what's the difference between the same method of combobox and textbox

[bartdou]

I didn't learn jquery much befor start using jquery-easyui, so I can not understand the description below totaly.
ComboBox:
Extend from $.fn.combo.defaults. Override defaults with $.fn.combobox.defaults.
Combo:
Extend from $.fn.textbox.defaults. Override defaults with $.fn.combo.defaults.
TextBox:
Extend from $.fn.validatebox.defaults. Override defaults with $.fn.textbox.defaults.

so I have question:
There is a method "clear" of combobox, and a same method "clear" of combo/textbox too, what's the difference between them?

html:

Code:

<input id="cc" class="easyui-combobox" name="dept" data-options="valueField:'id',textField:'text',url:'get_data.php'">

js code1:

Code:

$('#cc').combobox('clear');

js code2:

Code:

$('#cc').textbox('clear');

code2 leads to the same result as code1, is code2 a recommended way? If there is just 1 <input> it's ok to write codes strictly in Documentation standard format.
But if there are 20 <input> elements with textbox or combobox or datebox classes together like this:

Code:

<form id="fm">
  <input id="a" class="easyui-combobox">
  <input id="b" class="easyui-combobox">
  <input id="c" class="easyui-textbox">
  <input id="d" class="easyui-textbox">
  <input id="e" class="easyui-datebox">
  <input id="f"  class="easyui-datebox">
  ... ...
</form

I want to clear their values and write codes like this:

js code1

Code:

$('#a').combobox('clear');
$('#b').combobox('clear');
$('#c').textbox('clear');
$('#d').textbox('clear');
$('#e').datebox('clear');
$('#f').datebox('clear');
... ...

or like this:
js code2:

Code:

$('#fm').children('input').each(function() {
  $(this).textbox('clear');
});

Code2 has much less lines, is there anything wrong or inappropriate with code2 which  leads to the same result as code1?

[jarry]

You should call the method regarding the plugin. If you want to clear all the form fields, please call the form's 'clear' method instead.

Code:

$('#fm').form('clear');