textarea 超过字数

<textarea name="" id="FashionStatement" cols="" rows=""></textarea>
<div id="statementRowChk"></div>

$('#FashionStatement').val('');
var limitNum = ;
var pattern = '还可以输入' + limitNum + '字';
$('#statementRowChk').html(pattern);
$('#FashionStatement').keyup(
function() {
var remain = $(this).val().length;
if (remain > ) {
pattern = '字数超过限制，请适当删除部分内容';
}
else {
var result = limitNum - remain;
pattern = '还可以输入' + result + '字';
}
$('#statementRowChk').html(pattern);
}
);