字符串和变量的拼接

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <script>
        var a = 10;
        var str = '我买了' + a + '个苹果';
        alert(str);
    </script>
</body>
</html>

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