A method of iterating through all the elements in an array by JS array

The easiest way to iterate the array in JS is to use a for and then use the arr.length length as a for maximum value to solve, let's take a look at some useful examples

For example, the for () {} traverses the array code as follows: <script type= "Text/javascript" > <!--var arr = new Array (13.5,3,4,5,6);  for (Var i=0;i<arr.length;i++) {Arr[i] = arr[i]/2.0} alert (arr); --> </script> example, the for in loop iterates through the array code as follows: