javascript - Why does .setAttribute not work with jQuery -

$(function () {      $('textarea').setattribute('style', 'height:' + ($('textarea').scrollheight) + 'px;');  });

<textarea>      very, long preloading text, mean vvveeerrryyy, vvveeerrryyy long one!  </textarea>

what doing wrong, please? double checked it, can't find wrong

1. its attr() .
2. change $('textarea').scrollheight $('textarea')[0].scrollheight.because return undefined
3. setattribute() not defined function in jquery. , don't forget add jquery library in html.

$(function () {  $('textarea').attr('style', 'height:' + ($('textarea')[0].scrollheight) + 'px;');    });

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>  <textarea>this very, long preloading text, mean vvveeerrryyy, vvveeerrryyy long one!</textarea>