Bootstrap 4 select下拉框美化jquery插件

$('select').extendSelect({

    // Search input placeholder:

    search: 'Find',

    // Title if option not selected:

    notSelectedTitle: 'Pls select',

    // Message if select list empty:

    empty: 'Empty',

    // Class to active element

    activeClass: 'active',

    // Class to disabled element

    disabledClass: 'disabled',

    // Custom error message for all selects (use placeholder %items)

    maxOptionMessage: 'Max %items elements',

    // Delay to hide message

    maxOptionMessageDelay: 2000,

    // Popover logic (resize or save height)

    popoverResize: true,

    // Auto resize dropdown by button width

    dropdownResize: true

});