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script.js is:
xmlhttp = new XMLHttpRequest();
document.getElementById("test").innerHTML=xmlhttp.responseText;
xmlhttp.open("GET","script.js");
xmlhttp.send();
alert(1);


Test page is:
<html>
<body>
<script id="test" src="script.js"></script>
</body>
</html>

For example, if I changed script.js to alert(1); it should alert 1, and then if I changed it to document.write("hello"); it should write hello to the page without them refreshing.