JavaScript custom array sorting method _javascript tips

This example describes the JavaScript custom array sorting method. Share to everyone for your reference. The specific analysis is as follows:

Array has its own sorting function, which is convenient to use, we have a point must be clear, is the basis for sorting, if the sort does not pass in the parameters, it is in the order of character encoding (Unicode encoding) sequence.

var a=["3", "2", "1"]; 
Console.log (a[0].charcodeat (0)); Wuyi 
Console.log (a[1].charcodeat (0));// 
Console.log (a[2].charcodeat (0));// 
Console.log (A.sort ( ));      ["1", "2", "3"] 
 
var a=["3", "You", "he"]; 
Console.log (a[0].charcodeat (0)); Wuyi 
Console.log (a[1].charcodeat (0));//20320 
Console.log (a[2].charcodeat (0));//20182 
Console.log ( A.sort ());      ["3", "he", "you"] 
 
var a=["3", "One", "222"]; 
Console.log (A.sort ())//["One", "222", "3"]  
           //Multiple characters are encoded according to the first character

But I think the best thing about sort is that you can customize the sort, which is also more common in practice, such as ordering an array of objects. For example, a line of an object array, based on one of the fields sorted, of course, you can also write a function to complete, but I do not think that the sort came convenient.

var list = [ 
  { 
    max:3, 
    avg:2, 
    min:1 
  }, 
  { 
    max:10, 
    avg:15, 
    min:20 
  }, 
  { 
    Max:8, 
    avg:5, 
    min:2 
  } 
]; 
To sort the list objects by the Max field, the small to large order 
//X,y is the single element of the array to compare, here is an element 
//Sort method in the list is to provide a comparison of the size of the rules, in other words, is to show who the big and small 
//Return value is true or false 
function Sortbyfield (x, y) {returns 
  X.max-y.max; 
} 
Console.log (List.sort (Sortbyfield));

The effect is as shown in the following illustration:

I hope this article will help you with your JavaScript programming.