想實現layui多選下拉框 var select = $(this)                             ,title = reElem.find('.' + TITLE)                             ,input = title.find('input')                             ,multiSelect = title.find(".multiSelect")                             ,dl = reElem.find('dl:eq(0)')                             ,dds = dl.find('div>dd').length==0 ? dl.find('dd') : dl.find('div>dd')                             ,index =  this.selectedIndex //當前選中的索引                             ,nearElem //select 組件當前選中的附近元素，用于輔助快捷鍵功能                             ,omit = typeof select.attr("lay-omit") === 'undefined' // 簡寫為 已選擇x條                             ,isMulti = typeof select.attr('multiple') && typeof select.attr('multiple') === 'string';                         that.hidePlaceholder(title,select);                        if(disabled) return;這個是form源碼 改了一部分沒有改好