js中日期转换为时间戳

 function dateToTimestamp(date) {
                //方法一
         var newDate = new Date();
         newDate.setFullYear(date.substring(0,4));
         newDate.setMonth(date.substring(5,7)-1);
         console.log('3--' + date.substring(8,10));
         newDate.setDate(date.substring(8,10));
         newDate.setHours(date.substring(11,13));
         newDate.setMinutes(date.substring(14,16));
         newDate.setSeconds(date.substring(17,19));
         console.log('date',newDate);
         return Date.parse(newDate)/1000;
                 //方法二
         date = date.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
         date = new Date(date); // 构造一个日期型数据，值为传入的字符串
         var time = date.getTime();
         time = time / 1000;
         return time;
     }