<html>
<body>
主页: <input type="url" id="myURL" value="/">
<p>点击按钮显示 URL 字段的URL地址。</p>
<button onclick="myFunction()">点我</button>
<p id="demo"></p>
<script>
function myFunction() {
var x = document.getElementById("myURL").value;
document.getElementById("demo").innerHTML = x;
}
</script>
</body>
</html>