菜鸟教程在线编辑器

AI 编程工具
 
                <!DOCTYPE html>
<html>
<head> 
<meta charset="utf-8"> 
<title>菜鸟教程(runoob.com)</title> 
</head>
<body>

<p id="demo">单击按钮来定位指定文本首次出现的位置。</p>
<button onclick="myFunction()">点我</button>
<script>
function myFunction(){
	var str="Hello world, welcome to the universe.";
	var n=str.indexOf("welcome");
	document.getElementById("demo").innerHTML=n;
}
</script>

</body>
</html>
              