Detailed Explanation of JavaScript Array Sorting Methods reverse() and sort()

There are two methods for array sorting 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, the sort() method will call the tostring() method of each array item, even if each item in the array is a number, the sort() method compares strings:

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

　　This method is not the best solution in many cases, therefore the sort() method can accept a comparison function as a parameter. The comparison function needs two parameters, if the first parameter should be before the second parameter, it should return a negative number, if the two parameters are equal, it should return 0, and if the first parameter should be after the second parameter, it should return a positive number:

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

　　Since the comparison function affects the sorting result by returning a value less than zero, equal to zero, or greater than zero, the subtraction operation can handle these situations very well.

Summary

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