转换单位：

var milliseconds = (startdate.getTime() - currentDate.getTime());
var seconds = milliseconds / 1000;
var minutes = seconds / 60;

或者，一体化：

var minutes = (startdate.getTime() - currentDate.getTime()) / 1000 / 60;

这最有可能给你一个大小数。对于舍入，请使用 Math.floor ， Math.ceil 或 Math.round 。

This will give you a big decimal most likely. For rounding, use Math.floor, Math.ceil, or Math.round.