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<!DOCTYPE html> <html> <body> <h2>JavaScript 数组</h2> <p>使用数字索引（从 0 开始）访问 JavaScript 数组元素。</p> <p id="demo"></p> <script> var cars = ["Saab", "Volvo", "BMW"]; cars[0] = "Opel"; document.getElementById("demo").innerHTML = cars; </script> </body> </html>