将is的值绑定为一个变量，is就变成了v-bind:is="变量名"，即 ：is="变量名"。当变量名赋值为哪个自定义组件名时，拥有：is=“变量名”属性的元素就会渲染为哪个组件。由于is的值不再是一章节中的静态的值，而是进行了数据绑定，所以绑定的变量要在data中定义过的

示例 

<template>
    <div class="page-header-index-wide">
        <a-card :bordered="false" :bodyStyle="{ padding: '16px 0', height: '100%' }" :style="{ height: '100%' }">
            <div class="account-settings-info-main" :class="{ mobile: isMobile }">
                <div class="account-settings-info-left">
                    <a-menu
                        :mode="isMobile ? 'horizontal' : 'inline'"
                        :style="{ border: '0', width: isMobile ? '560px' : 'auto' }"
                        :selectedKeys="openKeys"
                        type="inner"
                        @click="changeMenu"
                    >
                        <a-menu-item key="BaseSetting">基本设置 </a-menu-item>
                        <a-menu-item key="changePassword">修改密码 </a-menu-item>
                    </a-menu>
                </div>
                <div class="account-settings-info-right">
                    <component :is="isCompenent"> </component>
                </div>
            </div>
        </a-card>
    </div>
</template>

<script>
import { RouteView } from '@/layouts'
import { baseMixin } from '@/store/app-mixin'
import BaseSetting from './BaseSetting' // 页面A
import changePassword from './changePassword' // 页面B
export default {
    components: {
        RouteView,
        BaseSetting,
        changePassword,
    },
    mixins: [baseMixin],
    data() {
        return {
            // horizontal  inline
            mode: 'inline',
            isCompenent: 'BaseSetting',
            openKeys: ['BaseSetting'],
            selectedKeys: [],
        }
    },
    mounted() {},
    methods: {
        changeMenu(openKeys) {
            this.openKeys = openKeys.keyPath
            this.isCompenent = openKeys.key
        },
    },
}
</script>

<style lang="less" scoped>
...
</style>