javascript - AngularJS: delete charAt last index of "," -

how write code in angularjs delete character @ last index of ",".

here equivalent java code:

stringbuilder.deletecharat(stringbuilder.lastindexof(",")); 

please help.

you

str = str.replace(/,([^,]*)$/, "$1"); 

or

var pos = str.lastindexof(","); str = str.substr(0, pos) + str.substr(pos + 1);