echats--visualmap

            visualMap: [
                    {
                        top: 20,
                        left: 0,
                        right: null,
                        // 设置文本为红色
                        textStyle: {
                            color: ‘yellow‘
                        },
                        selectedMode: false,
                        dimension: 3,
                        categories: [‘已建‘, ‘在建‘, ‘拟建‘],
                        inRange: {
                            color: [‘#62f962‘, ‘yellow‘, ‘red‘]
                        },
                        outOfRange: {
                            color: ‘orange‘,
                        }
                    }
            ],