jquery Sort函数

Example

Sort an array:

var fruits = ["Banana", "Orange", "Apple", "Mango"];
fruits.sort();

The result of fruits will be:

Apple,Banana,Mango,Orange

Definition and Usage

The sort() method sorts the items of an array.

The sort order can be either alphabetic or numeric, and either ascending or descending.

Default sort order is alphabetic and ascending.

Note: When numbers are sorted alphabetically, "40" comes before "5".

To perform a numeric sort, you must pass a function as an argument when calling the sort method.

The function specifies whether the numbers should be sorted ascending or descending.

It can be difficult to understand how this function works, but see the examples at the bottom of this page.

Note: This method changes the original array.

Browser Support

The sort() method is supported in all major browsers.

Syntax

array.sort( sortfunction)

Parameter Values

Parameter	Description
sortfunction	Optional. A function that defines the sort order

Return Value

Type	Description
Array	The Array object, with the items sorted

Technical Details

JavaScript Version:	1.1

More Examples

Example

Sort numbers (numerically and ascending):

var points = [40,100,1,5,25,10];
points.sort(function(a,b){return a-b});

The result of points will be:

1,5,10,25,40,100

Example

Sort numbers (numerically and descending):

var points = [40,100,1,5,25,10];
points.sort(function(a,b){return b-a});

The result of points will be:

100,40,25,10,5,1

Example

Sort numbers (alphabetically and descending):

var fruits = ["Banana", "Orange", "Apple", "Mango"];
fruits.sort();
fruits.reverse();

The result of fruits will be:

Orange,Mango,Banana,Apple

实例：

<p id="demo">Click the button to sort the array.</p>

<button it</button>

<script>

function myFunction()

{

var c_s=['2013-08','2013-07','2013-05','2013-09'];

var a=c_s.sort(function (a, b) {return a<b; });

var x=document.getElementById("demo");

x.innerHTML=a;

}

</script>

字符类型数组，用"return a-b"无法实现排序，用"return a>b"

数值类型数组，用"return a-b"、"return a>b"都能实现排序

当“return a<b;”时，按降序排列，结果为 2013-09,2013-08,2013-07,2013-05

当“return a>b;”时，按升序排列，结果为 2013-05,2013-07,2013-08,2013-09