[英]How to change up-arrow and down-arrow in button click
我正在使用 css 和 javascript 做一個切換按鈕,我的 html 部分是
<div class="banner" id="btn-accod">
<button class="banner-accordin" onclick="bannerOpen()">Here's how you know <i class="fa fa-angle-down" id="donar"></i></button>
</div>
腳本部分是
function bannerOpen(){
var ban = document.getElementById("banner-content");
var arrow = document.getElementById("donar");
if (ban.style.display === "none") {
ban.style.display = "block";
arrow .classList.toggle("fa-angle-up");
} else {
ban.style.display = "none";
}
}
但沒有變化,也沒有錯誤顯示為什么?
希望這會奏效!
<div class="banner" id="btn-accod">
<button class="banner-accordin" onclick="bannerOpen()">Here's how you know <i class="fa fa-angle-down" id="donar"></i></button>
</div>
function bannerOpen(){
var ban = document.getElementById("banner-content");
var arrow = document.getElementById("donar");
ban.style.display === "none" ?
ban.style.display = "block";
arrow.classList.toggle("fa-angle-up");
arrow.classList.toggle("fa-angle-down");
:
ban.style.display = "none"
arrow.classList.toggle("fa-angle-up");
arrow.classList.toggle("fa-angle-down");}
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