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fix typo in computed guide #121

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2 changes: 1 addition & 1 deletion source/guide/computed.md
Original file line number Diff line number Diff line change
Expand Up @@ -89,7 +89,7 @@ var vm = new Vue({
})
```

In the example above, the computed property relies on `vm.msg`. Because this is an observed data property on the Vue instance, it is considered a reactive dependency. Whenever `vm.msg` is changed, `vm.example`'s value will be re-evaludated.
In the example above, the computed property relies on `vm.msg`. Because this is an observed data property on the Vue instance, it is considered a reactive dependency. Whenever `vm.msg` is changed, `vm.example`'s value will be re-evaluated.

However, `Date.now()` is **not** a reactive dependency, because it has nothing to do with Vue's data observation system. Therefore, when you programatically access `vm.example`, you will find the timestamp to remain the same unless `vm.msg` triggered a re-evaluation.

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