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title: backbutton
---
# backbutton
在使用者按后退按钮时，将触发该事件。
document.addEventListener("backbutton", yourCallbackFunction, false);
## 详细资讯
要重写后退按钮的预设行为，注册为事件拦截器 `backbutton` 事件，通常通过调用 `document.addEventListener` 一旦您收到 `[deviceready](events.deviceready.html)` 事件。 不再需要调用任何其他方法重写的后退按钮的行为。
## 支援的平台
* 亚马逊火 OS
* Android 系统
* 黑莓 10
* Windows Phone 8
## 快速的示例
document.addEventListener("backbutton", onBackKeyDown, false);
function onBackKeyDown() {
// Handle the back button
}
## 完整的示例
Back Button Example