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获取1天前的时间:
var curTime = new Date().getTime();
var startDate = curTime - (1 * 3600 * 24 * 1000);
startDate = new Date(startDate).format('Y-m-d H:i:s');
获取3天前的时间:
var curTime = new Date().getTime();
var startDate = curTime - (3 * 3600 * 24 * 1000);
startDate = new Date(startDate).format('Y-m-d H:i:s');
获取7天前的时间:
var curTime = new Date().getTime();
var startDate = curTime - (7 * 3600 * 24 * 1000);
startDate = new Date(startDate).format('Y-m-d H:i:s');
获取n天前的时间:
var curTime = new Date().getTime();
var startDate = curTime - (n * 3600 * 24 * 1000);
startDate = new Date(startDate).format('Y-m-d H:i:s');