小程序跳转到另外一个有camera预览的小程序，camera预览为黑屏

camera的尺寸为固定尺寸

    wx.navigateToMiniProgram({
      appId: this.data.appId,
      path: this.data.path,
      extraData: JSON.parse(""+this.data.extraData),
      envVersion: this.data.envVersion,
      success(res) {
        // 打开成功
        console.log(res)
      }
    })

  <camera
   style="width: 100%; height: 400px;"
   device-position="back"
   binderror="error" 
   flash="on"></camera>