nordon-wang
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nordon-wang
不是area为空，而是city为空
``` var arr1 = [1,2,3,[1,2,3,4, [2,3,4]]]; function flattenDeep(arr1) { return arr1.reduce((acc, val) => Array.isArray(val) ? acc.concat(flattenDeep(val)) : acc.concat(val), []); } flattenDeep(arr1); ```
[参考](https://juejin.im/post/5d372851f265da1ba915bf78)