为什么在这边删了左的 v-if="$slots.left"，右边的就能在右边

<template>

<div class="mine-navbar">

<div class="mine-navbar-left" v-if="$slots.left">

<slot name="left"></slot>

</div>

<div class="mine-navbar-center" v-if="$slots.center">

<slot name="center"></slot>

</div>

<div class="mine-navbar-right" v-if="$slots.right">

<slot name="right"></slot>

</div>

</div>

</template>