取出数组最大值与最小值

int 型数组排序

<!DOCTYPE html>
<html>
    <head>
        <meta charset="utf-8" />
        <title></title>
    </head>
    <body>
        <script type="text/javascript">
            function sortNumber(a,b){return a - b}
            var a = new Array(10,2,8);
            var b = a.sort(sortNumber);
            alert("排序为"+b+"
"+"最大值是"+b[0]+"
"+"最小值是"+b[b.length-1])
            //alert(b.pop()); //最大值                   //alert(b.shift());//最小值
        </script>
    </body>
</html>

字符串排序

<!DOCTYPE html>
<html>
    <head>
        <meta charset="utf-8" />
        <title></title>
    </head>
    <body>
        <script type="text/javascript">
            var a = new Array("a","c" , "b");
            var b = a.sort();
            alert(b)
        </script>
    </body>
</html>

参考：http://www.w3school.com.cn/jsref/jsref_sort.asp