<div id="app">
<p :title="new Date()">hover
{{ msg }}
</div>
<div id="app">
<p :title="new Date()">hover
{{ msg }}
</div>title is put in store. If you want to control what changes, change
according to the subject, the value of title will change only when the page is refreshed. new Date () is not a responsive dependency. If title gets the value of new Date () when the page is initialized, it will not change again. If you need to change it, use js to control it
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