Question

我有一个函数返回一个如下所示的数组：

.then(Cause.findOne(causeId).populate('admins').exec(function (err, cause) {

var ids = cause.admins.map(function(admin) {
  return admin.id;
})
   var join_ids = "'" + ids.join("','");

console.log（join_ids）;

的输出

'26c14292-a181-48bd-8344-73fa9caf65e7','64405c09-61d2-43ed-8b15-a99f92dff6e9','bdc034df-82f5-4cd8-a310-a3c3e2fe3106'

我试图将数组的第一个值作为userId过滤器传递给另一个函数：

    let message = {
  app_id: `${app_id}`,
  contents: {"en": "Yeah Buddy," + Cause.name + "Rolling Like a Big Shot!"},
  filters: [{'field': 'tag', 'key': 'userId', 'relation': '=', 'value': `${join_ids}`}]

和console.log（消息）的输出;

    { app_id: '*****************',
  contents: { en: 'Yeah Buddy,undefinedRolling Like a Big Shot!' },
  filters: 
   [ { field: 'tag',
       key: 'userId',
       relation: '=',
       value: '\'26c14292-a181-48bd-8344-73fa9caf65e7\',\'64405c09-61d2-43ed-8b15-a99f92dff6e9\',\'bdc034df-82f5-4cd8-a310-a3c3e2fe3106' } ],
  ios_badgeType: 'Increase',
  ios_badgeCount: 1 }

如果我把console.log（join_ids [0]）;

的console.log（消息）;

        { app_id: '*****************',
  contents: { en: 'Yeah Buddy,undefinedRolling Like a Big Shot!' },
  filters: 
   [ { field: 'tag',
       key: 'userId',
       relation: '=',
       value: 2} ],
  ios_badgeType: 'Increase',
  ios_badgeCount: 1 }

我的问题是如何将join_ids的输出变为索引为0,1,2,3的数组。

即。

join_ids[0] = '26c14292-a181-48bd-8344-73fa9caf65e7', join_ids[1] = '64405c09-61d2-43ed-8b15-a99f92dff6e9'

谢谢！

Answer 1

基于您的第二个代码段，它看起来像已经是一个数组。要确认这一点，您可以尝试使用console.log进行以下操作：

console.log(join_ids.length) // if this returns zero-based length then its an array

console.log(typeof(join_ids)) // get the TYPE of the variable 

console.log(join_ids[0])  // see if you can address the FIRST value individually


// for each loop over the array and console out EACH item in the array
for (var i = 0; i < join_ids.lenght; i++) {
    console.log(join_ids[i]);
}

如果你发现它是一个字符串，我会删除撇号

yourstring = yourstring.replace(/'/g, "")  // replaces all apostrophes

和逗号后的空格（如果存在），然后将值用双引号括起来并执行

join_ids = join_ids.split(',');  // makes the comma separated values an array

Fiddle example here

想要将输出转换为数组nodejs

1 个答案: