javascript and dom1

<script type="text/javascript">

            //  

            var beatles=Array(4);

            var beatles=Array();

                console.log(beatles);//[]

            beatles[0]="John";

            beatles[1]="Paul";

            beatles[2]="George";

            beatles[3]="Ringo";

                console.log(beatles[3]);//Ringo

            var beatles=Array("John","Paul","George","Ringo");

                console.log(beatles.length);//4

            var beatles=["John","Paul","George","Ringo","Liuwei"];

                console.log(beatles[4]);//Liuwei

            var lennon=["John",1940,1943];

                console.log(lennon.length);//3

            var name="John";

            beatles[0]=name;

                console.log(beatles[0]);//John

            var names=["Ringo","John","George","Paul"];

            beatles[1]=names[2];

                console.log(beatles[1]);//George

            var lennon=["Ringo",1940,false];

            var beatles=[];

            beatles[0]=lennon;

                console.log(beatles[0]);//["Ringo",1940,false]

            var lennon=Array();

            lennon["name"]="John";//          

            lennon["year"]=1943;

            lennon["living"]=false;

            console.log(lennon);//[]

                                //living  false

                                //name    "John"

                                //year    1943





        </script>