<!DOCTYPE html>
<html>
<body>
<p>点击这里来创建变量，并显示结果。</p>
<button onclick="myFunction()">点击这里</button>
<p id="demo"></p>
<script>
function myFunction()
{
var carname="Volvo";
document.getElementById("demo").innerHTML=carname;
}
</script>
</body>
</html>