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24 lines
694 B
JavaScript
24 lines
694 B
JavaScript
// Copyright (c) 2012 Ecma International. All rights reserved.
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// This code is governed by the BSD license found in the LICENSE file.
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/*---
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es5id: 11.13.2-26-s
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description: >
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Strict Mode - TypeError is thrown if The LeftHandSide of a
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Compound Assignment operator(+=) is a reference to a data property
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with the attribute value {[[Writable]]:false}
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flags: [onlyStrict]
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---*/
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var obj = {};
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Object.defineProperty(obj, "prop", {
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value: 10,
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writable: false,
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enumerable: true,
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configurable: true
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});
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assert.throws(TypeError, function() {
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obj.prop += 20;
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});
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assert.sameValue(obj.prop, 10, 'obj.prop');
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