mohcanohca

@vogloblinsky Did you change the samples' code to make it running successfully on Chrome Dev 72.0.3636.14? I have tried many versions of Chrome Dev and Chrome Canary, but none could...

@vogloblinsky it could not get xr attribute from navigator, so the page show unsupported browsers directly. I try your project on the Chrome Dev 72, it could not work. Could...

@vogloblinsky I have tried the URL on Chrome Dev 72.0.3626.14 with flags enabled again, but it still doesn't work. And whhen I open `chrome://inspect`, I found the `navigator.xr` was undefined....

@vogloblinsky Does this codelab still work fine on Chrome dev v72? My phone is Pixel 2 XL, Android 9. I have tried it on the version you mentioned, but it...

@vogloblinsky Does this codelab still work fine on Chrome dev v72? My phone is Pixel 2 XL, Android 9. I have tried it on the version you mentioned, but it...

>  > 看来我还是没懂原型链 。。。 Object.toString是将Object作为一个对象访问，Object自身没有属性toString，toString在Object的原型链上，Object.__proto__===Funtion.prototype，toString是Function.prototype的一个属性  MDN中说，Function 对象覆盖了从 Object 继承来的 Object.prototype.toString 方法。函数的 toString 方法会返回一个表示函数源代码的字符串。具体来说，包括 function关键字，形参列表，大括号，以及函数体中的内容。若 this 不是 Function 对象，则 toString() 方法将抛出 TypeError异常  不知道有没有对楼上的问题有一点帮助，如果有不对的地方，欢迎指出~