我有一个 div 元素，它从一个函数中动态获取两个不同的动画 gif。
<div style="width:100px; height:100px" id="img0" data-bind="style : {backgroundImage: img()}"></div>
<button data-bind="click: function(data, event) { changeImg(); }">SWITCH IMG</button>
加载页面时，会显示第一个动画 gif，单击按钮时也会正确显示第二个动画。
self.changeImg = function () {
self.imgIndex(!self.imgIndex());
};
self.img = function () {
if(self.imgIndex())
return "url(GIF1)";
else
return "url(GIF2)"
};
return self;
}
但是，如果您尝试点击第二次，动画不会显示，您只会看到 gif 的最后一帧。
片段:https://jsfiddle.net/rickhaar/0keu6prx/40/
有没有办法在每次更改图像时重新启动动画同时保持 base64 格式？
最佳答案
这有点像 hack。每当 imgIndex 值发生变化时，将 src 设置为空字符串，然后再将其设置为实际图像。然后动画重新开始**
function vm() {
var self = this;
self.img = ko.observable(image1);
self.imgIndex = ko.observable(true);
self.changeImg = function() {
self.imgIndex(!self.imgIndex());
};
self.imgIndex.subscribe(() => {
self.img(''); // or some transparent icon
if (self.imgIndex()) {
setTimeout(() => self.img(image1))
} else {
setTimeout(() => self.img(image2))
}
});
return self;
}
const image1 = "data:image;base64,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",
image2 = 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";
ko.applyBindings(vm());<script src="https://cdnjs.cloudflare.com/ajax/libs/knockout/3.4.2/knockout-min.js"></script>
<img style="width:100px; height:100px" id="img0" data-bind="attr : {src: img}" />
<button data-bind="click: function(data, event) { changeImg(); }">SWITCH IMG</button>** 一些条件:
我已将
div更改为img，因为前者无法正常工作。我也浏览了其他一些 SO 答案。一瞬间，浏览器的未找到图像 图标出现。你可以 通过将
self.img设置为一个小的透明图标而不是一个空字符串来避免这种情况:self.img("/images/small-icon.png")此代码段似乎工作正常。但是在jsfidle中，有时动画没有重启
关于javascript - KnockoutJS - Base64 动画 gif 重启动画，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/53653673/