jQuery实现textarea高度根据内容自适应

//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 () {
        $("#txtaMain").txtaAutoHeight();
    });