javascript - JS如何计算前几个月？

Question

在 JavaScript 中，

如何以最快的方式计算从本月(一年)开始的所有月份？

比如说，对于输入:Jun 应该预期 Jun,May,Apr,...Jan,Dec...Jun

Answer 1

您可以遵循这样的方法:

const MONTHS = ["Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"]

function getPreviousMonths(currentMonth) {
    let index = MONTHS.indexOf(currentMonth);
    let result = [];

    for(let j = 0; j < MONTHS.length; j++) {
        let access = index - j;
        if(access < 0) {
            access += MONTHS.length;
        }
        result.push(MONTHS[access]);
    }

    return result.join(",");
}