function Last7Days () {
var result = [];
for (var i=0; i<7; i++) {
var d = new Date();
d.setDate(d.getDate() - i);
result.push( formatDate(d) )
}
return(result.join(','));
}
Or another solution for the whole thing
function Last7Days () {
return '0123456'.split('').map(function(n) {
var d = new Date();
d.setDate(d.getDate() - n);
return (function(day, month, year) {
return [day<10 ? '0'+day : day, month<10 ? '0'+month : month, year].join('/');
})(d.getDate(), d.getMonth(), d.getFullYear());
}).join(',');
}