<script type="text/javascript">
//<![CDATA[
String.prototype.setCharAt = function (int, string) {
var s = ""; int=isNaN(parseInt(int))?65536:parseInt(int);
for (var i=0; i<this.length; i++) s += (i==int?String(string):this.charAt(i));
return s;
}
var tt="1233";//
tt=tt.setCharAt(3,"never-online")
alert(tt)
//]]>
</script>
//<![CDATA[
String.prototype.setCharAt = function (int, string) {
var s = ""; int=isNaN(parseInt(int))?65536:parseInt(int);
for (var i=0; i<this.length; i++) s += (i==int?String(string):this.charAt(i));
return s;
}
var tt="1233";//
tt=tt.setCharAt(3,"never-online")
alert(tt)
//]]>
</script>
//<![CDATA[
var tt="123dddddddddddddddddd";
String.prototype.setCharAt=function(strFor,psti){
strFor+=''; psti-=0;
var suc=this; ar=new Array();
for(var i=0, j=0; i<=suc.length+1; i++, j++){
if(i==psti){
ar.push(strFor);
i++;
ar[i]=suc.substr(j,1);
}
ar[i]=suc.substr(j,1);
}
return ar.join('');
}
document.write(tt.setCharAt('4',0)+'<br/>');
document.write(tt.setCharAt('3',1));
//]]>
</script>
//<![CDATA[
var tt="123dddddddddddddddddd";
String.prototype.setCharAt=function(strFor,psti){
strFor+=''; psti-=0;
var suc=this; ar=new Array();
for(var i=0, j=0; i<=suc.length+1; i++, j++){
if(i==psti){
ar.push(strFor);
i++;
}
ar[i]=suc.substr(j,1);
}
return ar.join('');
}
document.write(tt.setCharAt('4',0)+'<br/>');
document.write(tt.setCharAt('3',1));
//]]>
</script>
//<![CDATA[
var tt="abcdefghijklmn";
String.prototype.setCharAt=function(strFor,psti){
strFor+=''; psti-=0;
var suc=this; ar=new Array();
for(var i=0, j=0; i<=suc.length; i++, j++){
if(i==psti){
ar.push(strFor);
i++;
}
ar[i]=suc.substr(j,1);
}
return ar.join('');
}
document.write(tt.setCharAt('4',0)+'<br/>');
document.write(tt.setCharAt('3',1));
//]]>
</script>
<script language=javascript>
String.prototype.SetCharAt=function(str,num)
{
var re=new RegExp("([\\s\\S]{"+(num-1)+"})[\\s\\S]([\\s\\S]*)")
return this.replace(re,"$1"+str+"$2")
}
alert("12345".SetCharAt("a",2))
</script>