JavaScript 跟踪全局变量

JavaScript keep track of global variable?

本文关键字：全局变量 跟踪 JavaScript      更新时间：2023-09-26

我试图使用questionID变量来跟踪一些问题和答案。但是我似乎对变量每次运行函数时都会丢失内存有问题？ 反正我就是这么想的。

当我问：颜色，然后回答：粉红色、紫色或绿色时，它会跳到最后一句话; else if(questionID == -1)这不是我的本意。

如何修复此行为？我在本地运行脚本。

var questionID = -1;
function askQ() {
    var findme = document.getElementById('askBox').value.toLowerCase();
    var dontUnderstand = new Array();
    dontUnderstand[0] = "Excuse me, What did You say ?";
    dontUnderstand[1] = "Sorry, I cant understand You now. ^_^";
    dontUnderstand[2] = "Sorry!, I got to go now... CU !";
    dontUnderstand[3] = "ohh... Can you repeat that one more time ?";
    var randomIndex = Math.round(Math.random() * 3);
    if (findme.match(/(age|old)/)) {
        document.getElementById('bubble').innerHTML = "ohh,, I am " +
            obj1.age + " years old, How old are You ?";
    }
    if (!isNaN(findme)) {
        document.getElementById('bubble').innerHTML = "ohh.. that's kinda old !";
    }
    if (findme.match(/(color)/)) {
        document.getElementById('bubble').innerHTML = "My favourite color " +
            " is Purple, What's yours ?";
        questionID = 6;
    }
    if (findme.match(/(pink|purple|green)/) && questionID == 6) {
        document.getElementById('bubble').innerHTML = "well...that's cute !!";
        questionID = -1;
    }
    if (findme.match(/(hi|hello)/)) {
        document.getElementById('bubble').innerHTML = "Hi there, nice to meet You !";
    } else if (questionID == -1) {
        document.getElementById('bubble').innerHTML = dontUnderstand[randomIndex];
    }
}

我会首先将其添加到函数的顶部和底部：

console.log('starting', questionID);

console.log('ending', questionID);

然后使用您的调试日志查看发生了什么...或者，您可以添加手表并使用Firebug或Chrome逐步完成代码

还想知道为什么你不使用jQuery... 

 if(findme.match(/(pink|purple|green)/) && questionID == 6){
              document.getElementById('bubble').innerHTML = "well...that's cute !!";
      // You're setting it to -1.
      questionID = -1;
  }

另外，为什么不通过将questionID作为askQ函数的属性来限制对全局对象的污染。

askQ.questionID = 6

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