在JS中获取复选框选中的值

var months="";

var month=doncument.getElementsByName("month");

for(var i=0,i<month.length,i++){

    if(month[i].checked==true){

        if(i<(month.length-1)){

             var months+=month[i].value+'i';

        }else{

            var months+=month[i].value;

        }

    }

}