<head>
<meta charset="UTF-8">
<title></title>
<script>
function addElement() {
var city = document.getElementById("city");
var liEl = document.createElement("li");
var text = document.createTextNode("深圳");
liEl.appendChild(text);
city.appendChild(liEl);
}
function delElement() {
var city = document.getElementById("city");
var liEl = document.getElementsByTagName("li");
city.removeChild(liEl[liEl.length - 1]);
}
</script>
</head>