在我的网站中,有一个下载页面。我想让我的用户在下载页面等待15秒。我想在下载按钮出现之前添加15秒计时器。同时,如果用户在浏览器中单击其他选项卡或最小化浏览器,计时器应停止。
我的问题是如何检测用户在网页上保持观看,这意味着浏览器没有最小化,这个选项卡不是不活动的。如何在javascript
中完成此任务
这里有一个现成的js
(function() {
var hidden, visibilityChange;
if (typeof document.hidden !== "undefined") {
hidden = "hidden";
visibilityChange = "visibilitychange";
} else if (typeof document.mozHidden !== "undefined") {
hidden = "mozHidden";
visibilityChange = "mozvisibilitychange";
} else if (typeof document.msHidden !== "undefined") {
hidden = "msHidden";
visibilityChange = "msvisibilitychange";
} else if (typeof document.webkitHidden !== "undefined") {
hidden = "webkitHidden";
visibilityChange = "webkitvisibilitychange";
}
// If the page is hidden, pause the countdown;
// if the page is shown, resume the countdown
function handleVisibilityChange() {
if (document[hidden]) {
//pause your countdown
} else {
//resume your countdown
}
}
// Warn if the browser doesn't support addEventListener or the Page Visibility API
if (typeof document.addEventListener === "undefined" ||
typeof document[hidden] === "undefined") {} else {
// Handle page visibility change
document.addEventListener(visibilityChange, handleVisibilityChange, false);
}
})();
希望这对你有帮助!:)