JS 时间字符串转换成时间

 /**
  * 把时间字符串转换成绝对时间
  *
  * @param datastr 时间格式为：2012-12-26 16:46:46
  * @return
  */
 function timeExchange(datastr) {
  var date = new Date();
  var perfex = datastr.split(" ")[0];
  var surfex = datastr.split(" ")[1]
  if (perfex) {
   var y = perfex.split("-")[0] / 1;
   //因为月是从0开始的，所以减一
   var m = perfex.split("-")[1] / 1-1;
   var d = perfex.split("-")[2] / 1;
   date.setFullYear(y, m, d);
  }
  if (surfex) {
   var h = surfex.split(":")[0] / 1;
   var m = surfex.split(":")[1] / 1;
   var s = surfex.split(":")[2] / 1;
   date.setHours(h, m, s, 0);
  }
  return date.getTime();
 }