页面返回刷新或H5监听(手机的)返回键

1.

pushHistory();
window.addEventListener("popstate", function(e) {
    alert("我监听到了浏览器的返回按钮事件啦");//根据自己的需求实现自己的功能
}, false);
function pushHistory() {
    var state = {
        title: "title",
        url: "#"
    };
    window.history.pushState(state, "title", "#");
}

2.

var hiddenProperty = 'hidden' in document ? 'hidden' :
    'webkitHidden' in document ? 'webkitHidden' :
    'mozHidden' in document ? 'mozHidden' :
    null;
var visibilityChangeEvent = hiddenProperty.replace(/hidden/i, 'visibilitychange');
var onVisibilityChange = function(){
    if (!document[hiddenProperty]) {
        console.log('页面非激活');
    }else{
        console.log('页面激活')
    }
}
document.addEventListener(visibilityChangeEvent, onVisibilityChange);

参考: https://developer.mozilla.org/zh-CN/docs/Web/API/Document/hidden