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while (items.length && !collectionIterator.afterLast) // 此处会出现 死循环e,此时collectionIterator.beforeFrist = true
//collectionIterator.afterLast = false;
{
....
....
collectionIterator.moveNext(); ///这个函数可能改变两个值:beforeFrist ,afterLast
// in line 6372,, will set collectionIterator.afterLast = false, or
// set collectionIterator.beforeFrist = true;
// but line: 6338 whie( ! afterLast ) ??? why??
}