How to save an existing content? - vue.js

Question

I can't get how to use v-html to save an existing content. For example:
<div ref="content" v-html="content">Hello, World! A lot of divs</div>
How to make to div content was replace only when I will assign a some not null value with content? Or how to make it in another way? Or is the single way to request div content asynchronously?
The next way works, of course, but I lose a data binding.
this.$refs['content'].innerHTML = "New content";
P.S. I am migrating from jQuery and still can't think in Vue.js philosophy clearly.

Answer 1

Actualy, you must read vue documentation.
In your component you must declare content in data, and simply change it in oher places, i.e. in button's click handler or inside component's methods:
new Vue({
el: "#root",
data: function () {
return {
content: 'Hello, World! A <b>lot</b> of divs'
};
},
methods: {
changeText: function() {
this.content = 'This text from component';
}
}
});
<script src="https://cdn.jsdelivr.net/npm/vue"></script>
<div id="root">
<div v-html="content"></div>
<button v-on:click="content = 'This text from button'">Click me</button>
<button v-on:click="changeText">And me</button>
</div>

Answer 2

You could assign a default value to content.
data () {
return {
content: 'Hello, World! A lot of divs'
}
}
When you'll assign a new value to content it will get rendered.
Another way would be to check if content is not null and have 2 different divs using v-if/v-else for conditional rendering.
<div v-if="content" v-html="content"></div>
<div v-else>Hello, World! A lot of divs</div>
and the script
export default {
name: 'customComponent',
data () {
return {
content: null
}
}
}