split分割字符串返回字符串数组

<script type="text/javascript">
	var str='liu jin yu';
	var str1=str.split(' ');
	document.write(str1+'</br>');

	document.write(str1[1]+'</br>');	

	var str2=str.split(' ',1);
	document.write(str2+"</br>")
</script>