Lucas

我的理解是，举个例子：观察者模式相等于A在文章写好之后直接发送给B和C进行查看，也就是说A与B、C直接强关联， 而发布订阅模式 相当于 A在写好文章后，发布到第三方文章发布平台，而订阅了A文章的B和C会收到平台得推送，进而查看文章， 也就是说A与B、C直接属于间接弱关联。

```js const normalize = function(str) { let res = {} str.split(/[\[\]]/).filter(Boolean).reduce((prev, curr, index) => { if (index) prev = prev['children'] = {} prev['value'] = curr; return prev }, res) return...

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