let str = "t=дата&s=сумма"; let obj = str.split("&").reduce((ob, v) => ([a,b]=v.split("="),ob[a]=b,ob), {}); console.log(obj)
const str = "t=дата&s=сумма"; const obj = new URLSearchParams(str); console.table([...obj]);
<script crossorigin="anonymous" src="https://polyfill.io/v3/polyfill.min.js?features=URL"></script>
var str = "t=дата&s=сумма"; var obj = str.split("&").reduce(function(ob, v) { v = v.split("="); ob[v[0]] = v[1]; return ob }, {} ); console.log(obj)