js method to remove the first comma of a string

The code copy is as follows:

<script type="text/javascript">

var s=',dddd';

if (s.substr(0,1)==',')

s=s.substr(1);

document.write(s);

</script>

Here are some better codes:

The code copy is as follows:

<script language="javascript">

var str="asdfk,asdf345345,345345";

//Replace all characters except numbers and commas.

str=str.replace(/[^0-9,]*/g,"");

//Remove the first comma

if (str.substr(0,1)==',') str=str.substr(1);

// Remove the last comma

var reg=/,$/gi;

str=str.replace(reg,"");

alert(str);

</script>

The following mainly adds the method of removing multiple commas into one comma

The code copy is as follows:

function dostr(str){

str=trim(str);

var strarry=unique(str.split(","));

str=strarry.join(",");

str=str.replace(/,/ig,",");

str=str.replace(/[^0-9,]*/ig,"");

str=str.replace(new RegExp(',+',"gm"),',');

if (str.substr(0,1)==',') str=str.substr(1);

var reg=/,$/gi;

str=str.replace(reg,"");

return str;

}