When you need to retrieve component data, there are two ways to do so: $vm.user and $vm.$data.user. Both methods achieve the same result in terms of setting and retrieving data. However, the question arises as to why there are two separate ways to access the data. What distinguishes these two approaches and which one is preferable to use?
$information represents the specific data object of the component. Vue provides a convenient way to access this data by proxying it, similar to methods, computed properties, and watchers.
When it comes to performance, JavaScript engines excel at optimizing object access, making the difference between direct access and proxy access negligible. Therefore, using the proxy access ($vm.details) is recommended for better code readability.
In rare scenarios where deep-watching all of a component's data is necessary, $data becomes invaluable. For instance, you can achieve this by utilizing the following structure:
watch: {
$data: {
handler() { /* ... */ },
deep: true
}
},
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