50 lines
1.7 KiB
JavaScript
50 lines
1.7 KiB
JavaScript
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var anObject = require('../internals/an-object');
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var defineProperties = require('../internals/object-define-properties');
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var enumBugKeys = require('../internals/enum-bug-keys');
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var hiddenKeys = require('../internals/hidden-keys');
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var html = require('../internals/html');
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var documentCreateElement = require('../internals/document-create-element');
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var sharedKey = require('../internals/shared-key');
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var IE_PROTO = sharedKey('IE_PROTO');
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var PROTOTYPE = 'prototype';
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var Empty = function () { /* empty */ };
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// Create object with fake `null` prototype: use iframe Object with cleared prototype
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var createDict = function () {
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// Thrash, waste and sodomy: IE GC bug
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var iframe = documentCreateElement('iframe');
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var length = enumBugKeys.length;
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var lt = '<';
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var script = 'script';
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var gt = '>';
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var js = 'java' + script + ':';
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var iframeDocument;
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iframe.style.display = 'none';
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html.appendChild(iframe);
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iframe.src = String(js);
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iframeDocument = iframe.contentWindow.document;
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iframeDocument.open();
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iframeDocument.write(lt + script + gt + 'document.F=Object' + lt + '/' + script + gt);
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iframeDocument.close();
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createDict = iframeDocument.F;
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while (length--) delete createDict[PROTOTYPE][enumBugKeys[length]];
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return createDict();
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};
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// `Object.create` method
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// https://tc39.github.io/ecma262/#sec-object.create
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module.exports = Object.create || function create(O, Properties) {
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var result;
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if (O !== null) {
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Empty[PROTOTYPE] = anObject(O);
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result = new Empty();
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Empty[PROTOTYPE] = null;
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// add "__proto__" for Object.getPrototypeOf polyfill
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result[IE_PROTO] = O;
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} else result = createDict();
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return Properties === undefined ? result : defineProperties(result, Properties);
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};
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hiddenKeys[IE_PROTO] = true;
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