SOURCE

function URLParams(search) {
    search = search || location.search
    let result = {}
    if (typeof URLSearchParams === 'function') {
        const searchEntries = new URLSearchParams(search)
        for (const [key, value] of searchEntries) {
            result[key] = value
        }
    } else {
        const paramLists = search.replace('?', '').split('&')
        for (const param of paramLists) {
            const [key, value] = param.split('=')
            result[key] = value
        }
    }
    return result
}
console.log(URLParams('?a=1&d=1'))