1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
|
// Copyright (c) 2012 Ecma International. All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.
/*---
info: |
Step 4 of defineProperty calls the [[DefineOwnProperty]] internal method
of O to define the property. For non-configurable properties, step 11.a.ii
of [[DefineOwnProperty]] permits setting a getter if absent.
es5id: 15.2.3.6-4-21
description: >
Object.defineProperty permits setting a getter (if absent) of
non-configurable accessor properties(8.12.9 step 11.a.ii)
---*/
var o = {};
// create an accessor property; all other attributes default to false.
// dummy setter
var setter = function(x) {}
var d1 = {
set: setter
};
Object.defineProperty(o, "foo", d1);
// now, trying to set the getter should succeed even though [[Configurable]]
// on the original property will be false. Existing values of need to be preserved.
var getter = undefined;
var desc = {
get: getter
};
Object.defineProperty(o, "foo", desc);
var d2 = Object.getOwnPropertyDescriptor(o, "foo");
assert.sameValue(d2.get, getter, 'd2.get');
assert.sameValue(d2.set, setter, 'd2.set');
assert.sameValue(d2.configurable, false, 'd2.configurable');
assert.sameValue(d2.enumerable, false, 'd2.enumerable');
reportCompare(0, 0);
|
