数组的深拷贝
let new_arr = JSON.parse(JSON.stringify(arr))
多维数组改为一维
let arr = res.data.result
for (let i = 0; i < arr.length; i++) {
if (arr[i].children) {
arr = arr.slice(0, i + 1).concat(arr[i].children, arr.slice(i + 1))
delete arr[i].children
}
}
console.log(arr);
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