var liststr="a=1,a=2,b=3,b=4";
function getListByIndex(liststr,index)
{
let arr =liststr.toString().split(",");
let arr2 =arr[index].toString().split("=");
return arr2[1]
};
console.log(getListByIndex(liststr,0));
var liststr="a=1,a=2,b=3,b=4";
function getListByIndex(liststr,index)
{
let arr =liststr.toString().split(",");
let arr2 =arr[index].toString().split("=");
return arr2[1]
};
console.log(getListByIndex(liststr,0));