The summary of JS array sorting method

Bubble sort

The code is as follows	Copy Code
<script type= "Text/javascript" > <!-- function Sort2 (obj) { var arr=obj; var temp; for (Var i=0;i<arr.length;i++) { for (Var j=i+1;j<arr.length;j++) { if (Arr[i]<arr[j]) { Temp=arr[i]; ARR[I]=ARR[J]; Arr[j]=temp; } } } return arr; } Alert (Sort2 ([3,2,5,6,10,8,4,1])); --> </script>

Column 2 uses the Sort method for sorting.

The code is as follows	Copy Code
<script type= "Text/javascript" > <!-- function Sort1 (obj) { var arr=obj; Arr.sort (function (a,b) {return a<b?1:-1}); return arr; } Alert (Sort1 ([3,2,5,6,10,8,4,1])); --> </script>

Sort also has an example

The code is as follows

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var Arrdemo = new Array (); Arrdemo[0] = 10; ARRDEMO[1] = 50; Arrdemo[2] = 51; ARRDEMO[3] = 100; Arrdemo.sort (); When the sort method is called, the array itself is changed, which affects the original array alert (Arrdemo);//10,100,50,51 By default the sort method is sorted in ASCII alphabetical order, not what we think is sorted by number size Arrdemo.sort (function (a,b) {return a>b?1:-1});//small to large sort alert (Arrdemo);//10,50,51,100 Arrdemo.sort (function (a,b) {return a<b?1:-1});//Sort from large to small alert (Arrdemo);//100,51,50,10

1. When the array calls the sort method, it affects itself (rather than generating a new array)

The 2.sort () method is sorted by character by default, so when you sort a numeric array, you can't take it for granted that it will be sorted by number size!

3. To change the default sort behavior (that is, sort by character), you can specify the collation function yourself (as shown in this example)

Efficiency after I test whether in IE7 or under FF3, are sort1 fast.

If you want to sort through the second column of data in a two-dimensional array:

code is as follows

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<script language= "javascript" <!-- var testarray = new Array ( ); testarray[0]= New Array (' E ', ' 2 ', ' G '); testarray[1]= New Array (' B ', ' 3 ', ' C '); testarray[2]= New Array (' A ', ' 1 ', ' a ');   testarray[3]= new Array (' d ', ' 4 ', ' h ');   Testarray.sort (sortfunction); Alert (testarray[0] + "" + testarray[1] + "+ testarray[2] +" "+ testarray[3]) There are two parameters in the //Sort method that represent the two elements used to sort in the array // Function sortfunction (x,y) {  return x[2].charcodeat (0)-y[2]. charCodeAt (0);//Descending sort }    //By the ASCII code of the first letter of the third column of the two-dimensional array; </script>