HTML onoffline 属性
定义和用法
当浏览器开始离线工作时，onoffline 属性会触发。
提示：onoffline 属性与 ononline 属性相反。
适用于
onoffline 属性是 事件属性 的一部分，可以在以下元素上使用
| 元素 | 事件 |
|---|---|
| <body> | onoffline |
浏览器支持
表中的数字指定完全支持事件属性的第一个浏览器版本。
| 事件属性 | |||||
|---|---|---|---|---|---|
| onoffline | 不支持 | 在 IE11 中已弃用 8.0 |
3.0 | 不支持 | 不支持 |
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