Copy objects and extend objects to implement the extend () method in jquery

The extend () method of jq can easily implement the extension object method. The syntax is as follows: $. extend (obj1, boj2, obj3 );

What we need to implement now is: native js implements copying objects and extension objects, similar to the extend () method in jq. The specific example is as follows:

There are three objects:

The code is as follows:	Copy code
Var o1 = {hello: 1, old: 555 }, O2 = { Abc: 55555555, Hello: 2, Fun: function (){ Alert (111 ); } }, O3 = {third: 9999 };

Goals:

Copy the o1 object and extend the properties and methods of the o2 and o3 objects to the copied objects and output them.

The code is as follows:

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<Script> Var o1 = {hello: 1, old: 555 }, O2 = { Abc: 55555555, Hello: 2, Fun: function (){ Alert (111 ); } }, O3 = {third: 9999 }; Function cloneObj (oldObj) {// Copy object method If (typeof (oldObj )! = 'Object') return oldObj; If (oldObj = null) return oldObj; Var newObj = new Object (); For (var I in oldObj) NewObj [I] = cloneObj (oldObj [I]); Return newObj; }; Function extendObj () {// extension object Var args = arguments; If (args. length <2) return; Var temp = cloneObj (args [0]); // call the copy object method For (var n = 1; n <args. length; n ++ ){ For (var I in args [n]) { Temp [I] = args [n] [I]; } } Return temp; } Var t = extendObj (o1, o2, o3 ); Console. log (t ); Console. log (o1 ); Console. log (o2 ); Console. log (o3 ); </Script>