Disable Dragging via Brute Force:(通过蛮力禁用拖动：)
To disable dragging on the entire popup/document, you can do any one of the following:
(要禁用在整个弹出窗口/文档上的拖动，可以执行以下任一操作：)
- Add the following lines to your popup.js file:
(将以下行添加到您的popup.js文件中：)
function noDrag(event) {
event.preventDefault();
}
document.addEventListener('dragstart',noDrag,true);
- Or add this line to popup.js :
(或将此行添加到popup.js ：)
document.addEventListener('dragstart',function(event){event.preventDefault();},true);
<html ondragstart='event.preventDefault();'>
My personal preference is to use the named noDrag function.
(我个人的喜好是使用命名的noDrag函数。)
The named function instead of the closure merely because, at some point in the future, I might want to be selective about which elements have drag disabled.(命名函数而不是闭包，仅仅是因为在将来的某个时候，我可能想选择禁用拖动的元素。)
Having it named allows the same function to be re-used, or removed as a listener from an element, should that be desirable.(如果需要的话，将其命名可允许重用相同的功能，或者从元素中将其用作侦听器。)
The JavaScript instead of the HTML because A) you already have a JavaSctipt file for the popup and B) my opinion of the onxxxxx event attributes/properties is that they should be avoided when reasonable.(用JavaScript代替HTML，因为A）您已经有一个JavaSctipt文件用于弹出窗口，B）我对onxxxxx事件属性/属性的onxxxxx是，在合理的情况下应避免使用它们。)
If there was not already a JavaScript file associated with this popup, I would use the HTML ondragstart method.(如果还没有与此弹出窗口关联的JavaScript文件，我将使用HTML ondragstart方法。)
How it is supposed to work:(应该如何工作：)
The following does not disable dragging on <a> and <img> elements.
(以下内容不会禁止在<a>和<img>元素上拖动。)
The specs and documentation say that it is supposed to work to disable dragging.(规范和文档说应该可以禁用拖动。)
I need to delve further into the Firefox source code to figure out why it is not working.(我需要进一步研究Firefox源代码，以弄清为什么它不起作用。)
In Firefox (and the HTML specification), the element being draggable is controlled by the draggable attribute .
(在Firefox（和HTML规范）中，可拖动的元素由draggable属性控制。)
For images and links, the default value is true .(对于图像和链接，默认值为true 。)
For everything else, the default is false .(对于其他所有内容，默认值为false 。)
You will either need to have draggable="false" on all such elements in your HTML, or use JavaScript to setAttribute('draggable',false) , or element.draggable = false;(您可能需要在HTML中的所有此类元素上都具有draggable="false" ，或者使用JavaScript来setAttribute('draggable',false)或element.draggable = false;)
on all such elements.(在所有这些元素上。)
Firefox does not have a CSS property which can be used to control if an element is draggable.
(Firefox没有CSS属性，可用于控制元素是否可拖动。)
For more information see:
(有关更多信息，请参见：)
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