格式化日期，将毫秒转化成字符串的快捷函数

js毫秒转成日期

/**
 * Format Date 
 * usage:
 *  date2str(new Date(seconds*1000),"MM-dd hh:mm");
 */
date2str = function(x,y) {
  var z = {M:x.getMonth()+1,d:x.getDate(),h:x.getHours(),m:x.getMinutes(),s:x.getSeconds()};
  y = y.replace(/(M+|d+|h+|m+|s+)/g,function(v) {
    return ((v.length>1?"0":"")+eval('z.'+v.slice(-1))).slice(-2)
  });
  return y.replace(/(y+)/g,function(v) {return x.getFullYear().toString().slice(-v.length)});
}