javascript - Modal 不会在 Firefox 上播放两次动画

Question

我有一个模式来查看图片，它只在 Firefox 上第一次播放动画。第一次打开的时候可以用，第二次打开的时候就没动画了。它适用于 Chrome 浏览器。

HTML

<img src="https://s-media-cache-ak0.pinimg.com/236x/e8/2e/cc/e82ecc7ea98248bfa8161dcfcef2974a.jpg" id="postimage"></img>

 <div id="myModal" class="modal">
  <span class="close" onclick="document.getElementById('myModal').style.display='none'">&times;</span>
  <img class="modal-content" id="modalImage">
</div>

CSS

.modal {
    display: none; 
    position: fixed; 
    z-index: 999999;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%; 
    overflow: auto; 
    background-color: rgba(0,0,0,0.8); 
}
#postimage:hover {
    opacity: 0.8;
    cursor: pointer;
}

.modal-content {
    display: block;
    width: 100%;
    margin: auto;
    max-width: 720px;
}

@-webkit-keyframes fadeIn {
    from {opacity:0.0}
    to {opacity:1}
}

@keyframes fadeIn {
    from {opacity:0.0}
    to {opacity:1}
}

.modal-content {
    -webkit-animation-name: fadeIn;
    -webkit-animation-duration: 1.8s;
    animation-name: fadeIn;
    animation-duration: 1.8s;
}
.close {
    position: absolute;
    top: 50px;
    right: 50px;
    color: #e3e3e3;
    font-size: 40px;
    font-weight: bold;
    transition: 0.3s;
}

.close:hover,
.close:focus {
    cursor: pointer;
    color: #787878;
}

JS

var modal = document.getElementById('myModal');

var img = document.getElementById('postimage');
var modalImg = document.getElementById("modalImage");
img.onclick = function(){
    modal.style.display = "block";
    modalImg.src = this.src;
}

var span = document.getElementsByClassName("close")[0];

span.onclick = function() {
  modal.style.display = "none";
}
window.onclick = function(event) {
    if (event.target == modal) {
        modal.style.display = "none";
    }
}

JSFIDDLE

Answer 1

尝试添加:

@-moz-keyframes fadeIn {
  from {
    opacity: 0.0;
  }
  to {
    opacity: 1;
  }
}

并更新 .modal-content :

  -moz-animation-name: fadeIn;
  -moz-animation-duration: 1.8s;
  -moz-transition-timing-function: ease-in;
  -moz-animation-iteration-count: 1;
  -moz-animation-fill-mode: both;

-moz- 专用于 Firefox，-webkit- 专用于 Chrome 或 Opera。在 here 上找到这个

transition-timing-function影响动画的加速，因此速度可以根据不同的持续时间进行调整

animation-iteration-count是动画循环播放然后停止的次数

animation-fill-mode影响动画如何将样式应用于目标