Is it possible to completely replace a function in JavaScript?
I have come across this code snippet that supposedly replaces a function, but for some reason, the code is not functioning as expected. The DOM seems to update, though. Can anyone shed some light on what might be happening here?
<html>
<head>
<script id="myScript" type="text/javascript">
function someFunction() {
alert("Same old.");
}
</script>
</head>
<body>
<input type="button" onclick="someFunction();" value="A button." />
<script>
function replace() {
var oldFunctionString = someFunction.toString();
var oldContents = oldFunctionString.substring(oldFunctionString.indexOf("{") + 1, oldFunctionString.lastIndexOf("}") );
var newCode = "alert(New code!);";
var newFunctionString = "function someFunction(){"+newCode+"}";
var scriptTag = document.getElementById('myScript');
scriptTag.innerHTML = scriptTag.innerHTML.replace(oldFunctionString,newFunctionString);
}
replace();
</script>
</body>
</html>
JSfiddle here