js枚举类型enum用法

const Color = Object.freeze({
    RED: 'RED',
    GREEN: 'GREEN',
    BLUE: 'BLUE'
});

function getColorName(color) {
    switch (color) {
        case Color.RED:
            return '红色';
        case Color.GREEN:
            return '绿色';
        case Color.BLUE:
            return '蓝色';
        default:
            return '未知颜色';
    }
}

console.log(getColorName(Color.RED)); // 输出：红色

// 字符串枚举
const Status = Object.freeze({
    PENDING: 'PENDING',
    APPROVED: 'APPROVED',
    REJECTED: 'REJECTED'
});

// 数字枚举
const Priority = Object.freeze({
    LOW: 1,
    MEDIUM: 2,
    HIGH: 3
});

// 定义枚举
const Direction = Object.freeze({
    UP: 'UP',
    DOWN: 'DOWN',
    LEFT: 'LEFT',
    RIGHT: 'RIGHT'
});

// 使用枚举
function move(direction) {
    switch (direction) {
        case Direction.UP:
            console.log('向上移动');
            break;
        case Direction.DOWN:
            console.log('向下移动');
            break;
        case Direction.LEFT:
            console.log('向左移动');
            break;
        case Direction.RIGHT:
            console.log('向右移动');
            break;
        default:
            console.log('未知方向');
    }
}

move(Direction.UP); // 输出：向上移动