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已废弃
This feature is obsolete. Although it may still work in some browsers, its use is discouraged since it could be removed at any time. Try to avoid using it.
Summary
Provides a means for an app to check whether it is installed. This function is typically called from an origin that hosts an app.
Syntax
navigator.mozApps.amInstalled( callback )
Parameters
-
callback -
A callback function; it is called with one argument: an
Appobject if the app is installed, ornullif not.