SwitchMenu is obsolete. Please use this one.

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@Marti
Sorry, I used to update the library, but I don't know why it became a new library. The new address is here https://openuserjs.org/libs/wishingking/GM_createMenu. I wanted to delete this post, but I don't have the right to delete it. Thank you for your advice! I got it.

When you write a plug-in, you suddenly find that you need a switch button or need to batch add menu.
What should I do?
Call the underlying API to implement?
It may not be too much trouble,
and after deleting the menu, the new menu will change its position up and down.
In short, dig the pit slowly.
Well, there is a switch menu library packaged today,
which perfectly solves the problem of adding switch menu and batch adding menu.
OK, have a good time!

See here for details：
https://openuserjs.org/libs/wishingking/GM_createMenu

You see:

example:

// @grant        GM_registerMenuCommand
// @grant        GM_unregisterMenuCommand
// @grant        GM_setValue
// @grant        GM_getValue
// @require      https://openuserjs.org/src/libs/wishingking/GM_createMenu.js

GM_createMenu.add([
    //switch menu
    {
        on : {
            default : true,
            name : "Open",
            callback : function(){
                alert("I'm Open.");
            }
        },
        off : {
            name : "Close",
            callback : function(){
                alert("I'm Close.");
            }
        }
    },
    {
        on : {
            name : "Edit",
            accessKey: 'E',
            callback : function(){
                alert("I am editing");
            }
        },
        off : {
            default : true,
            name : "Exit Edit",
            accessKey: 'X',
            callback : function(){
                alert("I'm exit.");
            }
        }
    },
    //common menu
    {
        name : "Common menu 1",
        callback : function(){
            alert("I'm Common menu 1");
        }
    },
    {
        name : "Common menu 2",
        callback : function(){
            alert("I am Common menu 2");
        }
    }
]);
GM_createMenu.create();

Or:

GM_createMenu.add({
    on : {
        default : true,
        name : "Open",
        callback : function(){
            alert("I'm Open.");
        }
    },
    off : {
        name : "Close",
        callback : function(){
            alert("I'm Close.");
        }
    }
});
GM_createMenu.add({
    on : {
        name : "Edit",
        accessKey: 'E',
        callback : function(){
            alert("I am editing");
        }
    },
    off : {
        default : true,
        name : "Exit Edit",
        accessKey: 'X',
        callback : function(){
            alert("I'm exit.");
        }
    }
});
GM_createMenu.create();

The last code of the above example is copied incorrectly. The correct code should be as follows:

SwitchMenu.add({
    on : {
        name : "Edit",
        accessKey: 'E',
        callback : function(){
            alert("I am editing");
        }
    },
    off : {
        default : true,
        name : "Exit Edit",
        accessKey: 'X',
        callback : function(){
            alert("I'm exit.");
        }
    }
});

When you write a plug-in, you suddenly find that you need a switch button.
What should I do?
Call the underlying API to implement?
It may not be too much trouble,
and after deleting the menu, the new menu will change its position up and down.
In short, dig the pit slowly.
Well, there is a switch menu library packaged today,
which perfectly solves the problem of batch adding switch menus.
OK, have a good time!

See here for details：
https://openuserjs.org/libs/wishingking/SwitchMenu

You see:

example:

//GM_registerMenuCommand GM_unregisterMenuCommand must be granted
// @grant        GM_registerMenuCommand
// @grant        GM_unregisterMenuCommand
// @require      https://openuserjs.org/src/libs/wishingking/SwitchMenu.js

SwitchMenu.add([
    {
        on : {
            default : true,
            name : "Open",
            callback : function(){
                alert("I'm Open.");
            }
        },
        off : {
            name : "Close",
            callback : function(){
                alert("I'm Close.");
            }
        }
    },
    {
        on : {
            name : "Edit",
            accessKey: 'E',
            callback : function(){
                alert("I am editing");
            }
        },
        off : {
            default : true,
            name : "Exit Edit",
            accessKey: 'X',
            callback : function(){
                alert("I'm exit.");
            }
        }
    }
]);
SwitchMenu.create();

Or:

SwitchMenu.add({
    on : {
        default : true,
        name : "Open",
        callback : function(){
            alert("I'm Open.");
        }
    },
    off : {
        name : "Close",
        callback : function(){
            alert("I'm Close.");
        }
    }
});
SwitchMenu.add({
    on : {
        default : true,
        name : "Open",
        callback : function(){
            alert("I'm Open.");
        }
    },
    off : {
        name : "Close",
        callback : function(){
            alert("I'm Close.");
        }
    }
});
SwitchMenu.create();