JavaScript使用随机数对每个方程式使用Select运算符使用随机数生成问题

Question

我想做一个数学游戏，随机生成数字和运算符。

这是提示- x = Math.floor(Math.random()*101);将生成一个0到100之间的随机数。(+,*,-)为每个方程式随机选择运算符。请任何人可以帮助我。

var arr = []
while(arr.length < 8){
    var r = Math.floor(Math.random()*100) + 1;
    if(arr.indexOf(r) === -1) arr.push(r);
}
document.write(arr);

Answer 1

这是ES6的实现，我console.log代替了document.write

let questionsCount = 10;

function generateQuestions() {
    let questions = []; 

    for(let i = 0;i < questionsCount;i++) {
      let n1 = Math.floor(Math.random() * 101);
      let n2 = Math.floor(Math.random() * 101);
      let operatorObj = randomOperator(n1,n2)
      questions.push({
         question: `${n1} ${operatorObj.operator} ${n2} ?`,
         answer: operatorObj.answer
      });
    }

    return questions;
}




 function randomOperator(n1,n2) {
    let n = Math.floor(Math.random() * 4);
    switch (n) {
       case 0: 
         return {operator: '+', answer: n1 + n2};
       case 1:
         return {operator: '-', answer: n1 - n2}
       case 2:
         return {operator: '*', answer: n1 * n2}
       case 3:
         return {operator: '/', answer: n1 / n2}
    }
 }

let questions = generateQuestions();

let answers = questions.map((question) => 
     prompt(question.question));

answers.forEach((answer,i) => {
    console.log(`${questions[i].question} ${answer} ${(answer == 
       questions[i].answer) ? 'Correct': `Wrong should be 
       ${questions[i].answer}`}`)
});