jQuery EasyUI实现右键菜单变灰不可用效果

var tabcount = $('#tabs').tabs('tabs').length; //tab选项卡的个数 
  if (tabcount <= 1) { 
    $('#mm-tabcloseother').attr("disabled", "disabled").css({ "cursor": "default", "opacity": "0.4" }); 
  } 
  else { 
    $('#mm-tabcloseother').removeAttr("disabled").css({ "cursor": "pointer", "opacity": "1" }); 
  } 

var tabs = $('#tabs').tabs('tabs');   //获得所有的Tab选项卡 
var tabcount = tabs.length; //Tab选项卡的个数 
var lasttab = tabs[tabcount - 1]; //获得最后一个Tab选项卡 
var lasttitle = lasttab.panel('options').tab.text(); //最后一个Tab选项卡的Title 
var currtab_title = $('#mm').data("currtab"); //当前Tab选项卡的Title 
 
   if (lasttitle == currtab_title) { 
     $('#mm-tabcloseright').attr("disabled", "disabled").css({ "cursor": "default", "opacity": "0.4" }); 
   } 
   else { 
     $('#mm-tabcloseright').removeAttr("disabled").css({ "cursor": "pointer", "opacity": "1" }); 
   } 

var onetab = tabs[0]; //第一个Tab选项卡 
var onetitle = onetab.panel('options').tab.text(); //第一个Tab选项卡的Title 
   if (onetitle == currtab_title) { 
     $('#mm-tabcloseleft').attr("disabled", "disabled").css({ "cursor": "default", "opacity": "0.4" }); 
   } 
   else { 
     $('#mm-tabcloseleft').removeAttr("disabled").css({ "cursor": "pointer", "opacity": "1" }); 
   }