Delete operation in SharePoint 2010 REST

deleteListItem.js

function deleteListItem(webUrl, listName, itemId, success, failure) {
    getListItemById(webUrl,listName,itemId,function(item){
        $.ajax({
            url: item.__metadata.uri,
            type: "POST",
            headers: {
                "Accept": "application/json;odata=verbose",
                "X-Http-Method": "DELETE",
                "If-Match": item.__metadata.etag
            },
            success: function (data) {
                success();
            },
            error: function (data) {
                failure(data.responseJSON.error);
            }
        });
    },
   function (error) {
       failure(error);
   });
}

//Usage: delete Task with Id=3
deleteListItem('https://contoso.sharepoint.com/project/','Tasks',3,function(){
    console.log('Task has been deleted'); 
  },
  function(error){
    console.log(JSON.stringify(error));
  }
);