這是我編寫的 javascript - 它提醒我.select2找到了四個實例和找到了四個select元素，并向控制臺記錄一條消息，但對我從 select2 框中選擇的內(nèi)容進行的任何更改實際上都不會記錄或提醒我變化。我懷疑我使用了錯誤的選擇器來查找要附加這些偵聽器的對象change，但我在文檔中找不到有關(guān)如何查找元素的完整示例select2。$(document).on('change', '.select2-input', function(e) {    console.log('Detected a different change!');    alert('The other method of detecting changes worked!');});$('.select2').on('change', function(e) {    console.log('Detected a change!');    alert('Something was changed!');});console.log('Loaded!');alert('Loaded v2 - found ' + $('.select2').length + ' instances of select2 and ' + $('select').length + ' instances of select.');