指定一个事件监听器来接受 deviceproximity 事件，当设备传感器检测到一个对象越来越接近或远离设备时这些事件就会出现。
语法
window.onuserproximity = funcRef
其中funcRef是在发生 deviceproximity 事件时要调用的函数。这些事件的类型为DeviceProximityEvent。
规范
| Specification | Status | Comment |
|---|---|---|
| Proximity Sensor Proximity Events |
Working Draft | Initial specification |
浏览器兼容性
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| Feature | Chrome | Firefox (Gecko) | Internet Explorer | Opera | Safari |
|---|---|---|---|---|---|
| Basic support | 未实现 | (Yes) | 未实现 | 未实现 | 未实现 |
| Feature | Android | Chrome for Android | Firefox Mobile (Gecko) | IE Mobile | Opera Mobile | Safari Mobile |
|---|---|---|---|---|---|---|
| Basic support | 未实现 | 未实现 | 15.0 (15.0) | 未实现 | 未实现 | 未实现 |