<!doctype html><html><head><meta charset="UTF-8"><title></title></head><body><textarea name="" id="textarea" class="mytest"></textarea></body><script src="js/jquery-2.1.1.min.js"></script><script> ???????//jQuery实现textarea高度根据内容自适应 ???????$.fn.extend({ ?????????txtaAutoHeight: function () { ???????????????return this.each(function () { ???????????????var $this = $(this); ?????????????????????if (!$this.attr(‘initAttrH‘)) { ????????????????????????$this.attr(‘initAttrH‘, $this.outerHeight()); ???????????????????} ???????????????????setAutoHeight(this).on(‘input‘, function () { ???????????????????????setAutoHeight(this); ??????????????????}); ???????????????}); ????????????????function setAutoHeight(elem) { ???????????????????var $obj = $(elem); ???????????????????return $obj.css({ height: $obj.attr(‘initAttrH‘), ‘overflow-y‘: ‘hidden‘ }).height(elem.scrollHeight); ????????????????} ?????????} ????????}); ????????????//调用 ????????$(function () { ???????????$(".mytest").txtaAutoHeight(); ????????});</script></html>jQuery让textarea自适应高度
原文地址：https://www.cnblogs.com/liumangdashi/p/8118000.html