<input id="cc" class="easyui-combotree" style="width:200px;">

function getstyle() {
for (var i = 0; i < document.styleSheets.length; i++) {
var rules;
if (document.styleSheets[i].cssRules) {
rules = document.styleSheets[i].cssRules;
}
else {
rules = document.styleSheets[i].rules;
}
for (var j = 0; j < rules.length; j++) {
if (rules[j].selectorText.substr(0, 5) == ".icon")
$('#cc').combotree('tree').tree('append', {
data: [{
id: rules[j].selectorText.substr(1),
text: rules[j].selectorText.substr(1),
iconCls: rules[j].selectorText.substr(1)
}]
});
}
}
}
$(function () {
getstyle();
});