反正有没有让 div 模糊或聚焦？

Question

If i give a div a focus/blur event handler, when will the handler (if ever) run?

Answer 1

If you give the div a tabindex attribute, it will be able to accept focus:

<div id="example" tabindex="0">Random content</div>

You can then attach focus and blur event handlers as you normally would. For example:

document.getElementById("example").onfocus = function() {
    console.log("focused");
}

Focus will be given to the div when you click on it, and blur will trigger when you click on any other element.

Answer 2

If you give a div element a tabindex attribute, then it will be focusable (in browsers that support that part of the HTML 5 draft). Theoretically it will then fire focus and blur events.

Generally speaking, you shouldn't do that though.