<template>
    <div class="demo-avatar">
        <Avatar :style="{background: color}">{{ user }}</Avatar>
        <Button size="small" @click="handleChange">Change</Button>
    </div>
</template>
<script>
    const UserList = ['二', '小二', '三', '二个人'];
    const ColorList = ['#f56a00', '#7265e6', '#ffbf00', '#00a2ae'];

    export default {
        data () {
            return {
                user: UserList[0],
                color: ColorList[0]
            }
        },
        methods: {
            handleChange () {
                const index = UserList.indexOf(this.user);
                this.user = index < UserList.length - 1 ? UserList[index + 1] : UserList[0];
                this.color = index < ColorList.length - 1 ? ColorList[index + 1] : ColorList[0];
            }
        }
    }
</script>