js 给定时间,如'2013-08-30',换算和今天的天数差

 1 <script>
 2         function getGapDays(str) {
 3             var str = str.replace(/-/g,‘/‘); // 将-替换成/，因为下面这个构造函数只支持/分隔的日期字符串
 4             var date = new Date(str); // 构造一个日期型数据，值为传入的字符串
 5             var targetTime = date.getTime();
 6             var currentTime = Date.now();
 7             var gap, days;
 8             console.info(targetTime, currentTime)
 9             
10             if(currentTime < targetTime) {
11                 gap = targetTime - currentTime;
12                 days = Math.floor(gap/86400000);
13                 console.info(‘给定时间比当前时间多‘+days+‘天‘);
14             }
15             else if(currentTime === targetTime) {
16                 console.info(‘给定时间和当前时间相等‘); 
17             }
18             else {
19                 gap = currentTime - targetTime;
20                 days = Math.floor(gap/86400000);
21                 console.info(‘给定时间比当前时间少‘+days+‘天‘);
22             }
23         }
24         
25         getGapDays(‘2013-08-30‘);
26     </script>