jquery实现textarea 高度自适应 转自http://www.jb51.net/article/61997.htm

之前给大家分享过用Javascript控制文本框textarea高度随内容自适应增长收缩，今天花了点时间换了种实现方法，总结一下

复制代码代码如下:

jQuery.fn.extend({

            autoHeight: function(){

                return this.each(function(){

                    var $this = jQuery(this);

                    if( !$this.attr('_initAdjustHeight') ){

                        $this.attr('_initAdjustHeight', $this.outerHeight());

                    }

                    _adjustH(this).on('input', function(){

                        _adjustH(this);

                    });

                });

                /**

                 * 重置高度 

                 * @param {Object} elem

                 */

                function _adjustH(elem){

                    var $obj = jQuery(elem);

                    return $obj.css({height: $obj.attr('_initAdjustHeight'), 'overflow-y': 'hidden'})

                            .height( elem.scrollHeight );

                }

            }

        });

        // 使用

        $(function(){

            $('textarea').autoHeight();
        });