get json key titles and values

<!DOCTYPE html>
<html>
<head>

<style>

    body{
        background-color: #FFFFFF;
        font-family: Arial, Helvetica, sans-serif;
    }

</style>

</head>
<body>

<h2>JsonLoad</h2>

<script>
    var jsonSource = [
        {"title-a":"subject-0", "title-b":"thread-0"},
        {"title-a":"subject-1", "title-b":"thread-1"},
        {"title-a":"subject-2", "title-b":"thread-2"},
    ];

    var keyList = [];
    var valueList = [];

    for (i = 0; i < jsonSource.length; i++) {
        var thisObject = jsonSource[i];
        for(var k in thisObject){
            if(i == 0){
                keyList.push(k) ;  // push key names
            };
            valueList.push(thisObject[k]); // push key values
        }
    }

    console.log("keyList:" + keyList);
    console.log("valueList:" + valueList);

</script>

</body>
</html>