When you want to batch download images from website, consider using Firefox with DownThemAll! plugin.

Open DownThemAll! dialogue, you can see a text section called Mask. The *text* placeholder would be replace by the alt attribute of the <img> tag. You can use *text*.*ext* mask to download images.

For instance, if you want to download NextRadio album covers, you can generate a web page with many <img> elements with alt attribute:

<img class="nr-image-thumb" src="http://imgcache.qq.com/fm/photo/album/rmid_album_720/2/k/001c4m0d3SXH2k.jpg?r=1490963406203" alt=" 什么值得买(71316)">
<img class="nr-image-thumb" src="http://imgcache.qq.com/fm/photo/album/rmid_album_720/M/g/0041bWZF1QbPMg.jpg?r=1490963406203" alt=" 小情人资讯：青岛西海岸交易行情分析(73071)">