javascript 日期格式化

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('-');}