此问题大家都解决了吗？我这里是用canvas 2d在iPad上报错，如果是用webgl就没有问题。真机调试报错如下： runtime.js?devtools_ignore=true:1 [Violation] 'message' handler took 258ms VM14:2 Unhandled promise rejection TypeError: r.Canvas is not a constructor     at n.value (eval at n.call.document (runtime.js?devtools_ignore=true:1), <anonymous>:2:742386)     at n.value (eval at n.call.document (runtime.js?devtools_ignore=true:1), <anonymous>:2:626107)     at t (eval at n.call.document (runtime.js?devtools_ignore=true:1), <anonymous>:2:626279)     at n.value (eval at n.call.document (runtime.js?devtools_ignore=true:1), <anonymous>:2:626368)     at eval (eval at n.call.document (runtime.js?devtools_ignore=true:1), <anonymous>:2:1244118)     at new T (eval at n.call.document (runtime.js?devtools_ignore=true:1), <anonymous>:2:66743)     at t (eval at n.call.document (runtime.js?devtools_ignore=true:1), <anonymous>:2:1244080)     at eval (eval at n.call.document (runtime.js?devtools_ignore=true:1), <anonymous>:2:1244135)     at Array.forEach (<anonymous>)     at r (eval at n.call.document (runtime.js?devtools_ignore=true:1), <anonymous>:2:1243340) eval @ VM14:2 e.exports @ VM14:2 eval @ VM14:2 e.exports @ VM14:2 y.<computed> @ VM14:2 r @ VM14:2 eval @ VM14:2 eval @ VM14:2 eval @ VM14:2 setTimeout (async) setTimeout @ VM14:2 _.now.f.addEventListener.f.importScripts.i @ VM14:2 h @ VM14:2 M @ VM14:2 eval @ VM14:2 e @ VM14:2 e.exports @ VM14:2 y.<computed> @ VM14:2 r @ VM14:2 eval @ VM14:2 eval @ VM14:2 eval @ VM14:2 setTimeout (async) setTimeout @ VM14:2 _.now.f.addEventListener.f.importScripts.i @ VM14:2 h @ VM14:2 o @ VM14:2 eval @ VM14:2 D @ VM14:2 B @ VM14:2 eval @ VM14:2 success @ VM14:2 eval @ VM14:2 y @ VM14:2 v @ VM14:2 eval @ VM14:2 v @ VM14:2 u @ runtime.js?devtools_ignore=true:1 w @ runtime.js?devtools_ignore=true:1 ke.onmessage @ runtime.js?devtools_ignore=true:1