visibilitychange事件可以检查从后台返回事件，然后通过添加div，强制浏览器刷新页面

var divEle = document.createElement("DIV");        divEle.style.position = "absolute";        divEle.style.left = "0px";        divEle.style.top = "0px";        divEle.style.width = "100%";        divEle.style.height = "100%";        divEle.style.zIndex = "9999999";        divEle.style.backgroundColor = "#000";                document.addEventListener("visibilitychange", () => {            try {                if (document.hidden) {                    document.body.appendChild(divEle);                }                else {                    document.body.removeChild(divEle);                }            }            catch (e) {            }        });