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title: volumedownbutton
---
# volumedownbutton
在使用者按下按钮卷时，将触发该事件。
document.addEventListener("volumedownbutton", yourCallbackFunction, false);
## 详细资讯
如果您需要重写预设音量降低的行为你可以注册为事件拦截器 `volumedownbutton` 事件。
应用程式通常应使用 `document.addEventListener` 将一个事件拦截器附加一次 `[deviceready](events.deviceready.html)` 事件火灾。
## 支援的平台
* 黑莓 10
* 安卓系统
## 快速的示例
document.addEventListener("volumedownbutton", onVolumeDownKeyDown, false);
function onVolumeDownKeyDown() {
// Handle the volume down button
}
## 完整的示例
Volume Down Button Example