Google Chrome: 10.0.648.119 (Official Build 75907) beta
V8: 3.0.12.24
I have a problem where some identical calls to a function create
different results, but the function makes no changes to the
environment that should persist between calls or affect their results.
Shouldn't the results be the same? I use an ECMAScript file 'test.es'
and an XHTML file to load it (included at the end).
Steps to produce this result:
Load 'test.es' in Google Chrome.
Open the JavaScript Console.
Enter 'submit(client)' and read output 'fresh true'.
Enter 'submit(client)' again and read output 'fresh false'.
Observations:
An anonymous closure the 'submit' function defines appears to retain
the value variable 'fresh' binds to from a previous call. However,
'submit' sets 'fresh' and creates a new closure on each call.
Moreover, both outputs read 'fresh true' when I replace 'client' with
'client0', so the behavior depends on some factor.
Questions:
Shouldn't the results for the identical calls be identical?
Why are the results identical for calls to 'client0' and not 'client'?
Is this a bug?
test.es:
function submit(client) {
var fresh = true, uri = '';
client.fetch(uri,
function () {
console.debug('fresh', fresh),
fresh = false,
delete this.onreadystatechange;
});
}
var client = new XMLHttpRequest, client0 = {fetch : function (uri,
continuation) {var self = this;
setTimeout(function () {continuation.call(self);}, 0);}};
if (!client.DONE)
XMLHttpRequest.prototype.DONE = 4;
client.fetch = function (uri, continuation) {
/* sets this to request resource at uri and dispatch continuation
on acquisition
a continuation error forces continued request until
continuation succeeds or a fatal error occurs */
this.onreadystatechange = function (event) {
if (this.readyState == this.DONE) {
try {continuation.call(this, event);}
catch (error) {
if (error.fail)
this.requestURI(uri);
else
debugger;
}
}
},
this.requestURI(uri);
},
client.requestURI = function(uri) {
this.open('GET', uri),
this.send();
};
The XHTML file:
<html xmlns='http://www.w3.org/1999/xhtml'>
<head>
<meta http-equiv='Content-Script-Type' content='application/
ecmascript' />
<script src='test.es' type='application/ecmascript' />
</head>
<body />
</html>
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