зеркало из https://github.com/mozilla/pjs.git
0794dcd8d7
Subject:
Re: Rhino: [[DefaultValue]] missing for Call object
Resent-Date:
Mon, 2 Jul 2001 08:52:07 -0700 (PDT)
Resent-From:
mozilla-jseng@mozilla.org
Date:
Mon, 02 Jul 2001 11:49:59 -0400
From:
Norris Boyd <nboyd@atg.com>
Organization:
Art Technology Group
To:
Christopher Oliver <coliver@mminternet.com>
CC:
mozilla-jseng@mozilla.org
References:
1
I believe the correct result of the script should be
[object global]
[object Object]
[object global]
The activation object (which goes by the name of "Call" for historical
reasons) should never be the 'this' value in a function call. See "10.1.6
Activation Object" in the ECMA spec.
I'll look at fixing the problem for Rhino. If there's agreement on my
analysis, someone should fix this for Spidermonkey too.
--N
Christopher Oliver wrote:
> Hi,
>
> function a() {
> function b() {
> print(this);
> }
> this.f = function() {
> print(this);
> b();
> }
> b();
> }
>
> var a = new a();
> a.f();
>
> Running the above script with SpiderMonkey produces:
>
> [object global]
> [object Object]
> [object Call]
>
> Running with Rhino produces the following exception:
>
> uncaught JavaScript exception: undefined: Cannot find default value for
> object. (line 3)
>
> This is due to a bug in org.mozilla.javascript.NativeCall which doesn't
> implement toString or valueOf or override getDefaultValue.
> However, even after I hacked in an implementation of getDefaultValue in
> NativeCall, Rhino still produces a different result then spidermonkey:
>
> [object Call]
> [object Object]
> [object Call]
|
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|---|---|---|
| .. | ||
| docs | ||
| examples | ||
| macbuild | ||
| src | ||
| toolsrc | ||
| Makefile | ||
| README.html | ||
| apiClasses.properties | ||
| build-date | ||
| build.xml | ||
README.html
<html> <!-- - The contents of this file are subject to the Netscape Public - License Version 1.1 (the "License"); you may not use this file - except in compliance with the License. You may obtain a copy of - the License at http://www.mozilla.org/NPL/ - - Software distributed under the License is distributed on an "AS - IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or - implied. See the License for the specific language governing - rights and limitations under the License. - - The Original Code is Rhino code, released - May 6, 1999. - - The Initial Developer of the Original Code is Netscape - Communications Corporation. Portions created by Netscape are - Copyright (C) 1998-1999 Netscape Communications Corporation. All - Rights Reserved. - - Contributor(s): - Norris Boyd - - Alternatively, the contents of this file may be used under the - terms of the GNU Public License (the "GPL"), in which case the - provisions of the GPL are applicable instead of those above. - If you wish to allow use of your version of this file only - under the terms of the GPL and not to allow others to use your - version of this file under the NPL, indicate your decision by - deleting the provisions above and replace them with the notice - and other provisions required by the GPL. If you do not delete - the provisions above, a recipient may use your version of this - file under either the NPL or the GPL. --> <body> <h1> <span CLASS=LXRSHORTDESC> Rhino: JavaScript in Java<p> </span> </h1> <span CLASS=LXRLONGDESC> Rhino is an implementation of JavaScript in Java. Documentation can be found <a href="http://www.mozilla.org/js/rhino/rhino.html">here</a>. </span> </body> </html>