js是不是包含空格验证

<form>
	<input type="text" name="test" id="test">
	<input type="submit" onclick="checkSpace('test')">
</form>
<script language="javascript">
	function checkSpace(str)
	{
		var value = document.getElementById(str).value;
		var partn = /^[\S]*$/;
		if(!partn.exec(value))
		{
			alert("true");
		}
		else{
			alert("false");
		}
		return false;
	}
</script>