$ .ajax与GET

when we call $.ajax with GET method

$.ajax({
  type: "GET",
  url: "test.js",
  data: "id="+id
});

how to pass data to request file

is above given code is correct for that

Your one is correct (but data, not dataType), as well as

$.ajax({
  type: "GET",
  url: "test.js",
  data: {
      id: id
  }
});

is correct too

$.ajax({
  type: "GET",
  url: "test.js",
  data: "id="+id,   //not dataType  
  success: function(response) {
     //do osmething with response
  }
});

The option to pass data as part of the request is called data, not dataType.

Have a read of the different options you can pass at: http://api.jquery.com/jQuery.ajax/

You can either craft the query/data string yourself, or let jQuery do it by just passing an object.

so your ajax signature should look something like this:

$.ajax({
  type: "GET",
  url: "test.js",
  data: "id="+id
});

or

$.ajax({
  type: "GET",
  url: "test.js",
  data: {
      id: id
  }
});

should both work