一个简单的jquery的多选下拉框(自写)_jquery

(function(){
$.fn.extend({
checks_select: function(options){
jq_checks_select = null;
$(this).click(function(e){
jq_check = $(this);
//jq_check.attr("class", "");
if (jq_checks_select == null) {
jq_checks_select = $("").insertAfter(jq_check);
$.each(options, function(i, n){
check_div=$("").appendTo(jq_checks_select);
check_box=check_div.children();
check_box.click(function(e){
//jq_check.attr("value",$(this).attr("value") );

temp="";
$("input:checked").each(function(i){
if(i==0){
temp=$(this).attr("value");
}else{
temp+="、"+$(this).attr("value");
}
});
jq_check.attr("value",temp);
e.stopPropagation();
});
});
}else{
jq_checks_select.toggle();

}
e.stopPropagation();
});
$(document).click(function () {
jq_checks_select.hide();
});
//$(this).blur(function(){
//jq_checks_select.css("visibility","hidden");
//alert();
//});
}
})

})(jQuery);