enabled - Web APIs 编辑

Summary

Indicates whether or not Software Installation is enabled for this client machine.

Method of

InstallTrigger object

Syntax

Boolean enabled (); 

Parameters

None

Returns

True if Software Installation is enabled for this client machine; otherwise, false. The method reflects the value of the Software Installation preference in the user interface, and of the xpinstall.enabledpreference in pref.js.

Example

The following code uses the startSoftwareUpdate method to unconditionally trigger a download from http://royalairways/royalpkg.xpi as long as Software Installation is enabled on the browser:

if (InstallTrigger.enabled() ) {
    InstallTrigger.startSoftwareUpdate ("http://royalair.com/rasoft.xpi");
}