
        "backgroundColorTop": "#ffffff",
        "backgroundColorBottom": "#ffffff",
        "usingComponents": {
          "van-button": "/static/vant/button/index"
        },
        "plugins": {
          "bindingx": {
            "version": "1.0.0",
            "provider": "dcloudio.unipluginbindingx"
          }
        }
      }
    }
  ]
}

2. 在 index.nvue 中添加一个可拖动的元素：

<template>
  <view class="box" :style="{ transform: `translate3d(${x}px, ${y}px, 0) scale(${scale})` }">
    <text>我可以拖动哦~~~</text>
  </view>
</template>

<style>
  .box {
    position: absolute;
    width: 200px;
    height: 200px;
    background-color: #f1f1f1;
    border: 1px solid #ccc;
    font-size: 18px;
    text-align: center;
    line-height: 200px;
    border-radius: 10px;
    user-select: none;
    -webkit-user-select: none;
    -webkit-touch-callout: none;
  }
</style>

3. 在 index.js 中添加拖动和缩放的逻辑：

import Vue from 'vue';

const bindingx = uni.requireNativePlugin('bindingx');

Vue.mixin({
  mounted() {
    this.bindEvent();
  },
  methods: {
    bindEvent() {
      const box = this.$refs.box;
      const start = { x: 0, y: 0 };
      let lastX = 0;
      let lastY = 0;
      let lastScale = 1;
      let isMove = false;

      box.addEventListener('touchstart', (event) => {
        const touches = event.touches;
        if (touches.length === 1) {
          const touch = touches[0];
          start.x = touch.pageX;
          start.y = touch.pageY;
        } else {
          isMove = true;
          const touch1 = touches[0];
          const touch2 = touches[1];
          lastX = (touch1.pageX + touch2.pageX) / 2;
          lastY = (touch1.pageY + touch2.pageY) / 2;
          lastScale = this.scale;
        }
      });

      box.addEventListener('touchmove', (event) => {
        const touches = event.touches;
        if (touches.length === 1 && !isMove) {
          const touch = touches[0];
          const moveX = touch.pageX - start.x;
          const moveY = touch.pageY - start.y;
          box.style.transform = `translate3d(${moveX}px, ${moveY}px, 0) scale(${this.scale})`;
        } else if (touches.length === 2) {
          isMove = true;
          const touch1 = touches[0];
          const touch2 = touches[1];
          const x = (touch1.pageX + touch2.pageX) / 2;
          const y = (touch1.pageY + touch2.pageY) / 2;
          const deltaX = x - lastX;
          const deltaY = y - lastY;
          const scale =
            lastScale *
            Math.sqrt(
              (touch1.pageX - touch2.pageX) *
                (touch1.pageX - touch2.pageX) +
                (touch1.pageY - touch2.pageY) *
                  (touch1.pageY - touch2.pageY)
            ) /
            Math.sqrt(
              (event.touches[0].pageX - event.touches[1].pageX) *
                (event.touches[0].pageX - event.touches[1].pageX) +
                (event.touches[0].pageY - event.touches[1].pageY) *
                  (event.touches[0].pageY - event.touches[1].pageY)
            );
          this.scale = scale;
          box.style.transform = `translate3d(${deltaX}px, ${deltaY}px, 0) scale(${scale})`;
        }
      });

      box.addEventListener('touchend', () => {
        if (!isMove) {
          bindingx.create({
            eventType: 'pan',
            selector: '._bindingx_box_',
            props: [
              {
                element: 'transform.translateX',
                expression: 'x'
              },
              {
                element: 'transform.translateY',
                expression: 'y'
              }
            ]
          }).interact(this.$refs.box, {
            startX: 0,
            startY: 0,
            touchAction: 'pan-y',
            animation: {
              duration: 1000
            }
          });
        }
        isMove = false;
      });
    }
  },
  data() {
    return {
      x: 0,
      y: 0,
      scale: 1
    };
  }
});

export default {
  methods: {
    onClick() {
      console.log('click');
    }
  }
};

这样，就可以实现一个简单的拖动、缩放页面元素的功能了。注意，这里使用了 `bindingx` 插件来实现拖动动画效果，需要在 `touchend` 事件中检测拖动距离，如果没有拖动，则触发 `bindingx` 动画效果。