javascript - XMLHttpRequest to .js file -

i trying experiment codes. send xmlhttprequest javascript file have document.write('hello world'); , use code in head section of html document:

<script>         function loadxmldoc() {         var xmlhttp;         if (window.xmlhttprequest) {             xmlhttp = new xmlhttprequest();         } else {             xmlhttp = new activexobject("microsoft.xmlhttp");         }         xmlhttp.onreadystatechange = function() {             if (xmlhttp.readystate == 4 && xmlhttp.status == 200) {                 document.getelementbyid("mydiv").innerhtml = xmlhttp.responsetext;             }         }         xmlhttp.open("get", "java.js", true);         xmlhttp.send();     } </script> 

and in java.js there single line of code

document.write('hello world'); 

what expect result should 'hello world' prints whole line document.write('hello world');. there way 'hello world' responsetext? using files. know can done using php/asp or text file challenge college days before 2 years when student using javascript file , still don't have dear how this. want know excellent brains of world on stack overflow.

the way evaling response , know side-effects of using eval.

replace xmlhttp.responsetext eval(xmlhttp.responsetext) , should work.

note: use caution while evaling!

just sure not send markup <script> in response eval not have desired effect then.