A different approach, works in situ.
function flatten(array) {
var l = array.length, temp;
while (l--) {
if (Array.isArray(array[l])) {
flatten(array[l]);
temp = array[l].slice();
temp.unshift(1);
temp.unshift(l);
[].splice.apply(array, temp);
}
}
}
var array = [['1', '2', '3'], ['4', '5', ['6'], ['7', '8']]];
flatten(array);
console.log(array);
与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…