Javascript：image object - > HTML图像元素 [英] Javascript: image object -> HTML image element
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问题描述
代码将图像预加载到图像对象中，然后（应该）将其设置为HTML上的图像元素src：
<！DOCTYPE html>
< html>
< head>
< script language =javascript>
window.onload = function（）{
var oImage = new Image（）;
oImage.onload = function（）{
document.getElementById（'myImage'）。src = oImage;
alert（'done'）;
};
oImage.src ='image1.jpg';
}
< / script>
< / head>
< body>
< img id =myImagesrc =/>
< / body>
< / html>
为什么它不起作用？
解决方案
试试
<！DOCTYPE html>
< html>
< head>
< script language =javascript>
window.onload = function（）{
var oImage = new Image（）;
oImage.onload = function（）{
document.getElementById（'myImage'）。src = oImage.src;
alert（'done'）;
};
oImage.src ='image1.jpg';
};
< / script>
< / head>
< body>
< img id =myImagesrc =/>
< / body>
< / html>
您无法为图片设置 src ，您必须将其设置为图像的 src。（PS：在末尾添加分号并将 .src = oImage 更改为 .src = oImage.src ）
The code preloads an image into an image object and then (supposed to) set it to the image element src on HTML:
<!DOCTYPE html>
<html>
<head>
<script language="javascript">
window.onload = function () {
var oImage = new Image();
oImage.onload = function () {
document.getElementById('myImage').src = oImage;
alert('done');
};
oImage.src = 'image1.jpg';
}
</script>
</head>
<body>
<img id="myImage" src="" />
</body>
</html>
Why it doesn't work?
解决方案
Try
<!DOCTYPE html>
<html>
<head>
<script language="javascript">
window.onload = function () {
var oImage = new Image();
oImage.onload = function () {
document.getElementById('myImage').src = oImage.src;
alert('done');
};
oImage.src = 'image1.jpg';
};
</script>
</head>
<body>
<img id="myImage" src="" />
</body>
</html>
You can't set a src to an image, you have to set it to the image's src. (PS: Added semicolon at the end and changed .src = oImage to .src = oImage.src)
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