Is it possible to fetch the string that its value changes every 5 seconds by javascript partial refresh

[megalomania]

Hello, everyone. I have a question.

I have web viewer object named "web". If I start a script running, Every 5 seconds, it fetches the string from the HTML that is shown in the web viewer, and keeps creating new records.

Just like this 

GetLayoutObjectAttribute ( "web" ; "content" )

Then the target value always get refreshed every 5 seconds.

javascript is just like this

        function updateLastvalue(new_last_value){
            var current_last_value = $('.last-value').text();
            var fixed_last_value = Number(new_last_value).toFixed(8);
            $('.last-value').text(fixed_last_value);
         
            // update
            document.title = fixed_last_value";
        }

and the number that I want to fetch but it changes every 5 seconds is just like this

 <td><span class="last-value”>297</a></td>

How can I take out this 297 and another numbers that continues changing?

GetLayoutObjectAttribute ( "web" ; "content" ) takes out only the number that was shown first. 

Can anyone help me with this?

Edited January 21, 2018 by megalomania