function getchromeversion() {
    var arr = navigator.useragent.split(' ');
    var chromeversion = '';
    for (var i = 0; i < arr.length; i++) {
        if (/chrome/i.test(arr[i]))
            chromeversion = arr[i]
    }
    if (chromeversion) {
        return number(chromeversion.split('/')[1].split('.')[0]);
    } else {
        return false;
    }
}
(function (jquery) {
    $.fn.scrollclass = function (config) {

        var num = 50;
        var defaults = {};
        var config = jquery.extend(defaults, config);
        var target = this;

        function addaction() {
            var length = target.length;
            for (var i = 0; i < length; i++) {
                if (target.eq(i).hasclass('action')) continue;
                var in_position = target.eq(i).offset().top + 100;
                var window_bottom_position = jquery(window).scrolltop() + jquery(window).height();
                if (in_position < window_bottom_position) {
                    target.eq(i).addclass('action');
                }
            }
        }
        addaction();

        jquery(window).on('scroll', function () {
            addaction();
        });
        return target;
    };
})(jquery);

$(document).ready(function () {
	jquery('.target').delay(300).scrollclass();
});