JavaScript数组系列函数之slice函数用法

以下为引用的内容：
<script type="text/javascript">
var arr = new Array("HTML","CSS","JavaScript","DOM","PHP","MySQL");

var new_arr = arr.slice(0,3);
document.write(new_arr);
//输出: HTML,CSS,JavaScript

document.write("<br>");

var new_arr_2 = arr.slice(2);
document.write(new_arr_2);
//输出: JavaScript,DOM,PHP,MySQL

document.write("<br>");

var new_arr_3 = arr.slice(0);
document.write(new_arr_3);
//输出: HTML,CSS,JavaScript,DOM,PHP,MySQL

</script>