As follows, after obtaining the data, you should modify the Content to html and bind it using the v-html command:

<template>
    <ul v-for="item in commentList">
        <li>
            <p v-html='item.Content'></p>
        </li>
    </ul>
</template>

<script>
    export {
        data() {
            return {
                commentList: []
            }
        },
        created() {
            this.$http.get('api/get-commentlist?article_id=1').then((res) => {
                res = res.body
                res.list.forEach((item, i) => {
                    // sdfsafs[face-1]sad[face-2] 
                    // 将被替换为 
                    // sdfsafs<img src="face-1.jpg">sad<img src="face-2.jpg">
                    // ，请自行根据需要修改
                    item.Content = item.Content.replace(/\[face\-(\d+)\]/g, '<img src="face-.jpg">')
                })
                this.commentList = res.list
            })
        }
    }
</script>

--- Supplement ---

The second parameter of the .replace() method also supports the use of function returns, which can achieve more complex replacements, such as:

item.Content = item.Content.replace(/\[(.+)\]/g, function(word, ){
  return '<img src="/static/img/'+ this.face[].src +'" />'
})

v-html?

It is recommended to use v-ifBetter

Use innerHTML for native, html() for jq;

Has anyone encountered the same problem~