JS sample code to detect whether input characters contain illegal characters_javascript skills

Copy code The code is as follows:

function checks(t){
szMsg="[#_ %&'/",;:=!^]";
alertStr="";
for(i=1;i if(t.indexOf( szMsg.substring(i-1,i))>-1){
alertStr="Do not include illegal characters such as [#_%&'/",;:=!^]";
break ;
}
}
if(alertStr != ""){
alert(alertStr);
return false;
}
return true;
}