wx.createInnerAudioContext() 怎么实现退到后台继续播放声音？

https://developers.weixin.qq.com/miniprogram/introduction/qrcode.html wxc4e3caa4a5b73add

刚刚 在iphone6下测试，点击非首页左上角进入首页后 wx.getSystemInfoSync().windowHeight 获取成了603。这是不是bug？

[图片]

https://developers.weixin.qq.com/s/W0wv9lmf72eG

https://developers.weixin.qq.com/s/8zvRolm676eZ

Failed to execute 'drawImage' on 'CanvasRenderingContext2D': The provided value is not of type '(CSSImageValue or HTMLImageElement or SVGImageElement or HTMLVideoElement or HTMLCanvasElement or ImageBitmap or OffscreenCanvas)';at SelectorQuery callback function TypeError: Failed to execute 'drawImage' on 'CanvasRenderingContext2D': The provided value is not of type '(CSSImageValue or HTMLImageElement or SVGImageElement or HTMLVideoElement or HTMLCanvasElement or ImageBitmap or OffscreenCanvas)'

基础库2.7.0 微信：7.0.10 Android部分手机如 华为系列手机 p10 p20 生成图片是黑色

wx.previewImage 怎么获取关闭事件？ 使用onshow 不能解决实际问题。

wx.createInnerAudioContext();