我正在建立一个可以通过选择框系统回答问题的系统。到目前为止有效

function changedValue(vraagId) {
    currentId = document.getElementById(vraagId+1).value;
    valueId = document.getElementById(vraagId).value;
    if (currentId == "") {
        document.getElementById(valueId+1).disabled = true;
        document.getElementById(valueId+2).disabled = true;
        document.getElementById(valueId+3).disabled = true;
        document.getElementById(valueId+4).disabled = true;
        document.getElementById(vraagId+1).value = valueId;
    }
    else {
        document.getElementById(valueId+1).disabled = true;
        document.getElementById(valueId+2).disabled = true;
        document.getElementById(valueId+3).disabled = true;
        document.getElementById(valueId+4).disabled = true;
        document.getElementById(currentId+1).disabled = false;
        document.getElementById(currentId+2).disabled = false;
        document.getElementById(currentId+3).disabled = false;
        document.getElementById(currentId+4).disabled = false;
        document.getElementById(vraagId+1).value = valueId;
    }
}
function removeValue(vraagId) {
    currentId = document.getElementById(vraagId+1).value;
    document.getElementById(currentId+1).disabled = false;
    document.getElementById(currentId+2).disabled = false;
    document.getElementById(currentId+3).disabled = false;
    document.getElementById(currentId+4).disabled = false;
    document.getElementById(vraagId+1).value = "";
    if (vraagId == 'vraag1') {
        document.getElementById('antwoord01').selected = true;
    }
    if (vraagId == 'vraag2') {
        document.getElementById('antwoord02').selected = true;
    }
    if (vraagId == 'vraag3') {
        document.getElementById('antwoord03').selected = true;
    }
    if (vraagId == 'vraag4') {
        document.getElementById('antwoord04').selected = true;
    }
}


但是现在我想添加一个系统,当所有问题都得到回答后,该系统将启用按钮。我想出了一个使用int的系统。回答问题后,它将立即添加1。未回答问题时,将删除1。但是,当我在脚本中添加int beantwoord = 0;时,会出现错误


  未捕获的ReferenceError:未定义changedValue


我怎样才能解决这个问题?

最佳答案

JavaScript是动态类型的(变量可以容纳不同类型的数据),因此以下语句将引发错误:

int someVar = 1;

而是使用var声明变量,例如

var someVar = 1;

10-05 20:37
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