代码编辑器：
x
1
<script>2
function myFunction(){3
document.getElementById("demo").innerHTML="Hello World";4
}5
</script>6
<p>单击按钮触发函数</p>7
<button onclick="myFunction()">点我</button>8
<p id="demo"></p>9
<script>function myFunction(){ document.getElementById("demo").innerHTML="Hello World";}</script><p>单击按钮触发函数</p><button onclick="myFunction()">点我</button><p id="demo"></p>