先执行输入框显示，再执行focus

<view class="comment-input-wrap" :style="{display:(isShowCommentPanel?'block':'none')}" @click.stop>
	<input type="text" :focus="inputFocus" placeholder="请输入评论">
</view>

/**
* 展开评论输入框面板
*/
openCommentPanel(){
    this.$set(this,'isShowCommentPanel',true);
    setTimeout(()=>{
         this.$set(this,'inputFocus',true);
    },200)
}