JavaScript Tutorial/String/substr
Reversing the string by suing the substr
<HTML>
<HEAD>
<SCRIPT>
function revString(str) {
retStr = "";
strArray = new Array(str.split(""));
for (i=str.length - 1 ; i > - 1 ; i--){
retStr += str.substr(i,1);
}
return retStr;
}
</SCRIPT>
</HEAD>
<BODY>
<FORM name="theForm">
Enter a text string:
<TEXTAREA name=inStr rows=5 cols=90>
</TEXTAREA>
<INPUT type=button value="Reverse String" onClick="document.theForm.results.value = revString(document.theForm.inStr.value)";>
<INPUT type=button name="theButton" value="Clear Results" onClick="document.theForm.results.value=""";>
Results<br>
<TEXTAREA name=results rows=5 cols=90>
</TEXTAREA>
</FORM>
</BODY>
</HTML>
String.substr()
Syntax
string.substr(num1, num2)
string.substr(num)