JS 获取近30天的时间

在JavaScript中，有多种方法可以获取近30天的时间，以下为你介绍几种常见的方式： ### 使用纯JavaScript获取近30天日期 ```javascript function getLast30Days() { const timeArr = []; const now = new Date(); for (let i = 0; i < 30; i++) { const newDate = new Date(now); newDate.setDate(now.getDate() - i); const year = newDate.getFullYear(); const month = String(newDate.getMonth() + 1).padStart(2, '0'); const day = String(newDate.getDate()).padStart(2, '0'); const dateStr = `${year}-${month}-${day}`; timeArr.push(dateStr); } return timeArr; } const last30Days = getLast30Days(); console.log(last30Days); ``` 这种方法是通过循环30次，每次将当前日期减去相应的天数来获取过去30天的日期。 ### 在Vue中动态获取近30天日期 ```javascript // 假设在Vue组件中 export default { data() { return { dateDate30: 30, y: '', m: '', d: '', }; }, methods: { times(n1, n2, n3 = 0) { let date; if (n1) { date = new Date(n1, n2, n3); } else { date = new Date(); } this.y = date.getFullYear(); this.m = date.getMonth(); this.d = date.getDate(); }, timeList() { this.times(); let y = this.y; let m = this.m; let d = this.d; const dateNum = this.dateDate30; const dataKey = []; while (true) { for (let i = d; i > d - dateNum; i--) { if (i === 0) break; const ms = (m + 1).toString().padStart(2, '0'); const is = i.toString().padStart(2, '0'); dataKey[`${ms}${is}`] = `${m + 1}月${i}`; } if (dateNum - d >= 0) { dateNum -= d; this.times(y, m); y = this.y; m = this.m; d = this.d; } else { break; } } console.log(dataKey); }, }, mounted() { this.timeList(); }, }; ``` 该方法在Vue组件中使用，通过循环和日期计算获取近30天的日期信息。 ### 封装函数获取近30天日期数组 ```javascript function getNearMonth() { const timeArr = []; const time = new Date(); const year = time.getFullYear(); const lastMonth = time.getMonth(); const nowMonth = time.getMonth() + 1; function getDaysInOneMonth(year, lastMonth) { lastMonth = parseInt(lastMonth, 10); const newTime = new Date(year, lastMonth, 0); return newTime.getDate(); } const lastDays = getDaysInOneMonth(year, lastMonth); const nowDays = getDaysInOneMonth(year, nowMonth); let day = time.getDate() + 1; for (let i = 0; i < nowDays; i++) { day = day - 1; if (day <= 0) { day = day + lastDays; } timeArr.push(day); } timeArr.reverse(); timeArr.splice(1, nowDays); console.log(timeArr); return timeArr; } getNearMonth(); ``` 这个方法将获取近30天日期数组封装成了一个函数，通过计算上个月和本月的天数来生成日期数组。