javascript - Get the content in the tag and assign it to the title?

Question

<p title="">嗨，你的title</p>

Assign "Hi, your title" to title

Answer 1

var elem = document.querySelector("p");
elem.setAttribute("title", elem.innerText);

Answer 2

$("p").attr("title",$("p").text());

Answer 3

I don’t know what specific function you want, but if you want to assign a value, you can:

 <p title="" class="title">赋值啊啊啊啊</p>
    
    <script>
        let txt = $('.title').text();
        $('.title').attr('title',txt);
    </script>