problem description

I introduced velocity.js animation in vue, where velocity.js documents say that chain animation can be used, like this

the environmental background of the problems and what methods you have tried

I use it like this in vue, but I misreport
vue.esm.js?3153:1741 TypeError: this.$refs.rect.velocity is not a function

related codes

/ / Please paste the code text below (do not replace the code with pictures)

`

<div class="rect" ref="rect"></div>

`

`
mounted () {

this.$refs.rect.velocity({left: 200 }, { duration: 500 }).velocity("reverse", { duration: 2000 });

}
`

what result do you expect? What is the error message actually seen?