Question

我正在尝试在两个偶数之间插入破折号（-）。问题是破折号不在两个偶数之间，而是在数字的末尾。

这是代码

function insertHyphen(str) {
  var strArr = str.split('');
  var numArr = strArr.map(Number);
  for(var i = 0; i < numArr.length; i++) {
   if(numArr[i-1]%2===0 && numArr[i]%2===0) {
        numArr.push('-');
    }
  }
  return numArr.join('');
}
insertHyphen('112233445566'); // 112233445566---

Answer 1

使用splice()代替push()。在这里Splice MDN

function insertHyphen(str) {
  var strArr = str.split('');
  var numArr = strArr.map(Number);
    for(var i = 0; i < numArr.length; i++) {
      if(numArr[i-1]%2===0 && numArr[i]%2===0) {
        numArr.splice(i, 0, '-');
      }
    }
  return numArr.join('');
}
console.log(insertHyphen('112233445566')); // 112-2334-4556-6

Answer 2

使用正则表达式：

Private Sub MaskedTextBox_Enter(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles OrgNameTextBox.Enter, OrgNameTextBox.Leave        
    CType(sender, Control).BackColor = Color.Yellow
    CType(sender, Control).ForeColor = Color.Black
End Sub

在线尝试：https://tio.run/##y0osSyxOLsosKNHNy09J/f@/LLFIoUDBVkHd0NDIyNjYxMTU1MxM3ZqLCyRRlJqeWgGU1NeINjAyMbOI1YQz9NO5uJLz84rzc1L1cvLTNQr0ilILchKTUzXAmnQU1FUMdVWM1DU1rbn@/wcA

Answer 3

替换

numArr.push('-');

使用

numArr.splice(i, 0, '-');

Answer 4

function insertHyphen(str) {
  var strArr = str.split('');
  var numArr = strArr.map(Number);
    for(var i = 0; i < numArr.length; i++) {
      if(numArr[i-1]%2===0 && numArr[i]%2===0) {
        numArr.splice(i, 0, '-');
      }
    }
  return numArr.join('');
}
console.log(insertHyphen('025468 '));

Answer 5

Push在数组的末尾插入元素。您可以使用splice在特定位置输入元素。

arr.splice(index, 0, item);

此处索引是您要插入item元素的位置。 0表示不删除0个元素。

function insertHyphen(str) {
  var strArr = str.split('');
  var numArr = strArr.map(Number);
  for(var i = 0; i < numArr.length; i++) {
   if(numArr[i-1]%2===0 && numArr[i]%2===0) {
        numArr.splice(i, 0, '-');
    }
  }
  return numArr.join('');
}

console.log(insertHyphen('112233445566'));

Answer 6

一种简单的方法：

function insertHyphen(str) {
  var strArr = str.split('');
  var numArr = strArr.map(Number);
  var result ="";
  for(var i = 0; i < numArr.length; i++) {
   if((numArr[i+1]!==undefined)&&(numArr[i]%2===0 && numArr[i+1]%2===0)) {
        //numArr.push('-');
        result = result + numArr[i] + "-";
    }else{
        result = result + numArr[i];
    }
  }
  return result;
}
console.log(insertHyphen('112233445566'));

Answer 7

您可以通过检查值和前任字符串来映射新字符串。

 UserCredential credential;
  using (var stream = new FileStream("client_secrets.json", FileMode.Open, FileAccess.Read))
  {
    credential = await GoogleWebAuthorizationBroker.AuthorizeAsync(
        GoogleClientSecrets.Load(stream).Secrets,
        // This OAuth 2.0 access scope allows for full read/write access to the
        // authenticated user's account.
        new[] { YouTubeService.Scope.Youtube },
        "user",
        CancellationToken.None,
        new FileDataStore(this.GetType().ToString())
    );
  }

Answer 8

使用push（）方法和单循环

let input = '346845';
let result = [input[0]], 
len = input.length;

for (var i = 1; i < len; i++) {
  if (input[i - 1] % 2 === 0 && input[i] % 2 === 0) {
    result.push('-', input[i]);
  } else {
    result.push(input[i]);
  }
}
console.log(result.join(''));

Answer 9

将数字转换为字符串
将数组的第一个元素保存到单独的数组中，即 newArray
在字符串长度上运行循环
检查当前元素是否可以被 2 整除。如果是，按“-”，否则按下一项。
最后用''连接newArray的数组元素。


    let a = 224578;
    let str = a.toString()
    var newArray=[arr[0]]
    if(arr?.length > 0){
            
            for (let i = 0; i < arr.length; i++) {
                if(arr[i] % 2 === 0 && arr[i+1] % 2 === 0){
                    newArray.push('-', arr[i+1])
                } else{
                    newArray.push(arr[i+1])
                }
            }
        }

    console.log('newArray', newArray.join(''))

如何在特定数字的每两个偶数数字之间插入破折号

9 个答案: