json 删除其中对象中的一个元素

methods: {
                    databuild(a) {
                        var menu_data = [{
                                "menuid": "1",
                                "menuname": "客户自助",
                                "path": "",
                                "parent": "-1",
                                "level": "1"
                            },
                            {
                                "menuid": "2",
                                "menuname": "",
                                "path": "",
                                "parent": "-1",
                                "level": "1"
                            },
                            {
                                "menuid": "3",
                                "menuname": "产品列表",
                                "path": "product_list.html",
                                "parent": "1",
                                "level": "2"
                            }
                        ];
                        //json的删除的方法
                        var newArr = new Array();
                        for (var i = 0; i < menu_data.length; i++) {
                            var j = menu_data[i];
                            if (j.menuname != undefined && j.menuname != "") {
                                newArr.push(j);
                            }
                        }
                        console.info(newArr);
                        //.filter 的删除的方法方法
                         buildjson=[];
                         buildjson = menu_data.filter(lesson => lesson.menuname !== '产品列表');
                         console.log(buildjson)
                        //vue的删除的方法  this.$delete
                        var a = [1, 2, 3, 4]
                        var b = [1, 2, 3, 4]
                        delete a[1]
                        console.log(a)
                        this.$delete(b, 2)
                        console.log(b)
                        console.log("练习vue delete的方法")
                    },
                },