页面隐藏再出现后调用方法

// 页面隐藏出来后执行方法
var htmlBridgeReloadData = function(){
    main.getWorkType()
}
    function getHiddenProp() {
        var prefixes = ['webkit', 'moz', 'ms', 'o'];

        if ('hidden' in document) return 'hidden';

        for (var i = 0; i < prefixes.length; i++) {
            if ((prefixes[i] + 'Hidden') in document)
                return prefixes[i] + 'Hidden';
        }


        return null;
    }
    function getVisibilityState() {
        var prefixes = ['webkit', 'moz', 'ms', 'o'];
        if ('visibilityState' in document) return 'visibilityState';
        for (var i = 0; i < prefixes.length; i++) {
            if ((prefixes[i] + 'VisibilityState') in document)
                return prefixes[i] + 'VisibilityState';
        }

        return null;
    }

    function isHidden() {
        var prop = getHiddenProp();
        if (!prop) return false;

        return document[prop];
    }

    var visProp = getHiddenProp();
    if (visProp) {
        var evtname = visProp.replace(/[H|h]idden/, '') + 'visibilitychange';
        document.addEventListener(evtname, function () {
            htmlBridgeReloadData();
        }, false);
    }