tryjs_string_indexof 在线代码实例

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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>W3Cschool教程(w3cschool.cn)</title>
</head>
<body>
<p id="p1">Click the button to locate where "locate" first occurs.</p>
<p id="p2">0</p>
<button onclick="myFunction()">点我</button>
<script>
function myFunction(){
    var str=document.getElementById("p1").innerHTML;
    var n=str.indexOf("locate");
    document.getElementById("p2").innerHTML=n+1;
}
</script>
</body>
</html>
 
 
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运行结果
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