Heart note distal --------- a = b & c = d

var string_a = 'a=b&c=d';
    var string = string_a.split('&');
    var res = {};
    console.log(string)
    for(var i = 0;i<string.length;i++){
    var str = string[i].split('=');
    console.log(str)
    res[str[0]]=str[1];
}
document.write(JSON.stringify(res));

Input a = b & c = d, json output format.