Scope = VO + All Parent VOs
scopeChain = [[VO] + [VO1] + [VO2] + [VO nomenclature 1]];
what"s the difference between a collection of all variable objects?
Scope = VO + All Parent VOs
scopeChain = [[VO] + [VO1] + [VO2] + [VO nomenclature 1]];
what"s the difference between a collection of all variable objects?
after entering the context and creating the AO/VO, the Scope attribute of the context = AO | VO + function [[scope]]
Scope three() Scope Chain = [ [three() VO] + [two() VO] + [one() VO] + [Global VO] ];
Scope = [AO].concat([[Scope]]); <---
var x = 10;
function foo () {
var y = 20;
function bar () {
var z = 30;
alert(x + y + z);}
bar ();
}
foo (); / / 60
Global context
global_Context.VO===global={
x=10
foo:
}
foo function creation
foo.[[scope]]={
global_context.VO
}
foo function activation (when entering context)
foo_context.AO={
y:20
bar:
}
scope chain of foo function context
foo_context.scope=foo_context.AO+foo.[[scope]]
foo_context.scope=[
foo_context.AO,
global_context.VO
]
bar function creation
bar.[[Scope]] = [
fooContext.AO,
globalContext.VO
];
bar Activation
barContext.AO = {
z: 30
};
scope chain of bar function context
barContext.Scope = barContext.AO + bar.[[Scope]] // i.e.:
barContext.Scope = [
barContext.AO,
fooContext.AO,
globalContext.VO
];
the following is the query process for x y z identifiers:
"x"
barContext.AO // not found
fooContext.AO // not found
globalContext.VO // found - 10"y"
barContext.AO // not found
fooContext.AO // found - 20"z"
barContext.AO // found - 30
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