Ajax响应文本始终为1

Question

I am sending two variables to my php page for calculation then echoing the end result back. My response text always equals one.

The Javascript:

var xhttp = new XMLHttpRequest();
 xhttp.open("GET","calc.php?w1="+ftest+"&w2="+ltest,true);
    xhttp.onreadystatechange = function() {
     if(xhttp.readyState==4)   
     {   
         var dog = xhttp.responseText;
         alert(dog); 
     }   
    };
   xhttp.send(null);
  }

The php:

I set the end var to a random number here just to test if my math was causing the problem.

$startdate = $_GET['w1'];
$endDate = $_GET['w2'];
$workingdays = 239;
echo $workingDays;

Answer 1

Set $workingDays directly to 10 ( random number ). If it is not 10, then you are clearly not seeing the result of that echo statement.

1 is often used as the output to native PHP functions such as isset