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How to call another function?

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Hi all,
    I want to call a function from another funciton in the same js file. 
For example, in hello.js two functions are defined as follow:

// hello.js
function hello() {
	alert("hello");
}

function submit() {
	hello();
	return true;
}

Then, the submit() function is called in hello.html:
<--! hello.html -->
<html>
<head>
     <title>Document</title>
	<script src="hello.js"> </script>
</head>
<body>
	<form onsubmit="submit()">
		<input type="submit" value="submit" />
	</form>
</body>
</html>

But, the message box doesn't pop up as expected. If the onsubmit is 
replaced as
         onsubmit="hello()"
the message box can pop up. It seeems that a function can not call 
another function. Is it correct? How can I deal with the problem? Thanks.

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Thread

How to call another function? parmenides <xparmenides@yahoo.com> - 2017-07-03 14:37 +0800
  Re: How to call another function? Ben Bacarisse <ben.usenet@bsb.me.uk> - 2017-07-03 12:31 +0100
  Re: How to call another function? JJ <jj4public@vfemail.net> - 2017-07-04 10:18 +0700

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