使用jquery使用父元素的属性设置子元素attr

I've got the following html:

我有以下html：

<ul id="clients-strip">
    <li>
    <a href="/go.html?url=https://example.com/case-studies/" data-colour="/images/made/assets/images/article-images/client-colour.png">
        <img src="/images/made/assets/images/article-images/client-grayscale.png" alt="Client" width="59" height="35">  
    </a>
    </li>
    </ul>
<ul