(function($){  //初始化清除按鈕 function initClear(target){ var jq = $(target); var opts = jq.data('combo').options; var combo = jq.data('combo').combo; var arrow = combo.find('span.combo-arrow');  var clear = arrow.siblings("span.combo-clear"); if(clear.size()==0){  //創(chuàng)建清除按鈕。  clear = $('<span class="combo-clear" style="height: 20px;"></span>');    //清除按鈕添加懸停效果。  clear.unbind("mouseenter.combo mouseleave.combo").bind("mouseenter.combo mouseleave.combo",  function(event){   var isEnter = event.type=="mouseenter";   clear[isEnter ? 'addClass' : 'removeClass']("combo-clear-hover");  }  );  //清除按鈕添加點(diǎn)擊事件，清除當(dāng)前選中值及隱藏選擇面板。  clear.unbind("click.combo").bind("click.combo",function(){  jq.combo("setValue","").combo("setText","");  jq.combo('hidePanel');  });  arrow.before(clear); }; var input = combo.find("input.combo-text"); input.outerWidth(input.outerWidth()-clear.outerWidth());  opts.initClear = true;//已進(jìn)行清除按鈕初始化。 }  //擴(kuò)展easyui combo添加清除當(dāng)前值。 var oldResize = $.fn.combo.methods.resize; $.extend($.fn.combo.methods,{ initClear:function(jq){  return jq.each(function(){   initClear(this);  }); }, resize:function(jq){  //調(diào)用默認(rèn)combo resize方法。  var returnValue = oldResize.apply(this,arguments);  var opts = jq.data("combo").options;  if(opts.initClear){  jq.combo("initClear",jq);  }  return returnValue; } });}(jQuery));

<select id="myselect" panelHeight="auto" style="width: 102px;" editable="true" name="itcast"> <option value="0">成都</option> <option value="1">傳智播客</option> <option value="2">姚欣</option> <option value="3">小星星</option></select>

$('#myselect').combobox({ required : true, editable : false}).combobox("initClear");

.combo-clear { background-color: #E0ECFF; width: 18px; height: 20px; overflow: hidden; display: inline-block; vertical-align: top; cursor: pointer; opacity: 0.6; filter: alpha(opacity=60); background: url('images/combo_clear.png') no-repeat center center;}.combo-clear-hover { opacity: 1.0; filter: alpha(opacity=100); background-color: #eaf2ff;}