如何在JavaScript中对数组进行排序

Question

I am not using an associative array. I'm using 1d array like this,

array("1,a","5,b","2,c","8,d","6,f");

How can I sort this array?

The result should be,

array("1,a","2,c","5,b","6,f","8,d");

Answer 1

sort() without a custom sorting function will sort it how you wish (lexicographically).

>>> ["1,a","5,b","2,c","8,d","6,f"].sort();
["1,a", "2,c", "5,b", "6,f", "8,d"]

Note that this will sort the original array. You can make a shallow copy with slice() .

If any of your numbers are larger than 9 , and you want to sort it via the ordinal of the number, you will need a custom sorting function.

["1,a","5,b","2,c","8,d","6,f"].sort(function(a, b) {
    return parseInt(a, 10) - parseInt(b, 10);
});

Answer 2

Use array.sort() built-in JS function. Documentation here: http://www.w3schools.com/jsref/jsref_sort.asp

Answer 3

Try this

<script>
var abc=new Array("1,a","5,b","2,c","8,d","6,f");
document.write("<br/>");
document.write(abc.sort());
</script>

Answer 4

http://jsfiddle.net/Dht33/

var arrayVar = ["1,a","2,c","5,b","6,f","8,d"];

arrayVar.sort()

arrayVar; // "1,a","2,c","5,b","6,f","8,d"

Answer 5

try with:

function sortNumber(a,b)
{
return (a.split(","))[0] - (b.split(","))[0] ;
}

var n = ["1,a","5,b","2,c","8,d","6,f"];
alert( n.sort(sortNumber) );

Answer 6

Here's what I do:

var arr1 = new Array("1,a","5,b","2,c","8,d","6,f");
var arr2 = arr1.sort( function(a, b){
    var ax = a.split(",");
    var bx = b.split(",");
    return ax[0]-bx[0];
});

document.getElementById("result").innerHTML = arr2.join(" : ");

Answer 7

You need to write your own comparison function to compare the numbers, otherwise the default sort() would put something like "40,a" before "5,b" .

Here's an example which just splits on the , character and assumes the value before it is numerical. I've added "40,a" into the example to show that it orders numbers >9 correctly.

function mySort(a,b)
{
    return a.split(",", 1) - b.split(",", 1);
}

var theArray = ["1,a", "5,b", "2,c", "40,a", "8,d", "6,f"];
theArray.sort(mySort); // "1,a","2,c","5,b","6,f","8,d","40,a"

Answer 8

I'm going to go ahead and assume you want to sort by the number part first, sorting numerically, and then have a secondary lexographic (string) sort on the bit after the comma. That way a value like "11,a" will end up after "2,a" - if you just do a default sort "11,a" will end up before "2,a". So:

var a = ["1,a","11,a","8,a","24,z","5,b","2,c","8,d","6,f"];

a.sort(function(a,b) {
   var aparts = a.split(","),
       bparts = b.split(","),
       anum = +aparts[0], // convert first part to number
       bnum = +bparts[0],
       aletter = aparts[1],
       bletter = bparts[1];

   if (anum === bnum)
      return aletter < bletter ? -1 : aletter === bletter ? 0 : -1;
   else
      return anum - bnum;
});

Result:

["1,a", "2,c", "5,b", "6,f", "8,a", "8,d", "11,a", "24,z"]

Answer 9

Try this:

<script type="text/javascript">
var testArray = new Array();
testArray[0] = '1';
testArray[1] = '5';
testArray[2] = '9';
testArray[3] = '8';
testArray[4] = '6';
testArray[5] = '2';
var getlength = testArray.length;
testArray.sort(function(a,b){return a - b});
for(var i=0; i<getlength;i++) {         
    alert(testArray[i]);
}
</script>