组件传值

methods:{

            addComment(){

                console.log(11);

                let username = this.username.trim();

                let comment = this.comment.trim()

                // 先期判断

                if(!username){

                    alert("评论的用户名不能为空")

                    return;

                }

                if(!comment){

                    alert("评论内容不能为空");

                    return

                }

                console.log(this.username);

                console.log(this.comment);

                    //传值

                    this.$emit("addComment",{

                        name:this.username,

                        comment:this.comment

                    }),

                    // 清空数据

                this.username = ''

                this.comment = ''

            }

        }