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<!DOCTYPE html> <html> <body> <p>单击按钮显示元素“Apple”的第一个位置，从位置 4 开始搜索：</p> <button onclick="myFunction()">试一试</button> <p id="demo"></p> <script> function myFunction() { var fruits = ["Banana", "Orange", "Apple", "Mango", "Banana", "Orange", "Apple", "Mango"]; var a = fruits.indexOf("Apple", 4); document.getElementById("demo").innerHTML = a; } </script> <p><b>注意：</b> indexOf 方法是在 JavaScript 1.6 中引入的，在 Internet Explorer 8 及更早版本中不起作用。</p> </body> </html>