execCommand SaveAs在Firefox中有效吗？

Question

execCommand SaveAs在Firefox中有效吗？

7 javascript firefox google-chrome bookmarklet

为什么这不适用于ff/chrome？

javascript: document.execCommand('SaveAs','true','http://www.google.com');

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(用作书签)

Answer 1

bdo*_*lan 10

execCommand没有完全标准化的浏览器.实际上,execCommand('SaveAs',...)似乎只在IE上得到支持.强制保存的推荐方法 - 如使用内容处置:附件标头,如http://www.jtricks.com/bits/content_disposition.html中所述

由于这是HTTP标头的一部分,因此您可以在任何文件类型上使用它.如果你使用Apache,您可以使用.htaccess文件添加标题,描述在这里.例如:

<FilesMatch "\.pdf$">
<IfModule mod_headers.c>
Header set Content-Disposition "attachment"
# for older browsers
Header set Content-Type "application/octet-stream"
</IfModule>
</FilesMatch>

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Answer 2

Bre*_*mir 9

可以通过数据URI(参见下载数据URL文件)和可选的下载属性在Firefox中执行此操作.

有关HTML5 shim演示,请参见http://html5-demos.appspot.com/static/a.download.html.

除了更改标题之外,如何在firefox中强制另存为对话框？也涵盖了这个主题.

您还可以通过以下Firefox测试的演示对其进行测试.

<!DOCTYPE html>
<body>
<script>
var a = document.createElement('a');
//alert(a.download === ''); // If true, this seems to indicate support
a.setAttribute('download', 'testme.png');
a.href = 'data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABAAAAAQCAYAAAAf8/9hAAAAwElEQVQ4jWNgGPRgv7Y2z0lj45STpqbHT5iaxhCt8biBgcJJU9PZJ01MPp80MfkPxZOJN8DEpAFJ4/+TJib/T5mY7CdK8wkTkwJ0zVA8naDmk0ZGPjg0/z9hbGyDV/MZY2ORkyYm77FpPmVispwSp6/e7+DAQtj5pqabsdi8myjNUANmY7H99jEjIxWiDDhuauqCxYDD+7W1eYgy4IyxMetJE5PpyH4/ZWqqTZRmGIAm3fsk2YwOjhkZqZCtmVQAAIOlmIi0XoodAAAAAElFTkSuQmCC';
a.innerHTML = 'testing';
a.style.display = 'none';
document.body.appendChild(a);
a.click();
</script>

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以下内容也适用于URL以及没有下载属性的JavaScript启动的加载(尽管此方法不允许使用文件名,但它允许在新选项卡中进行预览):

<script>
var myText = 'Hello world!', 
    myHTML = '<b>'+myText+'</b>';

function openFile (textToEncode, contentType, newWindow) {
    // For window.btoa (base64) polyfills, see 
    // https://github.com/Modernizr/Modernizr/wiki/HTML5-Cross-browser-Polyfills
    var encodedText = window.btoa(textToEncode);
    var dataURL = 'data:' + contentType + ';base64,' + encodedText;
    if (newWindow) { // Not useful for application/octet-stream type
        window.open(dataURL); // To open in a new tab/window
    }
    else {
        window.location = dataURL; // To change the current page
    }
}
</script>

<h1>Hello world files:</h1>

<p>Octet stream type to prompts download dialog in Firefox, but with no 
   default file type or path:</p> 

<a href="data:application/octet-stream;base64,SGVsbG8sIFdvcmxkIQ%3D%3D">
    (text example)</a>
<a href="data:application/octet-stream;base64,PGI+SGVsbG8gd29ybGQhPC9iPg==">
    (HTML example)</a>
<button onclick="openFile(myHTML, 'application/octet-stream');">
    (HTML example, from JavaScript)</button>

<p>Quickly viewable (and manually savable) in browser but no dialog presented:</p>
<a href="data:text/plain;base64,SGVsbG8sIFdvcmxkIQ%3D%3D">(plain text, same window)</a>
<a href="data:text/plain;base64,SGVsbG8sIFdvcmxkIQ%3D%3D" target="new-tab">
    (plain text--in new tab)</a>
<a href="data:text/html,%3Ch1%3EHello%2C%20World!%3C%2Fh1%3E">(HTML, same window)</a>
<button onclick="openFile(myText, 'text/plain');">
    (text example, from JavaScript)</button>
<button onclick="openFile(myText, 'text/plain', true);">
     (text example, from JavaScript; open in new window)</button>
<button onclick="openFile(myHTML, 'text/html', true);">
   (HTML example, from JavaScript; open in new window)</button>

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