动态设置表单元素的编辑属性

将表单元素禁用

txtOwnerPart.setDisabled(true);
txtOwnerPart.removeClass('x-form-text');
txtOwnerPart.addClass('form_field_readonly');

将表单元素启用

txtOwnerPart.setDisabled(false);
txtOwnerPart.removeClass('form_field_readonly');
txtOwnerPart.addClass('x-form-text');