有没有一种方法可以在jQuery中克隆数组？

Question

This is my code :

var a=[1,2,3]
b=$.clone(a)
alert(b)

Doesn't jQuery have a 'clone' method? How can I clone an array using jQuery?

Answer 1

Just use Array.prototype.slice .

a = [1];
b = a.slice();

JSFiddle - http://jsfiddle.net/neoswf/ebuk5/

Answer 2

那jQuery.merge呢？

copy = $.merge([], a);

Answer 3

This is how i've done it :

var newArray = JSON.parse(JSON.stringify(orgArray));

this will create a new deep copy not related to the first one (not a shallow copy).

also this obviously will not clone events and functions, but the good thing you can do it in one line and it can be used for any king of object (arrays, strings, numbers, objects ...)

Answer 4

Change

b=$.clone(a) to b=$(this).clone(a) but it some time dont work

but is reported

http://www.fusioncube.net/index.php/jquery-clone-bug-in-internet-explorer

Solution you use simple inbuilt clone function of javascript

var a=[1,2,3];
b=clone(a);
alert(b);

function clone(obj){
    if(obj == null || typeof(obj) != 'object')
        return obj;
    var temp = obj.constructor();
    for(var key in obj)
        temp[key] = clone(obj[key]);
    return temp;
}

-ConroyP

A great alternative is

 // Shallow copy
  var b = jQuery.extend({}, a);

  // Deep copy
  var b = jQuery.extend(true, {}, a);

-John Resig

Check similar post

• What is the most efficient way to deep clone an object in JavaScript?

Answer 5

try

if (!Array.prototype.clone) {
    Array.prototype.clone = function () {
        var arr1 = new Array();
        for (var property in this) {
            arr1[property] = typeof (this[property]) == 'object' ? this[property].clone() : this[property]
        }
        return arr1;
    }​
}

use as

var a = [1, 2, 3]
b = a;
a.push(4)
alert(b); // alerts [1,2,3,4]
//---------------///
var a = [1, 2, 3]
b = a.clone();
a.push(4)
alert(b); // alerts [1,2,3]​

Answer 6

Another option is to use Array.concat:

var a=[1,2,3]
var b=[].concat(a);

Answer 7

 var a=[1,2,3] b=JSON.parse(JSON.stringify(a)); document.getElementById("demo").innerHTML = b; 

 <p id="demo"></p> 

Answer 8

ES6请使用点差

let arrayCopy = [...myArray];