I have a piece of JQuery Script that works fine in Chrome and Mozilla, but does not want to work in IE.  I read up on it and it said that IE does not support the include function. So I tried using indexof but that made it stop work in all browsers.  What can I use that will work in all browsers? I appreciate any help rendered.

2. function sendCheck() {
3. var valid;
4. valid = validateCheck();
5. if(valid) {
6. jQuery.ajax({
7. url: "verify_step1.php",
8. data:'age='+$("#aRange").val()+'&fd='+$("#fdate").val()+'&ft='+$("#ftime").val()+'&td='+$("#tdate").val()+'&tt='+$("#ttime").val()+'&pul='+$("#floc option:selected").val()+'&dol='+$("#tloc option:selected").val(),
9. type: "POST",
10. success:function(data){
11. $("#display").html(data);
12. //if (data.indexof("Success") > -1){   // does not work in all browsers.
13.                                 if (data.includes("Success")){    // works in all browsers except IE
14. setTimeout(' window.location.href = "res_step2.php"; ',2000);
15.                               }
16. },
17. error:function (){}
18. });
19. }
20. }