JavaScript: var functionName = function() {} vs function functionName() {}

	//The difference is that functionTwo is defined at parse-time for a script block, whereas functionOne is defined at run-time. For example:
	<script>
	// Error
	functionOne();
	var functionOne = function() {
	}
	</script>
	<script>
	// No error
	functionTwo();
	function functionTwo() {
	}
	</script>

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http://stackoverflow.com/questions/336859/javascript-var-functionname-function-vs-function-functionname