js array reverse, invert

JS Array.reverse reverses the order of array elements
Reprinted on March 10, 2016 16:02:34 33080

//JS Array.reverse reverses the order of the array elements
//In JavaScript, the reverse() method of the Array object will reverse (reverse) the order of the elements in the array. arr.reverse() implements this function on the original array, that is, reverse() changes the original array.
//Example 1:
var arr = ["f","e","i","e","s","o","f","t"];
document.writeln(arr.join()); // 输出：f,e,i,e,s,o,f,t
//invert
arr.reverse();
document.writeln(arr.join()); // 输出：t,f,o,s,e,i,e,f
//==================================================================================================
//Example 2: reverse the string
String.prototype.reverse = function(){
 var a = [];
 for (var i = 0; i