在當(dāng)前的JavaScript中，并沒(méi)有枚舉這個(gè)概念，在某些場(chǎng)景中使用枚舉更能保證數(shù)據(jù)的正確性，減少數(shù)據(jù)校驗(yàn)過(guò)程，下面就介紹一下JavaScript如何模擬實(shí)現(xiàn)枚舉效果。

let days;(function (days) { days[days['Sunday'] = 0] = 'Sunday'; days[days['Monday'] = 1] = 'Monday'; days[days['Tuesday'] = 2] = 'Tuesday'; days[days['Wednesday'] = 3] = 'Wednesday'; days[days['Thursday'] = 4] = 'Thursday'; days[days['Friday'] = 5] = 'Friday'; days[days['Saturday'] = 6] = 'Saturday';})(days || (days = {}));

這個(gè)時(shí)候days對(duì)象基本實(shí)現(xiàn)了枚舉效果，可以通過(guò)枚舉值或索引去訪問(wèn)days對(duì)象，但枚舉有個(gè)重要特別是不能被修改，這個(gè)時(shí)候days是可以隨意修改的；可以通過(guò)Object.freeze函數(shù)讓對(duì)象不改修改，重新導(dǎo)出一個(gè)不可以修改的對(duì)象，完整代碼如下：

let days;(function (days) { days[days['Monday'] = 1] = 'Monday'; days[days['Tuesday'] = 2] = 'Tuesday'; days[days['Wednesday'] = 3] = 'Wednesday'; days[days['Thursday'] = 4] = 'Thursday'; days[days['Friday'] = 5] = 'Friday'; days[days['Saturday'] = 6] = 'Saturday'; days[days['Sunday'] = 0] = 'Sunday';})(days || (days = {}));//導(dǎo)出可枚舉對(duì)象export EnumWeek = Object.freeze(days)

以上就是怎樣用JS模擬實(shí)現(xiàn)枚舉的詳細(xì)內(nèi)容，更多關(guān)于JS的資料請(qǐng)關(guān)注好吧啦網(wǎng)其它相關(guān)文章！