Javascript 如何将变量用于jquery验证equalTo方法？

我想为jquery验证equalTo方法使用变量。但不适用于jquery选择器。我该怎么做

HTML

<form id="form" method="post">
    <div>
        <input type="password" name="pass1" id="passM" required />
    </div>
    <div>
        <input type="password" name="pass2" id="passR" required />
    </div>
    <button type="submit">Submit</button>
</form>

这样行吗

var form = $('#form'),
    el1  = '#'+form.find('#passM').attr('id'),
    el2  = form.find('#passR').attr('name');

var r = {};
r[el2] = { equalTo: el1 };

form.validate({
    rules: r
});

---

正确的！很抱歉。已编辑。只需继续添加到r对象。e、 g.r[elM]={equalTo:elN}；

var form = $('#form'),
    el1  = '#'+form.find('#passM').attr('id'),
    el2  = form.find('#passR').attr('name');

var r = {};
r[el2] = { equalTo: el1 };

form.validate({
    rules: r
});