jQuery实现textarea高度根据内容自适应

1 //jQuery实现textarea高度根据内容自适应2 $.fn.extend({3 txtaAutoHeight: function () {4 return this.each(function () {5 var $this = $(this);6 if (!$this.attr('initAttrH')) {7$this.attr('initAttrH', $this.outerHeight());8 }9 setAutoHeight(this).on('input', function () {10setAutoHeight(this);11 });12 });13 function setAutoHeight(elem) {14 var $obj = $(elem);15 return $obj.css({ height: $obj.attr('initAttrH'), 'overflow-y': 'hidden' }).height(elem.scrollHeight);16 }17 }18 });19 20 //调用21 $(function () {22 $("#txtaMain").txtaAutoHeight();23 });