5-4-1.html

<!DOCTYPE html>
<script>
var MYAPP = MYAPP || {};
MYAPP.namespace = function(ns_string) {
    var parts = ns_string.split('.'),
        parent = MYAPP,
        i;
    if (parts[0] === 'MYAPP') {
        parts = parts.slice(1);
    }
    for (i = 0; i < parts.length; i++) {
        if (typeof parent[parts[i]] === 'undefined') {
            parent[parts[i]] = {};
        }
        parent = parent[parts[i]];
    }
    return parent;
};
MYAPP.namespace('MYAPP.utils.array');

MYAPP.utils.array = (function() {
    var uobj = MYAPP.utils.object,
        ulang = MYAPP.utils.lang,
        array_string = '[object Array]',
        ops = Object.prototype.toString,
        inArray = function(needle, haystack) {
            for (var i = 0, len = haystack.length; i < len; i += 1) {
                if (haystack[i] === needle) {
                    return true;
                }
            }
        },
        isArray = function(a) {
            return ops.call(a) === array_string;
        };
    return {
        isArray: isArray,
        indexOf: inArray
    };
}());

alert(MYAPP.utils.array.isArray([1, 2]));
</script>