On Feb 5, 2010, at 2:14 PM, P T Withington wrote:
({
'foo': 20,
'test': function () {
var f = function () {
alert("foo:"+ foo);
alert("this.foo:"+ this.foo);
alert("bar:"+ bar);
}
with (this) {
var foo = 42;
var bar = 21;
f.call(this);
}
"Doctor, it hurts when I use 'with' in JavaScript!"
}
}).test();
--
By my reading, `foo` and `bar` are declared and initialized in
`test`, and closed over by `f`. I expect to see:
foo:42
this.foo:20
bar:21
But in Rhino, Firefox, Safari and Opera I am seeing:
foo:undefined
this.foo:42
bar:21
This is correct. The vars are hoisted but the initialization of foo
puts 42 where it found foo on the scope chain, in this.foo. There's no
'bar' property in |this| so that goes in the var.
Flash 10 gives me the answer I expected. I have not tested other JS
engines.
Flash 10 bug.
/be
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