发送数组以发布ajax

i need send mi post in this format

{
  "elements" : ["elem1", "elem2","elem3" ]  
}

and i have created this array :

var miElem=["elem1", "elem2","elem3" ]  

$.post({
          url: 'url',
          data: {"elements" : miElem} ,
          dataType: 'json',

          success: function(data) {
            console.log(data)

          }.bind(this),
          error: function(xhr, status, err) {
          console.log(err)
          }.bind(this)
        });

but dont work, the data send well, but the format is incorrect

Use $.ajax() like this.The use of $.post is not correct.Check the syntax for $.post.here https://api.jquery.com/jquery.post/

var miElem=["elem1", "elem2","elem3"];  

$.ajax({
          url: 'url',//give your url here
          type:'POST',
          data: {elements : miElem} ,
          dataType: 'json',
          success: function(data) {
            alert('success');//test for successful ajax request
            console.log(data);

          },
          error: function(xhr, status, err) {
          alert('error');//test for unsuccessful ajax request
          console.log(err);
          }
       });

You should used $.ajax instead of $.post. In $.ajax don't use success and error parameters. Use .done(), .fail(), .. (http://api.jquery.com/jquery.ajax/) it's more comprehensive. You can use .then() if you want to use promise.

Datatype parameter is for response type.

Your request is failing because

1. you passed incorrect arguments to $.post() method.
2. you did not set type:'POST' if you intended to use $.ajax.

for $.post() do the following:

$.post('url', {elements: miElem}).done(function(data) {
  console.log(data);
}).fail(function (error) 
  console.error(error);
});

for $.ajax do the following:

$.ajax({
  type: 'POST',
  url: 'url',
  data: {elements: miElem},
  success: function (data) {
    console.log(data);
  },
  dataType: 'json'
});