update plugin-xss.md

docs/plugin/plugin-xss.md

@@ -4,4 +4,4 @@
 <img src="#" onerror= "td=document;td.getElementById('image-error').addEventListener('click', function(e){alert('image error')});"/>
 
 ## image onload
-<img src="https://img-cdn-aliyun.dcloud.net.cn//dev/img/ext/promotion/YunXin-uniapp-20231101.png" onload="td=document;td.getElementById('image-onload').addEventListener('click', function(e){alert('image onload')});">
\ No newline at end of file
+<img src="https://web-assets.dcloud.net.cn/unidoc/zh/unicloudlogo.png" onload="td=document;td.getElementById('image-onload').addEventListener('click', function(e){alert('image onload')});">
\ No newline at end of file