javascript當中排序比較器用法
例 1.5（排序比較器)
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=utf-8"/>
for teach.
<script type="text/javascript">
function sortNumberqixy(a, b)
{
/* 馬克-to-win
returned value type: Array object
JavaScript syntax: - myArray.sort()
- myArray.sort(aComparator)
Argument list: aComparator A function object that will compare two items and returns a flag indicating their order in the sort collating sequence.
Sort the elements in an array.
You must make sure the comparator returns one of the following three values:
Negative integer(qixy: not a boolean.) - signifies that the first argument is less than the second.(qixy the whole final result is that small number is in front.)
Zero - Signifies that both arguments are the same.
Positive integer - Signifies that the first argument is larger than the second.
qixy: int=parseInt(String)
*/
if (parseInt(a) < parseInt(b)) return -5;
if (parseInt(a) > parseInt(b)) return 4;
else return 0;
/* the following is a simple method */
//return a - b
}
var arr = new Array(3)
arr[0] = "9"
arr[1] = "6"
arr[2] = "6"
arr[3] = "26"
arr[4] = "10001"
arr[5] = "2"
document.write(arr + "<br />");
/* note that if we don't give the comparator, sort will use the default way to sort. then it will sort according to String,then its order is 10001,2,26,6,6,9 */
document.write("排序之後：" + arr.sort());
document.write("排序之後：" + arr.sort(sortNumberqixy));
</script>
</head>
<body>
</body>
</html>
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