js determines whether a number in the array

 

var arr=new Array(10,110,34,60,52,65,18,66);
var flag=0;
for (var i = 0; i < arr.length; i++) {
    if(arr[i]==66){
        console.log(i);
        flag=1;
        break;
    }
}
if(flag==0){
    console.log("The array 66 is not " ); 
}