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<!DOCTYPE html> <html> <body> <h1>JavaScript 数组</h1> <p>在数组中搜索项目 "Apple"，从位置 4 开始搜索：</p> <p id="demo"></p> <script> const fruits = ["Banana", "Orange", "Apple", "Mango", "Apple"]; document.getElementById("demo").innerHTML = fruits.indexOf("Apple", 4); </script> </body> </html>