Try the following code to solve this escaping issue.
<select name="selector" id="selector" class="easyui-combobox"
data-options="onLoadSuccess:function(){
var tmp = $('<div/>').appendTo('body');
var rows = $(this).combobox('getData');
for(var i=0; i<rows.length; i++){
tmp.html(rows[i].text);
rows[i].text = tmp.text();
}
tmp.remove();
}">
<option selected="selected" value="0"> </option>
<option value="1">=</option>
<option value="2">>=</option>
<option value="3">><</option>
</select>