默认会出现undefined但是当选择的时候不会出现

[保暖大裤衩LeoLee]

(function($) {
$.init();
/*---chengshi-----*/
var cityPicker3 = new $.PopPicker({
layer: 3
});
cityPicker3.setData(cityData3);
var chengshi = document.getElementById('chengshi');
chengshi.addEventListener('tap', function(event) {
cityPicker3.show(function(items) {
var address;
var province = items[0].text;
if (!province) {
province = "";
}
var city = items[1].text;
if (!city) {
city = "";
}
var area = items[2].text;
if (!area) {
area = "";
}
if(items[0].text == items[1].text) {
address = province + " " + area;
} else {
address = province + " " + city + " " + area;
}

document.getElementById("chengshi_input").value = address;
document.getElementById("chengshi_span").innerHTML = address;
});
}, false);
})(mui);


<div class="mui-input-row" style="border-bottom: 5px solid #EFEFF4;">
<label>选择城市</label>
<div class="si_div" id="chengshi" style="width: 65%;text-align: left;line-height: 50px; height: 50px;float: right;">
<span id="chengshi_span" class="si_da">${liveInfo.address}</span>
<img src="${path}/wap/img/create_04.png" class="city-pic">
<input type="hidden" class="result_input" id="chengshi_input" name="address" value="${liveInfo.address}"/>
</div>

</div>

[jio可]

页面加载的时候后台有传${liveInfo.address}吗？没有肯定就是undefined