之前canvas创建好好的然后模拟器正常运行，在我的手机上真机调试就报错。 手机微信版本： 8.0.42 手机基础库： 3.1.4 手机系统：IOS 17.1 VM13:2 SystemError (appServiceSDKScriptError) Cannot read property 'createCanvas' of undefined TypeError: Cannot read property 'createCanvas' of undefined     at y1 (eval at Ce.t.call.document (http://127.0.0.1:34344/remote-debug/runtime.js?devtools_ignore=true:1:18937), <anonymous>:2:1567216)     at new b1 (eval at Ce.t.call.document (http://127.0.0.1:34344/remote-debug/runtime.js?devtools_ignore=true:1:18937), <anonymous>:2:1567839)     at b3 (eval at Ce.t.call.document (http://127.0.0.1:34344/remote-debug/runtime.js?devtools_ignore=true:1:18937), <anonymous>:2:1611032)     at eval (eval at Ce.t.call.document (http://127.0.0.1:34344/remote-debug/runtime.js?devtools_ignore=true:1:18937), <anonymous>:2:1611918)     at Generator.next (<anonymous>)     at n (eval at Ce.t.call.document (http://127.0.0.1:34344/remote-debug/runtime.js?devtools_ignore=true:1:18937), <anonymous>:2:3597)     at s (eval at Ce.t.call.document (http://127.0.0.1:34344/remote-debug/runtime.js?devtools_ignore=true:1:18937), <anonymous>:2:3800)     at G (eval at Ce.t.call.document (http://127.0.0.1:34344/remote-debug/runtime.js?devtools_ignore=true:1:18937), <anonymous>:2:70958)     at eval (eval at Ce.t.call.document (http://127.0.0.1:34344/remote-debug/runtime.js?devtools_ignore=true:1:18937), <anonymous>:2:72585)     at I (eval at Ce.t.call.document (http://127.0.0.1:34344/remote-debug/runtime.js?devtools_ignore=true:1:18937), <anonymous>:2:40657)