javascriptreplace()正则替换实现代码

vardata="123123,213,<,12312,>,312,3,cat,dsfsdfs,";
alert(func(data));
functionfunc(str)
{
varreg=/<|>/g;
str=str.replace(reg,function($1){
if($1=="<"){
return"<";
}else{
return">";
}
});
returnstr;
}