요약

var arr1=[73,32,103,42,4];
var arr2=new Array(273,32,103,42,4);

arr1.push(2);

//앞쪽부터검색 없으면 -1리턴
var output1 = array.indexOf(4);

//출력
    array.forEach(function(element,index,arr){
        console.log(index+"/"+element);
    });

    for(var i in array){
        console.log(array[i]);
    }

==========================================================================

출처

https://blog.naver.com/PostList.naver?blogId=skawo32167&skinType=&skinId=&from=menu&userSelectMenu=true

<script type="text/javascript">

    var arr1=[73,32,103,42,4];

    var arr2=new Array(273,32,103,42,4);

    console.log(arr1[0]);

    console.log(arr2[0]);

    console.log(arr1.length);

    console.log(arr2.length);

    var arr=[0,1];

    arr.push(2);

    arr.push(3);

    arr.push(4);

    alert(arr);

</script>

배열에 검색기능을 사용할수있다.

<script type="text/javascript">

var array=[1,2,3,4,5,5,4,3,2,1];

//앞쪽부터검색 없으면 -1리턴

var output1 = array.indexOf(4);

var output2 = array.indexOf(8);

//뒤쪽부터 검새 없으면 -1리턴

var output3 = array.lastIndexOf(4);

var output4 = array.lastIndexOf(8);

var output ="";

output+=output1+" : "+output2+"\n";

output+=output3+" : "+output4;

console.log(output);

</script>

배열의 또다른 기능

<script type="text/javascript">

var array=["가","나","다","라"];

    array.forEach(function(element,index,arr){

        console.log(index+"/"+element);

    });

</script>

향상된 for문 배열

<script type="text/javascript">

var array=['포도','딸기','바나나','참외'];

for(var i in array){

    console.log(array[i]);

}

</script>