• 微信小程序开发在使用 Canvas 进行真机调试的时候报错：

VM22:2 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>:2:1055836)
    at n.value (eval at n.call.document (runtime.js?devtools_ignore=true:1), <anonymous>:2:761772)
    at t (eval at n.call.document (runtime.js?devtools_ignore=true:1), <anonymous>:2:761939)
    at n.value (eval at n.call.document (runtime.js?devtools_ignore=true:1), <anonymous>:2:762028)
    at eval (eval at n.call.document (runtime.js?devtools_ignore=true:1), <anonymous>:2:1278758)
    at new E (eval at n.call.document (runtime.js?devtools_ignore=true:1), <anonymous>:2:67059)
    at Vc (eval at n.call.document (runtime.js?devtools_ignore=true:1), <anonymous>:2:1278720)
    at eval (eval at n.call.document (runtime.js?devtools_ignore=true:1), <anonymous>:2:1280188)
    at Array.forEach (<anonymous>)
    at r (eval at n.call.document (runtime.js?devtools_ignore=true:1), <anonymous>:2:1280166)

• 原因：canvas 2d和 webgl 暂不支持真机调试，请直接使用真机预览。