Use the for(in) statement to obtain the code of all event names under javascript_javascript skills

events=[];for(o in document)if(/^on/.test(o))events.push(o)
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<q id="result">0</q>
[Ctrl A select all Note: If you need to introduce external Js, you need to refresh to execute

]<script> events=['<ol>'];for(o in document)if(/^on/.test(o))events.push(o) result.innerHTML=events.sort().join('<li>') </script>