Question

好吧，所以我有一些javascript，基本上它从网站获得一个数学方程式，更改它以便eval()可读，然后通过eval，然后当我按下一个键时插入从eval()到inputBox的答案。我有一个问题，（例如）y +？ = 20.＆＃34; y＆＃34;从数字1-20的变化。到目前为止，代码得到了问题的答案，但是以负面形式。（例如：14 +？= 20 = -14）。所以我需要帮助删除所有＆＃34; - ＆＃34;我的回答中的人物。

代码变量：

var inputBox = where the answer is (like -14 in my case)    
var question = the question. in my case 14 + ? = 20

到目前为止的代码：

//Mathletics Level 4 with Blocks//
function showAnswer(){

var inputBox = document.getElementsByClassName("questions-input-adjustment questions-input-width-v3")[0];
var submitButton = document.getElementsByClassName('question-input-form')[0];
for (var i = 0; i < 100; i++) {
   var question = document.getElementsByClassName("questions-text-alignment whiteTextWithShadow question-size-v4")[0].innerText;
   question = question.replace('= 20', '-20')
   question = question.replace('×', '*')
   question = question.replace('=', '');
   question = question.replace('=', '');
   var answer = eval(question)
   inputBox.value = answer;

 var awnser = addbits(equasion)

var inputBox = document.getElementsByClassName("questions-input-adjustment questions-input-width-v3")[0];
var submitButton = document.getElementsByClassName('question-input-form')[0];
for (var i = 0; i < 100; i++) {
   var question = document.getElementsByClassName("questions-text-alignment")[0].innerText;
   question = question.replace('= 20', '-20')
   question = question.replace(' =', '');
   question = question.replace('×', '*')
   question = question.replace('=', '');
   inputBox.value = answer;

}

 var awnser = addbits(equasion)

document.getElementById('dashow').innerText = awnser;
 document.getElementsByClassName("questions-input-adjustment questions-input-width-v3")["0"].value = awnser;
}

 window.addEventListener("keydown", checkKeyPressed, false);

function checkKeyPressed(e) {
    if (e.keyCode == "81") {
       showAnswer()
    }
}

Answer 1

试试这个：

myanswer= myanswer.replace(/-/g,'');

它从答案中反复减去

Answer 2

你可以使用低于abs功能删除减号

          a =-3
          x=Math.abs(a);
          console.log(x)

需要替换角色但是.replace没有帮助

2 个答案: