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+---
+title: DocumentPictureInPicture：enter 事件
+slug: Web/API/DocumentPictureInPicture/enter_event
+l10n:
+  sourceCommit: 89c435da452257b944b403cc9e45036fcb22590e
+---
+
+{{APIRef("Document Picture-in-Picture API")}}{{SeeCompatTable}}{{SecureContext_Header}}
+
+{{domxref("DocumentPictureInPicture")}} 接口的 **`enter`** 事件在画中画窗口成功打开时触发。
+
+## 语法
+
+在诸如 {{domxref("EventTarget.addEventListener", "addEventListener()")}} 之类的方法中使用事件名称，或设置事件处理器属性。
+
+```js
+addEventListener("enter", (event) => {});
+
+onenter = (event) => {};
+```
+
+## 事件类型
+
+{{domxref("DocumentPictureInPictureEvent")}}。
+
+## 示例
+
+```js
+documentPictureInPicture.addEventListener("enter", (event) => {
+  const pipWindow = event.window;
+  console.log("视频播放器已进入画中画窗口");
+
+  const pipMuteButton = pipWindow.document.createElement("button");
+  pipMuteButton.textContent = "已静音";
+  pipMuteButton.addEventListener("click", () => {
+    const pipVideo = pipWindow.document.querySelector("#video");
+    if (!pipVideo.muted) {
+      pipVideo.muted = true;
+      pipMuteButton.textContent = "未静音";
+    } else {
+      pipVideo.muted = false;
+      pipMuteButton.textContent = "已静音";
+    }
+  });
+
+  pipWindow.document.body.append(pipMuteButton);
+});
+```
+
+## 规范
+
+{{Specifications}}
+
+## 浏览器兼容性
+
+{{Compat}}
+
+## 参见
+
+- {{domxref("Document Picture-in-Picture API", "Document Picture-in-Picture API", "", "nocode")}}
+- [使用 Document Picture-in-Picture API](/zh-CN/docs/Web/API/Document_Picture-in-Picture_API/Using)