15/8/2 object Simple, deep cloning (replication)

Reference: http://qianduanblog.com/post/js-learning-30-object-clone-copy.html

base data type: Boolean/number/string

var a= ' a '; var b;b=a;b= ' B '; Console.log (a); Console.log (b);

Cloning of a basic data type is a direct clone of an object, both of which are worth passing, and are not linked after cloning

Reference data type: Array/object/function

Cloning of arrays

var a = [1,2];var b;b = a;b[2] = 3;console.log (a);    {A-i}

　　This normal clone can see that both control the same object, which is the feature of the reference type. Two sets of unrelated arrays can be cloned by looping.

var a = [1,2];var b = [];var i = 0;var j = a.length;for (; i<j;i++) {  b[i] = A[i];            }　　B.push (3); Console.log (b);　　{1,2,3}console.log (a); {A}

　　

Because arrays are also objects, the clones and arrays of objects are the same

var a = {1: ' One ', 2: '}var b = {};for (var i in a) {    b[i] = a[i];} Console.log (b);     Object {1: "One", 2: "}b[3") = ' three '; Console.log (b);    Object {1: "One", 2: "Three"}console.log (1);    Object {1: "One", 2: "One"}

　　

the cloning of a function is special: the cloning of a function, using the "=" symbol, and changing the cloned object will not affect the object before cloning, because the cloned object will be copied once and store the actual data, is the real clone.

var x=function () {alert (1);}; var y=x;y=function () {alert (2);};/ /function () {alert (1);}; alert (x);//Y=function () {alert (2);}; alert (y);

　　 Complete object cloning:

The complete object cloning requires the type judgment of the parameters, which is a comprehensive application.

15/8/2 object Simple, deep cloning (replication)