JS计算某个日期至今天的天数

兼容IE8

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// time格式为 '2018-08-01或2018/08/01或2018/8/1'
var daysComputed = function(time) {
var oldTimeFormat = new Date(time.replace(/-/g, '/'));
var nowDate = new Date();
if(nowDate.getTime() - oldTimeFormat.getTime() > 0) {
var times = nowDate.getTime() - oldTimeFormat.getTime();
var days = parseInt(times / (60*60*24*1000));
return days;
} else {
throw('传入时间不能大于当前日期');
}
}
daysComputed('2017-11-1');

兼容现代浏览器

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// time格式为 '2018-08-01或2018/08/01或2018/8/1'
const daysComputed = time => {
let oldTimeFormat = new Date(time)
let nowDate = new Date()
if(nowDate.getTime() - oldTimeFormat.getTime() > 0) {
let times = nowDate.getTime() - oldTimeFormat.getTime()
let days = parseInt(times / (60*60*24*1000))
return days
} else {
throw('传入时间不能大于当前日期')
}
}
daysComputed('2017-11-1')