如何 - 在线离线检测
学习如何使用 JavaScript 检测浏览器是在线还是离线。
离线检测
onLine 属性的 Navigator 对象返回一个布尔值，该值指定浏览器是在线还是离线模式
在我们的 JavaScript Navigator 教程 中了解更多关于 Navigator 对象的信息。
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