How to v-if inside one tag in template vue?

Question

Vue.js

Hey! :)
there is such a template:

<template>
...
  <a :href="`/${param._id}`" v-if="!param.new" style="opacity:.5">
  <a :href="`/${param._id}`" v-if="param.new">
...
</template>

I need to add a style property if the param.new value is missing.
Judging by the documentation, v-if can only be set in a similar way,
but is there any more traditional one, within 1 tag?
something like
{{if param.new}}style=""{{/if}}
don't want to somehow duplicate tags like this

Answer 1

Assign classes, not styles: Well, or in style, enter properties from data.

Answer 2

Vue has very good documentation in Russian https://ru.vuejs.org/v2/guide/class-and-style.html