var time1 = new Date("2021-04-16 00:00");
var time2 = new Date().getTime();
console.log(time1);
console.log(time2); // 2021-04-16 39:30
var diff = time2 -time1;
var hour = diff/(1000*60);
console.log(hour);
还有一种结果是负的

注意点,2个时间虽然不是同格式,但是也能相减。
上面的计算结果是,相关几分,如果算几个小时,再*60
var hour = diff/(1000*60*60);
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