Quelle test_bug793969.html Sprache: HTML

products/Sources/formale Sprachen/C/Firefox/js/xpconnect/tests/mochitest/test_bug793969.html

<!DOCTYPE HTML>
<html>

<head>
  <meta charset="utf-8">
  <title>Test for Bug 793969</title>
  <script src="/tests/SimpleTest/SimpleTest.js"></script>
  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
</head>
<body>
<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=793969">Mozilla Bug 793969</a>
<p id="display"></p>
<div id="content" style="display: none">

</div>
<pre id="test">
<script type="application/javascript">

/** Test for Bug 793969 **/
function checkThrows(f, desc, skipMessageCheck) {
  try {
    f();
    ok(false, "Should have thrown for " + desc);
  } catch (e) {
    ok(true, "threw correctly");
    if (!skipMessageCheck)
      ok(/denied/.exec(e) ||
         /can't redefine non-configurable property/.exec(e),
         "Correctly threw a security exception: " + e);
  }
}

// NB: These sets will be no-ops (throw in strict mode) because setting an inherited readonly value prop has those semantics.
checkThrows(function() { "use strict"; location.valueOf = 'hah'; }, 'Shadow with string', /* skipMessageCheck = */ true);
checkThrows(function() { "use strict"; location.valueOf = function() { return {a: 'hah'};} }, 'Shadow with function', /* skipMessageCheck = */ true);
checkThrows(function() { Object.defineProperty(location, 'valueOf', { value: function() { return 'hah'; } }); }, 'defineProperty with value');
checkThrows(function() { delete location.valueOf; Object.defineProperty(location, 'valueOf', { value: function() { return 'hah'; } }); }, 'delete + defineProperty with value');
checkThrows(function() { Object.defineProperty(location, 'valueOf', { get: function() { return 'hah'; } }); }, 'defineProperty with getter');
checkThrows(function() { delete location.valueOf; Object.defineProperty(location, 'valueOf', { get: function() { return 'hah'; } }); }, 'delete + defineProperty with getter');

Object.prototype.valueOf = function() { return 'hah'; };
is(({}).valueOf(), 'hah', "Shadowing on Object.prototype works for vanilla objects");
is(location.valueOf(), location, "Shadowing on Object.prototype and Location.prototype doesn't for location objects");

location[Symbol.toPrimitive] = function() { return 'hah'; }
is(location + "", location.toString(), "Should't be able to shadow with toPrimitive");

</script>
</pre>
</body>
</html>

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