15.2.3.6-4-19.js (1228B)
1 // Copyright (c) 2012 Ecma International. All rights reserved. 2 // This code is governed by the BSD license found in the LICENSE file. 3 4 /*--- 5 info: | 6 Step 4 of defineProperty calls the [[DefineOwnProperty]] internal method 7 of O to define the property. For non-configurable properties, step 11.a.i 8 of [[DefineOwnProperty]] permits setting a setter (if absent). 9 es5id: 15.2.3.6-4-19 10 description: > 11 Object.defineProperty permits setting a setter (if absent) of 12 non-configurable accessor properties(8.12.9 step 10.a.ii.1) 13 ---*/ 14 15 var o = {}; 16 17 // create an accessor property; all other attributes default to false. 18 // dummy getter 19 var getter = function() { 20 return 1; 21 } 22 var d1 = { 23 get: getter 24 }; 25 Object.defineProperty(o, "foo", d1); 26 27 // now, trying to set the setter should succeed even though [[Configurable]] 28 // on the original property will be false. 29 var desc = { 30 set: undefined 31 }; 32 Object.defineProperty(o, "foo", desc); 33 34 var d2 = Object.getOwnPropertyDescriptor(o, "foo"); 35 36 assert.sameValue(d2.get, getter, 'd2.get'); 37 assert.sameValue(d2.set, undefined, 'd2.set'); 38 assert.sameValue(d2.configurable, false, 'd2.configurable'); 39 assert.sameValue(d2.enumerable, false, 'd2.enumerable'); 40 41 reportCompare(0, 0);