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