vue hello world项目
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var classof = require('../internals/classof');
var getMethod = require('../internals/get-method');
var Iterators = require('../internals/iterators');
var wellKnownSymbol = require('../internals/well-known-symbol');
var ITERATOR = wellKnownSymbol('iterator');
module.exports = function (it) {
if (it != undefined) return getMethod(it, ITERATOR)
|| getMethod(it, '@@iterator')
|| Iterators[classof(it)];
};