Notification：permission 静态属性
注意：此功能在 Web Workers 中可用。
Notification 接口中只读的 permission 静态属性指示当前用户为当前源授予的用于显示 Web 通知的状态。
值
一个表示当前权限的字符串。该值可以是：
示例
如果您想在发送通知之前，先检查是否支持通知，然后检查当前源是否已授予发送通知的权限，如果需要则请求权限，可以使用以下代码片段。
js
function notifyMe() {
if (!("Notification" in window)) {
// Check if the browser supports notifications
alert("This browser does not support desktop notification");
} else if (Notification.permission === "granted") {
// Check whether notification permissions have already been granted;
// if so, create a notification
const notification = new Notification("Hi there!");
// …
} else if (Notification.permission !== "denied") {
// We need to ask the user for permission
Notification.requestPermission().then((permission) => {
// If the user accepts, let's create a notification
if (permission === "granted") {
const notification = new Notification("Hi there!");
// …
}
});
}
// At last, if the user has denied notifications, and you
// want to be respectful there is no need to bother them anymore.
}
规范
| 规范 |
|---|
| Notifications API # dom-notification-permission |
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