http://jsfiddle.net/marcosfromero/aWyNn/

$('#yourdiv').                 // Get your box ...
  dialog().                    // ... and turn it into dialog (autoOpen: false also works)
  prev('.ui-dialog-titlebar'). // Get title bar,...
  find('a').                   // ... then get the X close button ...
  hide();                      // ... and hide it

以上这些都不起作用。真正有效的解决方案是：

$(function(){
  //this is your dialog:
  $('#mydiv').dialog({
    // Step 1. Add an extra class to our dialog to address the dialog directly. Make sure that this class is not used anywhere else:
    dialogClass: 'my-extra-class' 
  })
  // Step 2. Hide the close 'X' button on the dialog that you marked with your extra class
  $('.my-extra-class').find('.ui-dialog-titlebar-close').css('display','none');
  // Step 3. Enjoy your dialog without the 'X' link
})

请检查它是否适合您。

对于停用类，短代码：

$(".ui-dialog-titlebar-close").hide();

可以使用。

$(".ui-button-icon-only").hide();

document.querySelector('.ui-dialog-titlebar-close').style.display = 'none'

隐藏按钮的最佳方法是使用其数据图标属性对其进行过滤：

$('#dialog-id [data-icon="delete"]').hide();