微信开发者工具v1.02.1911180 最新版本，

由于camera不支持微信开发者工具调试，所以使用真机调试，手机安装的微信版本7.0.11

在引入插件中调用createOffscreenCanvas接口报2个异常错误

canvas: wx.createOffscreenCanvas()

2个异常报错的信息如下：

appServiceSDKScriptError (unknown)

Pt.default.OffscreenCanvas is not a constructor; at wx.createOffscreenCanvas

TypeError: Pt.default.OffscreenCanvas is not a constructor

    at Vt (eval at n.call.document (http://127.0.0.1:63151/remote-debug/runtime.js?devtools_ignore=true:1:8753), <anonymous>:2:809537)

    at Object.Wt (eval at n.call.document (http://127.0.0.1:63151/remote-debug/runtime.js?devtools_ignore=true:1:8753), <anonymous>:2:808231)

    at Object.f.(anonymous function) (eval at n.call.document (http://127.0.0.1:63151/remote-debug/runtime.js?devtools_ignore=true:1:8753), <anonymous>:2:888622)

    at Object.eval (eval at n.call.document (http://127.0.0.1:63151/remote-debug/runtime.js?devtools_ignore=true:1:8753), <anonymous>:2:587283)

    at Function.eval (eval at n.call.document (http://127.0.0.1:63151/remote-debug/runtime.js?devtools_ignore=true:1:8753), <anonymous>:2:1401835)

    at Object.eval (eval at n.call.document (http://127.0.0.1:63151/remote-debug/runtime.js?devtools_ignore=true:1:8753), <anonymous>:2:541980)

    at pe.onLaunch (weapp:///app.js:15:18)

    at pe.eval (eval at n.call.document (http://127.0.0.1:63151/remote-debug/runtime.js?devtools_ignore=true:1:8753), <anonymous>:2:1649604)

    at new pe (eval at n.call.document (http://127.0.0.1:63151/remote-debug/runtime.js?devtools_ignore=true:1:8753), <anonymous>:2:1650360)

    at Function.eval (eval at n.call.document (http://127.0.0.1:63151/remote-debug/runtime.js?devtools_ignore=true:1:8753), <anonymous>:2:1650774)

thirdScriptError (unknown)

Cannot assign to read only property 'btoa' of object '[object Window]';at App lifeCycleMethod onLaunch function

TypeError: Cannot assign to read only property 'btoa' of object '[object Window]'

    at e ([__wxPluginCode__]:1095:45)

    at Object.exports.setupWechatPlatform ([__wxPluginCode__]:1095:1483)

    at Object.exports.configPlugin ([__wxPluginCode__]:1071:148)

    at pe.onLaunch (weapp:///app.js:9:12)

    at pe.eval (eval at n.call.document (http://127.0.0.1:63151/remote-debug/runtime.js?devtools_ignore=true:1:8753), <anonymous>:2:1649604)

    at new pe (eval at n.call.document (http://127.0.0.1:63151/remote-debug/runtime.js?devtools_ignore=true:1:8753), <anonymous>:2:1650360)

    at Function.eval (eval at n.call.document (http://127.0.0.1:63151/remote-debug/runtime.js?devtools_ignore=true:1:8753), <anonymous>:2:1650774)

    at eval (eval at n.call.document (http://127.0.0.1:63151/remote-debug/runtime.js?devtools_ignore=true:1:8753), <anonymous>:2:1637680)

    at eval (weapp:///app.js:7:1)

    at require (eval at n.call.document (http://127.0.0.1:63151/remote-debug/runtime.js?devtools_ignore=true:1:8753), <anonymous>:2:1685185)