Code to simulate select_jquery

$(document).ready(function(){
var newSelect = $("#aa");
newSelect.click(function(e){
//If there is no class, that is, the closed state, expand
//The open state does not need to be processed, and the bubble execution document.click
if(this.className == ""){
this .className = "open";
$(this.nextSibling).slideDown("fast");
e.stopPropagation();//Prevent bubbling
}
});

//Close
function closeSelect(obj){
$(obj.nextSibling).slideUp("fast",function(){
obj.className = "";
});
}
$(document).bind("click", function() {
closeSelect(newSelect[0]);
});
newSelect.next( ).click(function(e){
var src = e.target;

//If any item is selected, select the selected text to perform the replacement operation and change the style, which is equivalent to select.onchange
//Bubble execution document.click close and collapse
if(src.tagName == "A"){
var PObj = src.parentNode;
PObj.previousSibling.innerHTML = src.innerHTML ;
$(src).siblings().removeClass();
src.className = "current";
PObj.nextSibling.value = src.getAttribute("value");
}
});
});