String.prototype.split()兼容问题

"a:b:c".split(/(:)/)

Firefox输出：
["a",":","b",":","c"]

var rgb2Array = function () {
    var test = (" a b c ").split(/s/),
    isWrong = test.length === 3;
   
    return isWrong ? function (str) {
        return str.split(/D+/);
    } : function (str) {
        var ret = str.split(/D+/);
        ret.shift();
        ret.pop();
        return ret;
    };
}();