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<!DOCTYPE html>
<html>
<body>
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<h1>JavaScript 数组</h1>
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<p>使用数字索引（从 0 开始）访问 JavaScript 数组元素。</p>
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<p id="demo"></p>
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<script>
var cars = ["Audi", "BMW", "porsche"];
cars[0] = "Volvo";
document.getElementById("demo").innerHTML = cars;
</script>
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</body>
</html>
​