vue hello world项目
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// https://github.com/tc39/proposal-iterator-helpers
var $ = require('../internals/export');
var apply = require('../internals/function-apply');
var anObject = require('../internals/an-object');
var toObject = require('../internals/to-object');
var isPrototypeOf = require('../internals/object-is-prototype-of');
var IteratorPrototype = require('../internals/iterators-core').IteratorPrototype;
var createIteratorProxy = require('../internals/iterator-create-proxy');
var getIterator = require('../internals/get-iterator');
var getIteratorMethod = require('../internals/get-iterator-method');
var IteratorProxy = createIteratorProxy(function (args) {
var result = anObject(apply(this.next, this.iterator, args));
var done = this.done = !!result.done;
if (!done) return result.value;
}, true);
$({ target: 'Iterator', stat: true, forced: true }, {
from: function from(O) {
var object = toObject(O);
var usingIterator = getIteratorMethod(object);
var iterator;
if (usingIterator) {
iterator = getIterator(object, usingIterator);
if (isPrototypeOf(IteratorPrototype, iterator)) return iterator;
} else {
iterator = object;
} return new IteratorProxy({ iterator: iterator });
}
});