求解，手机微信页面能否检测后退页面或者在任务管理器关闭微信程序了

Answer 1

        function getPage() {
            var hidden, state, visibilityChange;
            if (typeof document.hidden !== "undefined") {
                hidden = "hidden";
                visibilityChange = "visibilitychange";
                state = "visibilityState";
            } else if (typeof document.mozHidden !== "undefined") {
                hidden = "mozHidden";
                visibilityChange = "mozvisibilitychange";
                state = "mozVisibilityState";
            } else if (typeof document.msHidden !== "undefined") {
                hidden = "msHidden";
                visibilityChange = "msvisibilitychange";
                state = "msVisibilityState";
            } else if (typeof document.webkitHidden !== "undefined") {
                hidden = "webkitHidden";
                visibilityChange = "webkitvisibilitychange";
                state = "webkitVisibilityState";
            }
            return {
                'hidden': hidden,
                'visibilityChange': visibilityChange,
                'state': state
            };
        }
        var Page= getPage();
        document.addEventListener(Page['visibilityChange'], function() {
                if(document[Page['state']] == 'hidden') {
                   //关闭
                } else {
                   //未关闭
                }
        }, false);

Answer 2

回退和关闭时两个需求，都可以监听。

后退：

window.addEventListener("popstate",function(){
    //dosthing...       
});

退出：

 document.addEventListener(Page['visibilityChange'], function() {
        if(document[Page['state']] == 'hidden') {
           //关闭
        } else {
           //未关闭
        }
}, false);