话不多说，上代码
<!DOCTYPE html>
<html>
<head><title>js日期相减函数</title><script type="text/javascript">window.onload=function(){console.log(DateMinus('2018-8-8'));}//计算日期与当前日期相减得到天数 function DateMinus(sDate){ var sdate = new Date(sDate.replace(/-/g, "/")); var now = new Date(); var days = now.getTime() - sdate.getTime(); var day = parseInt(days / (1000 * 60 * 60 * 24)); return day; }</script>
</head>
<body></body>
</html>