Hi Matthew,
Sorry for the mix-up. What you had mentioned are not the mistakes in the
original code. The program looks like it is working. But please look
carefully at the output from the browser. str1 is not sorted correctly
when printed the second time. (Although I did nothing to str1.)
I guess I did not copy the Java Script correctly into my email last
time. I just copied it from Visual Interdev. The following is the
original code:
<HTML>
<HEAD>
<META NAME="GENERATOR" Content="Microsoft Visual Studio 6.0">
<TITLE>JavaScript sort numbers</TITLE>
<script language="javascript">
var str1, str2;
function numsort(var1, var2) {
return var1 - var2;
}
array1 = new Array("1", "2", "12", "34", "72");
str1 = array1.sort(numsort);
document.write("str1 is numerically sorted as: " + str1 + "<br>");
str2 = array1.sort();
document.write("str2 is alphabetically sorted as: " + str2 + "<br>");
document.write("---------------------" + "<br>");
document.write("Reprint again" + "<br>" + "<br>");
document.write("str1 is numerically sorted as: " + str1 + "<br>");
document.write("str2 is alphabetically sorted as: " + str2);
</script>
</HEAD>
<BODY>
<P> </P>
</BODY>
</HTML>
The output is as Follows:
str1 is numerically sorted as: 1,2,12,34,72
str2 is alphabetically sorted as: 1,12,2,34,72
---------------------
Reprint again
str1 is numerically sorted as: 1,12,2,34,72
str2 is alphabetically sorted as: 1,12,2,34,72
Evidently, str1 is not sorted numerically any more in the second
printing. I didn't touch str1 at all after sorting. Why would this
variable change its value ? I had been scratching my head for this
behavior. Do appreciate very much if someone can tell me why.
Thanks.
David Seto
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