在node_modules文件中查找

bpmn-js\dist\bpmn-modeler.development.js
bpmn-js\lib\BaseViewer.js

在文件中搜索linkMarkup

var linkMarkup ='<a href="http://bpmn.io" ' +'target="_blank" ' +'class="bjs-powered-by" ' +'title="Powered by bpmn.io" ' +'style="position: absolute; bottom: 15px; right: 15px; z-index: 100">' +img +'</a>';
// 修改
var linkMarkup = ''