如何只比较日期部分而不比较JavaScript中的时间？
要仅比较日期部分而不比较时间，请使用setHours()方法设置小时。这将限制比较时间，同时比较和时间-
示例
<!DOCTYPE html>
<html>
<body>
<script>
var date1, date2;
date1 = new Date();
date1.setHours(0,0,0,0);
document.write(date1);
date2 = new Date( "Jan 01, 2018" );
document.write("<br>" +date2);
if (date1.getTime() === date2.getTime()) {
document.write("<br>Both the dates are equal.");
} else {
document.write("<br>Both the dates aren't equal.");
}
</script>
</body>
</html>输出结果
Fri May 25 2018 00:00:00 GMT+0530 (India Standard Time) Mon Jan 01 2018 00:00:00 GMT+0530 (India Standard Time) Both the dates aren't equal.