JS如何获取最近一个月或指定天数的日期

num为传递的天数 (传递30查最近一个月)

get_date(num) {
    let dateArray = []
        //获取今天日期
        let myDate = new Date()
        let today = myDate.getFullYear() + '-' + (myDate.getMonth() + 1) + "-" + myDate.getDate();
        myDate.setDate(myDate.getDate() - num)
        let dateTemp;  // 临时日期数据
        let flag = 1;
        for (let i = 0; i < num; i++) {
            dateTemp = myDate.getFullYear() + '-' + (myDate.getMonth() + 1) + "-" + myDate.getDate()
            dateArray.push({
                date: dateTemp
            })
            myDate.setDate(myDate.getDate() + flag);
        }
        dateArray.push({
            date: today
        })
        let arr = []
        let newArr = []
        dateArray.forEach(item => {
            arr.push(item.date.split('-'))
        })
        for (let i = 0; i < arr.length; i++) {
            if (arr[i][1] < 10) {
                arr[i][1] = "0" + arr[i][1]
            }
            if (arr[i][2] < 10) {
                arr[i][2] = "0" + arr[i][2]
            }
        }
        for (let j = 0; j < arr.length; j++) {
            newArr.push(arr[j].join("-"))
        }
        // 当前日期
        let nowDate = newArr[newArr.length - 1]
        // 30天前日期 
        let previousDate = newArr[0]
        // 日期区间数组
        console.log(nowDate)
        console.log(previousDate)
        console.log(newArr)
      return newArr
}

参考链接：blog.csdn.net/Gik99/artic…