

function formatDate(date) {
 var d = new Date(date),
 month = '' + (d.getMonth() + 1),
 day = '' + d.getDate(),
 year = d.getFullYear();
 
 if (month.length < 2) month = '0' + month;
 if (day.length < 2) day = '0' + day;
 
 return [year, month, day].join('-');
}使用方法:
console.log(formatDate('Sun May 13,2016'));输出:
2016-05-13 2014-05-11
