获取选定元素的类型

我想要获取使用jQuery选择器选中的元素的类型。

标记：

Javascript：

var field_names = new Array(
    'a',
    'b',
    'c'
);
for(var i = 0; i < field_names.length; i++) {
    var field = $('[name=' + required_fields[i] + ']:visible');
    // ?????
    // 在这里我写什么来得到以下之一的输出：
    //    名为a的元素是
    //    名为b的元素是
    //    名为c的元素是    alert('名为' + required_fields[i] + '的元素是' + element_type);
}
</pre>
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