JavaScript sort() 方法

sort() 方法用于对数组的元素进行排序。

规定排序顺序。必须是函数。

而且数组在原数组上进行排序,不生成副本。

 

例子 1

创建一个数组,并按字母顺序进行排序:

<script type="text/javascript">

var arr = new Array(6)
arr[0] = "George"
arr[1] = "John"
arr[2] = "Thomas"
arr[3] = "James"
arr[4] = "Adrew"
arr[5] = "Martin"

document.write(arr + "<br />")
document.write(arr.sort())

</script>

 

输出:

George,John,Thomas,James,Adrew,Martin
Adrew,George,James,John,Martin,Thomas

例子 2

创建一个数组,并按字母顺序进行排序:

<script type="text/javascript">

var arr = new Array(6)
arr[0] = "10"
arr[1] = "5"
arr[2] = "40"
arr[3] = "25"
arr[4] = "1000"
arr[5] = "1"

document.write(arr + "<br />")
document.write(arr.sort())

</script>

 

输出:

10,5,40,25,1000,1
1,10,1000,25,40,5

注意,上面的代码没有按照数值的大小对数字进行排序,要实现这一点,就必须使用一个排序函数:

<script type="text/javascript">

function sortNumber(a,b) {
  return a - b
}

var arr = new Array(6)
arr[0] = "10"
arr[1] = "5"
arr[2] = "40"
arr[3] = "25"
arr[4] = "1000"
arr[5] = "1"

document.write(arr + "<br />")
document.write(arr.sort(sortNumber))

</script>

 

输出:

10,5,40,25,1000,1
1,5,10,25,40,1000

例子 3

创建一个数组,并按数组里面集合中x的元素进行排序:

<script type="text/javascript">

var arr = new Array(6)
arr[0] = {x: '10', y: 'George'} 
arr[1] = {x: '5', y: 'John'}
arr[2] = {x: '40', y: 'Thomas'}
arr[3] = {x: '25', y: 'James'}
arr[4] = {x: '1000', y: 'Adrew'}
arr[5] = {x: '1', y: 'Martin'}

function compare(property) {
  return function(a, b) {
    var value1 = a[property];
    var value2 = b[property];
    return value1 - value2;
  };
}

console.log(JSON.parse(JSON.stringify(arr)));
console.log(arr.sort(compare('x')));
</script>

输出:

{x: '10', y: 'George'}, {x: '5', y: 'John'}, {x: '40', y: 'Thomas'}, {x: '25', y: 'James'}, {x: '1000', y: 'Adrew'}, {x: '1', y: 'Martin'}
{x: '1', y: 'Martin'}, {x: '5', y: 'John'}, {x: '10', y: 'George'}, {x: '25', y: 'James'}, {x: '40', y: 'Thomas'}, {x: '1000', y: 'Adrew'}

posted @ 2019-02-22 16:41  丿love丶暗影  Views(181)  Comments(0Edit  收藏  举报