jquery获得前一天0点，前一周0点，指定月份的时间戳

// 今天 var today = new Date(); today.setHours(0); today.setMinutes(0); today.setSeconds(0); today.setMilliseconds(0); alert(today); var oneday = 1000 * 60 * 60 * 24; // 昨天 var yesterday = new Date(today - oneday); alert(yesterday); // 上周一 var lastMonday = new Date(today- oneday * (today.getDay() + 6)); alert(lastMonday); // 上个月1号 var lastMonthFirst = new Date(today - oneday * today.getDate()); lastMonthFirst = new Date(lastMonthFirst - oneday * (lastMonthFirst.getDate() - 1)); alert(lastMonthFirst);