代码编辑器：
x
1
<p id="demo">单击按钮显示0.5的反正弦值</p>2
<button onclick="myFunction()">点我</button>3
<script>4
function myFunction(){5
document.getElementById("demo").innerHTML=Math.asin(0.5);6
}7
</script>8
<p id="demo">单击按钮显示0.5的反正弦值</p><button onclick="myFunction()">点我</button><script>function myFunction(){ document.getElementById("demo").innerHTML=Math.asin(0.5);}</script>