var time = new Date(new Date().setHours(0, 0, 0, 0));
console.log(time)

取時間戳：

var timeStamp = new Date(new Date().setHours(0, 0, 0, 0)) / 1000;
console.log(timeStamp)

取幾天前的時間戳

var timeStamp = new Date(new Date().setHours(0, 0, 0, 0)) / 1000;
//一天是86400秒，n天前的時間戳
var nDayAgo = timeStamp - 86400 * n;
console.log
 
(nDayAgo)

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