mini-ar-demo/miniprogram/pages/index/index.ts

// index.ts
// 获取应用实例
const app = getApp<IAppOption>()
Component({
  data: {
    width: 300,
    height: 300,
    renderWidth: 300,
    renderHeight: 300,
  },
  methods: {
    // 事件处理函数
    onLoad() {
      const info = wx.getSystemInfoSync();
      const width = info.windowWidth;
      const height = info.windowHeight;
      const dpi = info.pixelRatio;
      this.setData({
        width, height,
        renderWidth: width * dpi,
        renderHeight: height * dpi
      });
    },
 
  },
})