While doesn't work

function Sort(td)
{
    var t=document.getElementById("theList");
    var rows=t.getElementsByTagName("td");
    var cells=t.cells;
    var bb=true;
    while(bb==true)
    {
    alert(bb);
      for(var i=1;i<rows.length;i++)
       {
           if(cells[td.cellIndex+i*4].innerText<开发者_Python百科;cells[td.cellIndex+(i+1)*4].innerText)
            {

            }
        }
    alert("Works"); //this alert is not reached
    }
}

The second alert will not be shown. Can you tell me why?

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Your var rows is an array, which will not have a property "cells". That could be your problem right there.

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If something goes wrong in any of the code in the for loop it won't reach the second alert. I'd suggest running this in a JS debugger.