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<!DOCTYPE html> <html> <body> <h2>JavaScript Array.indexOf()</h2> <p id="demo"></p> <script> var fruits = ["Apple", "Orange", "Apple", "Mango"]; var a = fruits.indexOf("Apple"); document.getElementById("demo").innerHTML = "Apple 索引位置" + a; </script> <p>indexOf() 在 Internet Explorer 8 和更早版本中不起作用。</p> </body> </html>