javascript - js array finds elements by index and returns

Question

js array Find the element by index and return the element

Answer 1

Array.prototype.itemOf = function(index) {

for (var i = 0; i < this.length; i++)
{

if (i === index)
{
    return this[i];
}

}
return -1;
};

Answer 2

arr[index], put the index in square brackets to directly access the relevant elements. Is that what you're asking?

Answer 3

Can you be more specific?

Answer 4

Need to find it?
?