更新
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'use strict';
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var classof = require('../internals/classof-raw');
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var wellKnownSymbol = require('../internals/well-known-symbol');
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var ITERATOR = wellKnownSymbol('iterator');
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module.exports = function (it) {
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return it[ITERATOR] !== undefined
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|| it['@@iterator'] !== undefined
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|| classof(it) === 'Arguments';
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};
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