// 3. Width of resizing browser window
The choice is yours.。业内人士推荐新收录的资料作为进阶阅读
，这一点在PDF资料中也有详细论述
But I'll keep updating my own list. I see in the code where the interaction policy is declared, but not where individual quotes are authorized. If I quote this post here, let's test if both of us will see the quote.
return foldForest(fn(accumulator, tree.value), tree.forest, fn);，详情可参考新收录的资料