用于知道图像何时加载的Javascript回调 [英] Javascript callback for knowing when an image is loaded
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问题描述
我想知道图片加载完成的时间。有回调的方法吗?
I want to know when an image has finished loading. Is there a way to do it with a callback?
如果没有,是否有办法呢?
If not, is there a way to do it at all?
推荐答案
Image.onload()通常有效。
要使用它,您需要在设置src属性之前绑定事件处理程序。
To use it, you'll need to be sure to bind the event handler before you set the src attribute.
相关链接:
示例用法:
<html>
<head>
<title>Image onload()</title>
</head>
<body>
<img src="#" alt="This image is going to load" id="sologo"/>
<script type="text/javascript">
window.onload = function () {
var logo = document.getElementById('sologo');
logo.onload = function () {
alert ("The image has loaded!");
};
setTimeout(function(){
logo.src = 'http://stackoverflow.com/Content/Img/stackoverflow-logo-250.png';
}, 5000);
};
</script>
</body>
</html>
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