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<!DOCTYPE html> <html> <body> <h1>JavaScript Array.indexOf()</h1> <p id="demo"></p> <script> var fruits = ["Apple", "Orange", "Apple", "Mango"]; var a = fruits.indexOf("Apple"); document.getElementById("demo").innerHTML = "Apple 被找到的位置是：" + (a + 1); </script> <p>Internet Explorer 8 或更早的版本不支持 indexOf()。</p> </body> </html>