现场演示：我的 HTML 文档

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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="utf-8">
    <title>JavaScript Loop Through an Array Using For-In Loop</title>
</head>
<body>
    <script>
    // An array with some elements
    var fruits = ["Apple", "Banana", "Mango", "Orange", "Papaya"];
     
    // Loop through all the elements in the array 
    for(var i in fruits) {  
        document.write("<p>" + fruits[i] + "</p>");
    }
    </script>
</body>
</html>