JS数组扁平化方法总结
| 1 | let ary = [1, [2, [3, [4, 5]]], 6]; | 
常用:
第一种:
| 1 | arr_flat = arr.flat(Infinity); | 
第二种:扩展运算符
| 1 | while (ary.some(Array.isArray)) { | 
第三种:
| 1 | ary = str.replace(/(\[\]))/g, '').split(','); | 

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