https://github.com/wechat-miniprogram/minigame-unity-webgl-transform/blob/main/Design/OptimizationPerformence.md

根据文档中的推荐，依靠devicePixelRatio限制分辨率，会报“Cannot assign to read only property 'devicePixelRatio' of object '#<Window>' as game.js...”

if(wx.getSystemInfoSync().platform == 'ios') window.devicePixelRatio = 2;