Detailed example of JavaScript array sorting reverse() and sort() methods

This article mainly introduces the JavaScript array sorting reverse() and sort() methods in detail. Friends in need can refer to it. I hope it can help everyone.

There are two methods for sorting arrays in JavaScript: reverse() and sort().

The reverse() method will reverse the order of the array items:

var arr = [1,2,3,4,5];
 arr.reverse();
 alert(arr); //5,4,3,2,1

The sort() method will sort the array items in ascending order of the string, sort() The method calls the tostring() method of each array item. Even if each item in the array is a numeric value, the sort() method compares strings:

 var arr = [1,2,11,15,5];
arr.sort();
alert(arr); // 1,11,15,2,5

This approach is not the best solution in many cases, so the sort() method can receive a comparison function as a parameter. The comparison function takes two parameters. If the first parameter should be before the second parameter, it needs to return a negative number. If the two parameters are equal, it will return 0. If the first parameter should be after the second parameter, it will return a Positive numbers:

var arr = [1,2,11,15,5];
arr.sort(function(val1,val2){
return val1-val2;
 });
 alert(arr); // 1,2,5,11,15

Because comparison functions affect the sorting results by returning a value less than zero, equal to zero, or greater than zero, the subtraction operation can handle these situations well.

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