En este artículo, analizaremos la recopilación de turnos de Backbone.js. La colección pop Backbone.js se usa para eliminar y devolver el primer modelo de la colección dada.
Sintaxis:
collection.pop(models, options)
Parámetros: Tomará un parámetro.
- opciones: este parámetro toma el tipo de modelo que se eliminará de la colección dada.
Ejemplo 1: en este ejemplo, crearemos un modelo Food y aplicaremos shift().
HTML
<!DOCTYPE html>
<html>
<head>
<script src="https://code.jquery.com/jquery-2.1.3.min.js"
type="text/javascript"></script>
<script src=
"https://cdnjs.cloudflare.com/ajax/libs/underscore.js/1.8.2/underscore-min.js"
type="text/javascript"></script>
<script src=
"https://cdnjs.cloudflare.com/ajax/libs/backbone.js/1.1.2/backbone-min.js"
type="text/javascript"></script>
<script type="text/javascript">
// 'Food' is a model and that contains the
// default value for the model
var Food = Backbone.Model.extend({
defaults: {
food_name: "Butter",
food_region:"Hyderabad"
}
});
// Here the 'FoodCollection' is a collection instance and
// model 'Food' is specified by overriding the 'model' property
var FoodCollection = Backbone.Collection.extend({
model: Food
});
// The instances "food1" and "food2" are
// created for the model "Food"
var food1 = new Food({name: "Icecream",
country:"Hyderabad"});
var food2 = new Food({name: "cake/chocos",
country:"Guntur"});
// The add() method adds the models 'food1' and 'food2'
// to the collection instance 'final'
var final = new FoodCollection();
final.add([food1,food2]);
// Get the count of total food using length
document.write("Actual Values:",
JSON.stringify(final.toJSON()));
document.write("<br>");
document.write("<br>");
// Apply shift() method
final.shift();
document.write('Values after Shift : ' +
JSON.stringify(final.toJSON()));
</script>
</head>
<body></body>
</html>
Producción:
Actual Values:[{
"name":"Icecream",
"country":"Hyderabad",
"food_name":"Butter",
"food_region":"Hyderabad"
},
{
"name":"cake/chocos",
"country":"Guntur",
"food_name":"Butter",
"food_region":"Hyderabad"
}]
Values after Shift : [{
"name":"cake/chocos",
"country":"Guntur",
"food_name":"Butter",
"food_region":"Hyderabad"
}]
Ejemplo 2: En este ejemplo, crearemos un modelo Food y aplicaremos shift().
HTML
<!DOCTYPE html>
<html>
<head>
<script src="https://code.jquery.com/jquery-2.1.3.min.js"
type="text/javascript"></script>
<script src=
"https://cdnjs.cloudflare.com/ajax/libs/underscore.js/1.8.2/underscore-min.js"
type="text/javascript"></script>
<script src=
"https://cdnjs.cloudflare.com/ajax/libs/backbone.js/1.1.2/backbone-min.js"
type="text/javascript"></script>
<script type="text/javascript">
// 'Food' is a model and that contains the
// default value for the model
var Food = Backbone.Model.extend({
defaults: {
food_region:"india"
}
});
// Here the 'FoodCollection' is a collection instance and
// model 'Food' is specified by overriding the 'model' property
var FoodCollection = Backbone.Collection.extend({
model: Food
});
var food1 = new Food({name: "Icecream",
country:"Hyderabad"});
var food2 = new Food({name: "cake/chocos",
country:"Guntur"});
var food3 = new Food({name: "eggs",
country:"delhi"});
var food4 = new Food({name: "chicken",
country:"patna"});
// The add() method adds the models 'food1' and 'food2'
// to the collection instance 'final'
var final = new FoodCollection();
final.add([food1,food2,food3,food4]);
// Get the count of total food using length
document.write("Actual Values:",
JSON.stringify(final.toJSON()));
document.write("<br>");
document.write("<br>");
// Apply shift() method
final.shift();
document.write('Values after Shift : ' +
JSON.stringify(final.toJSON()));
</script>
</head>
<body></body>
</html>
Producción:
Actual Values:[{
"name":"Icecream",
"country":"Hyderabad",
"food_region":"india"
},
{
"name":"cake/chocos",
"country":"Guntur",
"food_region":"india"
},
{
"name":"eggs",
"country":"delhi",
"food_region":"india"
},
{
"name":"chicken",
"country":"patna",
"food_region":"india"
}]
Values after Shift : [{
"name":"cake/chocos",
"country":"Guntur",
"food_region":"india"
},
{
"name":"eggs",
"country":"delhi",
"food_region":"india"
},
{
"name":"chicken",
"country":"patna",
"food_region":"india"
}]
Publicación traducida automáticamente
Artículo escrito por bhanusivanagulug y traducido por Barcelona Geeks. The original can be accessed here. Licence: CCBY-SA