JavaScript 数组小坑

错误示例：

    for (var i = 0; i < 6; i++) {
        // var unique = seqer.gensym();
        var unique = i + '123';
        document.writeln(unique[i] + ",");
    };

输出结果为：0, 1, 2, 3, undefined, undefined, 

正确示例：

    for (var i = 0; i < 6; i++) {
        // var unique = seqer.gensym();
        var unique = i + '123';
        document.writeln(unique + ",");
    };

正确示例：

    for (var i = 0; i < 6; i++) {
        // var unique = seqer.gensym();
        var unique = [];
        unique[i] = i + '123';
        document.writeln(unique[i] + ",");
    };

输出结果为：0123, 1123, 2123, 3123, 4123, 5123, 

==TBC==