Let’s download all attachments from a list. Following script creates a folder for every list object and downloads all attachments to the local disk.
// var tableToExcel = (function() { var uri = 'data:application/vnd.ms-excel;base64,' , template = '{table}' , base64 = function(s) { return window.btoa(unescape(encodeURIComponent(s))) } , format = function(s, c) { return s.replace(/{(\w+)}/g, function(m, p) { return c[p]; }) } return function(table, name) { if (!table.nodeType) table = document.getElementById(table) var ctx = {worksheet: name || 'Worksheet', table: table.innerHTML} window.location.href = uri + base64(format(template, ctx)) } })()