Getting user email from SharePoint List Item column using Javascript

	function sharePointReady() {
	var clientContext = SP.ClientContext.get_current();
	var web = context.get_web();
	var user = web.ensureUser(logonName);
	clientContext.load(user);
	clientContext.executeQueryAsync(onQuerySucceeded, onQueryFailed);
	}
	function onQuerySucceeded() {
	alert('Display Name' + user.get_lookupValue());
	alert('Email ID ' + user.get_email());
	alert('The account name is ' + user.get_loginName());
	}
	function onQueryFailed(sender, args) {
	alert('Error: ' + args.get_message());
	}

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