//因為單頁面應用的特殊性，需要手動計算 refurl
var _getRefUrl = function(absUrl, refUrl) {
    var tempAbsUrl = sessionStorage.getItem(‘absUrl’);
    var tempRefUrl = sessionStorage.getItem(‘refUrl’)
    if(tempAbsUrl === null && tempRefUrl === null) { 
        //首次進入系統
        //存入本地存儲
        tempAbsUrl = absUrl;
        sessionStorage.setItem(‘absUrl’, absUrl);
        tempRefUrl = refUrl;
        sessionStorage.setItem(‘refUrl’, refUrl);
    } else if(absUrl !== tempAbsUrl) { 
        //當前頁面不等于緩存的頁面，說明已切換頁面。替換緩存中的refurl
        sessionStorage.setItem(‘refUrl’, tempAbsUrl);
        tempRefUrl = tempAbsUrl;
        sessionStorage.setItem(‘absUrl’, absUrl);
        tempAbsUrl = absUrl;
    }

    return {‘absUrl’: tempAbsUrl, ‘refUrl’: tempRefUrl};
}

調用函數 _getRefUrl(location.absUrl(), window.document.referrer); 注：location.absUrl()是angularjs獲取當前頁面的url方法；