mozilla

Components

Components 对象是 XPConnect 功能被映射到 JavaScript 上的对象。Components 对象的 native 实现位置在   nsIXPCComponents , 这个接口会被映射成JavaScript 作为使用 XPConnect 的最高层级的对象。

Components 的一些属性需要高级的全写,可能在 web 页面中不能正常工作。

 Components 对象包含下面的成员:

classes
array of classes by ContractID
classesByID
array of classes by CID
Constructor
constructor for constructor of components
Exception
constructor for XPConnect exceptions
ID
constructor for XPCOM nsIDs
interfaces
array of interfaces by interface name
interfacesByID
array of interfaces by IID
isSuccessCode
function to determine if a given result code is a success code
lastResult
result code of most recent XPConnect call
manager
the global XPCOM component manager
results
array of known result codes by name
returnCode
pending result for current call
stack
current JavaScript call stack
utils
provides access to several useful features
 
utils.atline
Provides access to the value of the atline property in the JavaScript environment.
utils.createObjectIn
Creates a new object in the scope of the specified object's compartment. May only be called from JavaScript code.
utils.evalInSandbox
Runs JavaScript code in a sandbox, usually used to run code with restricted privileges.
utils.forceGC
Forces a garbage collection cycle.
utils.getGlobalForObject 
Returns the global object with which a given object is associated (through its prototype chain at birth, for example).
utils.getWeakReference 
Gets a weak reference for the object passed in.
utils.import 
Loads a JavaScript module into the current script, without sharing a scope.
utils.lookupMethod
Looks up a native (i.e. declared in the interface) method or property of an XPCOM object. Serves the same purpose as XPCNativeWrapper.
utils.makeObjectPropsNormal
Ensures that all functions come from the specified object's scope, and aren't cross-compartment wrappers. May only be called from JavaScript code.
utils.methodjit 已废弃 Gecko 24.0
Provides access to the value of the methodjit property in the JavaScript environment.
utils.methodjit_always 已废弃 Gecko 24.0
Provides access to the value of the methodjit_always property in the JavaScript environment.
utils.relimit
Provides access to the value of the relimit property in the JavaScript environment.
utils.reportError
Reports a JavaScript Error object to the Error Console.
utils.schedulePreciseGC
Requests that garbage collection occur sometime in the future when no JavaScript code is running; accepts a callback function to receive notification once collection is complete.
utils.setGCZeal()
Sets the GC zeal level for the context.
utils.strict
Provides access to the value of the strict property in the JavaScript environment.
utils.werror
Provides access to the value of the werror property in the JavaScript environment.
utils.Sandbox
Creates sandbox objects for use with evalInSandbox.
utils.xml
Provides access to the value of the xml property in the JavaScript environment.

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