Javascript-after the mouse event is separated to js, it becomes invalid. just click in the tag.

I use js to traverse the dl tag and assign the onmouseover and onmouseout events to each dl tag. But it becomes invalid. directly add the event to the tag for credibility. My js code should be correct. What is going on? JavaScript has been imported. What's wrong? Thank you ~ This is HTML. this is js.

I use js to traverse the dl tag and assign the onmouseover and onmouseout events to each dl tag. But it becomes invalid. directly add the event to the tag for credibility. My js code should be correct. What is going on? JavaScript has been imported. What's wrong? Thank you ~
This is HTML

This is js

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I use js to traverse the dl tag and assign the onmouseover and onmouseout events to each dl tag. But it becomes invalid. directly add the event to the tag for credibility. My js code should be correct. What is going on? JavaScript has been imported. What's wrong? Thank you ~
This is HTML

This is js

This is very obvious. you first let the function be executed, instead of binding it to the function.

Navinodes [I]. onmouseover = function (e) {export how(e.tar get );}

If it is compatible, do it yourself!

It should be because an error occurred in the event listening. use addEventListener () or attachEvent () (for IE) to try again. The mobile phone end cannot post code, and you 'd better paste the code out.