Mutual adding operation of options between two selects (jquery implementation)_jquery

I wrote a very simple jquery plug-in, which can be implemented by calling the functions in the page.
Plug-in source code (listtolist.js):

Copy code The code is as follows:

/**
fromid: the id of the source list.
toid: the id of the target list.
moveOrAppend parameter ("move" or "append"):
move -- the option selected in the source list will be deleted .The option selected in the source list is moved to the target list. If it already exists in the target list, the option will not be added.
append -- The option selected in the source list will not be deleted. The option selected in the source list is added to the target After the list, if the target list already exists, the option will not be added.

isAll parameter (true or false): whether to move or add all
*/
jQuery.listTolist = function(fromid,toid,moveOrAppend,isAll) {
if(moveOrAppend.toLowerCase() == "move") { / /Move
if(isAll == true) { //Move all
$("#" fromid " option").each(function() {
Target list, no operation will be performed when the option already exists in the target list.
                  $(this).appendTo($("#" toid ":not(:has(option[value=" $(this). val() "]))"));
         });                                              false) {
                                                                                                                                                                                                                                                                                                 Since No operation is performed.
$(this).appendTo($("#" toid ":not(:has(option[value=" $(this).val() "]))")); // The already existence of Option in the target list does not move, and it is still in the source list.
if ("#"#"#" option [value = "$ (this). Val () "]").length > 0) {
                                                                                         () "]").get(0)); 🎜> if(isAll == true) {
$("#" fromid " option").each(function() {
$("")
.val($(this).val())
     .text($(this).text())
    .appendTo($("#" toid ":not(:has(option[value= " $(this).val() "]))"));
              });                                   :selected").each(function() {
                                                                                             (this).text())
     .appendTo($("#" toid ":not(:has(option[value=" $(this).val() "]))"));
           });
       }
    }
};
/**
The function is basically the same as above ("move").
The difference is that when the selected option in the source list exists in the target list, the option in the source list will not be deleted.

isAll parameter (true or false): Whether to move or add all
*/
jQuery.list2list = function(fromid,toid,isAll) {
    if(isAll == true) {
        $("#" fromid " option").each(function() {
            $(this).appendTo($("#" toid ":not(:has(option[value=" $(this).val() "]))"));
        });
    }
    else if(isAll == false) {
        $("#" fromid " option:selected").each(function() {
            $(this).appendTo($("#" toid ":not(:has(option[value=" $(this).val() "]))"));
        });
    }
};

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