javascript - 下拉列表中的彩色选定行

Question

有没有办法为下拉列表中的选定行着色？也欢迎 jQuery/JavaScript

Answer 1

var select = document.getElementById("mySelectBox");
var oldSelectedIndex = select.selectedIndex;
select.addEventListener("change", function(){
    select.options[oldSelectedIndex].style.cssText = "";//or .className = ""
    select.options[oldSelectedIndex=select.selectedIndex].style.cssText = "color:red;";
}, true);