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                1. while循環配合concat,展開語法 ```js function flat(arr, num = Infinity) { let i = 0; // 層級 let res = arr // 判斷是否存在子數組 let flag = true while(flag) { flag = res.some(item => Array.isArray(item)) console.log(flag); res = [].concat(...res) // 核心語法,利用...與concat構建一個展開的數組 i++ if (i >= num) { break } } return res } ``` 2.reduce遞歸配合展開語法 ```js function flat2(arr) { return arr.reduce((pre, cur) => { if (Array.isArray(cur)) { // 如果是數組,則拼接新數組時調用flat2,處理內部 return [...pre, ...flat2(cur)] } else { // 如果不是數組,則展開拼接成一個新數組 return [...pre, cur] } }, []) } ```
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