VUE图片显示，图片动态拼接host的方法原创

 getBanner:function(){
                const params = new URLSearchParams();
                params.append(token, this.token);
                axios({
                    url:host+Sys/findAllBanner,
                    method:post,
                    data:params
                }).then((res) => {
                    console.log(res)
                    if(res.data.code==0){
                        // this.bannerList
                        this.bannerList = res.data.list
                        for(var i =0 ;i