我不确定这是否可能,但我想将图像存储在JavaScript变量或对象中,当页面加载时,我希望在所需位置显示这些图像。
我想知道一些图片是否已被转换为二进制形式。它们能否使用JavaScript转换回图片?
我不确定这是否可能,但我想将图像存储在JavaScript变量或对象中,当页面加载时,我希望在所需位置显示这些图像。
我想知道一些图片是否已被转换为二进制形式。它们能否使用JavaScript转换回图片?
似乎OP正在请求如何在JavaScript中创建数据岛,特别是针对图像。之前给出的答案没有提供这样的方法,所以我在这里提供给您。
基本上,您将图像编码为 base64 字符串,然后将其设置为 DOM 元素的源。将 Image
对象的源设置为 url 不等效,因为它需要额外的 HTTP 连接。
var data = data:image/gif;base64, +
R0lGODlhAAEwAMQAAJ2M5Me98GRK1DoYyYBr3PHv++Pe99XO81Y50auc6PBkZEgpzbmt7HJa2I57 +
// snip //
fS3CqU7XGYgE+GqHvrLJ8Tr6qXmqiwAF9CffgnMNqmWHAWNBwwGsKpKsrmJqltOOV69nuYxSkqpo +
Tata18rWtrr1rTIIAQA7 ;
var icon_elem = document.getElementById("icon_here");
icon_elem.src = data;
以上代码和完整示例可在此处找到:http://www.kawa.net/works/js/data-scheme/base64-e.html
您可以简单地使用。
var img = new Image();
img.src = "http://yourimage.jpg";
创建DOM图像。
OM图像是一个包含图像二元形式的记忆器,因此没有必要将其改成像,因为它已经 s。
你看,这是一个简单的问题。但是,解决这个问题的方法并不是你现在尝试的那种方法。
What you think will work:
We ll store the image (its binary data) in a js variable, and then slap it on the page any time.
How it will work much more easily:
you just have to create a DOM image on the page, and set its source. The browser will fetch the image from the server automatically.
例子:
页: 1
var img_src = "http://someserver/yourimage.png";
var node = document.getElementById( the-node-in-which-i-want-my-image );
node.innerHTML = "<img src= "+img_src+" alt= my image >";
示例2:(使用jQuery)- 本质上与上面相同,只不过更容易编写:
var img_src = "http://someserver/yourimage.png";
$( #the-node-in-which-i-want-my-image )
.html("<img src= "+img_src+" alt= my image >");
现在还有一件事情:在此代码运行之后,浏览器开始获取图像,因此图像实际上在您将其插入到DOM中后稍微出现一点。
为了避免这种情况,您可以使用预取功能获取图片:
var prefetch = new Image();
prefetch.src = "http://someserver/yourimage.png";
干杯!
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