Cannot read property 'record' of undefined

[dnlzsy]

文档写的非常棒，很好，学习了，非常感谢。
下面有一个小问题：
app.1305534f823567d76d8d.js:1 Uncaught (in promise) TypeError: Cannot read property 'record' of undefined
at Array. (app.1305534f823567d76d8d.js:1)
at o (vendor.2f2c77d66a53508c9986.js:17)
at vendor.2f2c77d66a53508c9986.js:17
at new Promise ()
at i. (vendor.2f2c77d66a53508c9986.js:17)
at t.exports (vendor.2f2c77d66a53508c9986.js:17)

[thoth-hank]

https://github.com/liangxiaojuan/vue-todos/blob/master/src/mock/mock.js#L64