mounted () {   

    this.scrollToBottom();

},

//每次页面渲染完之后滚动条在最底部

updated:function(){   

    this.scrollToBottom();

},

methods:{   

    scrollToBottom: function () {     

        this.$nextTick(() => {     

            var container = this.$el.querySelector(".chatBox-content-demo");        

            container.scrollTop = container.scrollHeight;    

        })

    }

}