1
<p id="demo">点击按钮显示一个随机数</p>2
<button onclick="myFunction()">点我</button>3
<script>4
function myFunction() {5
document.getElementById("demo").innerHTML = Math.random();6
}7
</script>
<p id="demo">点击按钮显示一个随机数</p><button onclick="myFunction()">点我</button><script> function myFunction() { document.getElementById("demo").innerHTML = Math.random(); }</script>