当我比较的字符串有符号时，如何进行字符串比较？

Question

我正在尝试从一个以临时自定义XML格式设置的文本文件中提取数据：

<question>
    <question_text>What should you do with your work when traveling?</question_text>
    <answer_correct>Keep it in somewhere locked and out of view</answer_correct>
    <answer_incorrect>Put it in the back seat so it's off your mind</answer_incorrect>
    <answer_incorrect>Put it in the front seat so it's easy to access</answer_incorrect>
    <answer_incorrect>Throw it out the window</answer_incorrect>
    <reason><p>PCWorld reported in 2014 that 31% of breaches are due to lost or stolen devices.  Hiding or locking away confidential materials and equipment is the best solution to prevent loss or theft.</p></reason>
</question>

我能够在JSFIDDLE http://jsfiddle.net/bhwxp4Lb/2/中正确解析数据：

for(var i=0;i<data.length;i++){
    if(data[i] == "<question>"){
        i++;
        a = "<question_text>";
        b = data[i];
        questions.push(b.substr(a.length,(b.length - (a.length+1))));
        i++;
        a = "<answer_correct>";
        b = data[i];
        answerText.push(b.substr(a.length,(b.length - (a.length+1))));
        i++;
        a = "<answer_incorrect>";
        b = data[i];
        answerText.push(b.substr(a.length,(b.length - (a.length+1))));
        i++;
        a = "<answer_incorrect>";
        b = data[i];
        answerText.push(b.substr(a.length,(b.length - (a.length+1))));
        i++;
        a = "<answer_incorrect>";
        b = data[i];
        answerText.push(b.substr(a.length,(b.length - (a.length+1))));
        i++;
        a = "<reason>";
        b = data[i];
        reasons.push(b.substr(a.length,(b.length - (a.length+1))));
        i++;
        answers.push(answerText);
    }
}

但是，它无法在我的本地环境中正常运行。我假设它必须对字符串中的less than（＆lt;）和greater than（＆gt;）符号执行某些操作;例如：if(data[I] == <question>)在JSFIDDLE中按预期工作，但在我的本地系统上没有。有谁知道如何解决这个问题？我这样做了吗？有没有更好的办法？当我正在比较的字符串有符号时，如何进行字符串比较？