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This feature is not Baseline because it does not work in some of the most widely-used browsers.
Window 对象的 onappinstalled 属性用于处理 appinstalled 事件，该事件是一个实现了 Event接口的简单事件，会在网页应用成功安装为渐进式网页应用时立即触发。
Window
onappinstalled
appinstalled
Event
window.onappinstalled = function(event) { ... };
window.onappinstalled = function (ev) { console.log("The application was installed."); };
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