html运行实例（eg_js_string_indexof

代码示例：（标识：eg_js_string_indexof_1）

<!DOCTYPE html>
<html>
<body>

<h1>JavaScript 字符串方法</h1>

<p>如果未找到文本，则 indexOf() 和 lastIndexOf() 都返回 -1：</p>

<p id="demo"></p>

<script>
var str = "The full name of China is the People's Republic of China.";
var pos = str.indexOf("USA");
document.getElementById("demo").innerHTML = pos;
</script>

</body>
</html>