Javascript字符串转换和数组排序

Question

我正在尝试在 JavaScript 学习网站上发起挑战。

说明是:

It was decided to attribute a "weight" to numbers. The weight of a number will be from now on the sum of its digits For example 99 will have "weight" 18, 100 will have "weight" 1 so in the list 100 will come before 99. Given a string with the weights of FFC members in normal order can you give this string ordered by "weights" of these numbers?

Example: a = "56 65 74 100 99 68 86 180 90"ordered by numbers weights becomes: "100 180 90 56 65 74 68 86 99" When two numbers have the same "weight", let us class them as if they were strings and not numbers: 100 is before 180 because its "weight" (1) is less than the one of 180 (9) and 180 is before 90 since, having the same "weight" (9) it comes before as a string. All numbers in the list are positive numbers and the list can be empty.

我的尝试如下:

function orderWeight(strng) {

  console.log(strng);
  if (strng === "") {
    return strng;
  } else {
    var arr = strng.split(" ").sort();
    console.log(arr);
    var keys = [];

    for (var i = 0; i < arr.length; i++) {
      var weight = 0;
      var current = arr[i];
      //loop through the array adding the digits of each number
      for (var j = 0; j < arr[i].length; j++) {
        var sNum = parseInt(arr[i].charAt[j]);
        weight += sNum;
        console.log(weight);
      }
      keys.push({
        weight: weight,
        number: current
      });
      console.log(keys);
    }
  }
};

我的代码的输出是:

input string "103 123 4444 99 2000"
console.log(arr); = [ '103', '123', '2000', '4444', '99' ]
console.log(weight); = NaN

我意识到在我让这部分代码工作后我需要做更多的事情，但如果有人能指出我让这部分做我想做的事情的方向，我将非常感激。

Answer 1

调用 charAt 时，您使用方括号而不是圆括号。

更改此:

var sNum = parseInt(arr[i].charAt[j]);

至:

var sNum = parseInt(arr[i].charAt(j));