want to implement layui multi-selection drop-down box
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 //
,nearElem //select
,omit = typeof select.attr("lay-omit") === "undefined" // x
,isMulti = typeof select.attr("multiple") && typeof select.attr("multiple") === "string";
that.hidePlaceholder(title,select);
if(disabled) return;this is a part of the form source code that has not been changed.