1. function flatten(args) {
    2.     let result = [];
    3.   const flattens = function(stack, result) {
    4.       for(let j = 1; j < stack.length; j += 1) {
    5.         if (Array.isArray(stack[j])) {
    6.           flattens(stack[j], result);
    7.       } else {
    8.           result.push(stack[j])
    9.       }
    10.     }
    11.   }
    12.   for(let i = 0; i < args.length; i += 1) {
    13.       flattens(args[i], result)
    14.   }
    15.      return result
    16. }

    数组扁平化

    1. function flatten(args) {
    2.     let result = [];
    3.   const flattens = function(stack, result) {
    4.       for(let j = 1; j < stack.length; j += 1) {
    5.         if (Array.isArray(stack[j])) {
    6.           flattens(stack[j], result);
    7.         continue
    8.       } 
    9.       result.push(stack[j])
    10.     }
    11.   }
    12.   for(let i = 0; i < args.length; i += 1) {
    13.     if ( Array.isArray(args[i])) {
    14.       flats(args[i])
    15.     } else {
    16.       result.push(args[i])
    17.     }
    18.   }
    19.      return result
    20. }