JS代碼：var city = document.getElementsByClassName("city-name");var city_ico = document.getElementsByClassName("ico-city");var city_list = document.getElementsByClassName("city-list")//ico翻轉function ico_rotate(){??? var classVal = city_ico[0].getAttribute("class");??? var city_hover = document.getElementsByClassName("city-hover");??? //判斷city是否存在??? if(city_hover.length !== 0){??????? classVal = classVal.replace(" city-hover"," ");??????? city_ico[0].setAttribute("class",classVal);??? }else{??????? classVal = classVal.concat(" city-hover");??????? city_ico[0].setAttribute("class",classVal);??? }};//顯示隱藏function toggle(className,num){??? var list = className[num].style.display;??? if(list == "block"){??????? className[num].style.display = "none";??? }else{??????? className[num].style.display = "block";??? }city[0].addEventListener("mouseover",ico_rotate);city[0].addEventListener("mouseout",ico_rotate);city[0].addEventListener("mouseover",function(){??? toggle(city_list,0);});city[0].addEventListener("mouseout",function(){??? toggle(city_list,0);});