var array = [];
array.push(1);
array.push(2);
array.push(3);
for(var i in array) {
console.log(i+":"+array[i]);
}

0:1 1:2 2:3 say:hello

for(var i in array){
if(array.hasOwnProperty(i)) {
console.log(i+":"+array[i]);
}
}