javascript - 无法检测到二维数组

var exercise= [
     ['What is the first name of our professor in this course?', 'cecilia'],
     ['What is the last name of our prof in this coursrs?', 'chan'],
     ['Which language is the most popular one in the world?', 'javascript']
];

var player_ans;
var correct_num=0;
for(var i=0; i<exercise.length; i++){
     player_ans= prompt(exercise[i][0]);
     if(player_ans.toLowerCase === exercise[i][1]){
        correct_num+= 1;
     }
}
document.write('The number of question you answered correctly is '+ correct_num);

在我正确回答所有问题后，我希望correct_num的值为3。但是，屏幕上显示的correct_num的值仍为0 ...非常感谢您的帮助。谢谢。

最佳答案

toLowerCase是一个函数，因此将其用作toLowerCase()

var exercise= [
             ['What is the first name of our professor in this course?', 'cecilia'],
              ['What is the last name of our prof in this coursrs?', 'chan'],
              ['Which language is the most popular one in the world?', 'javascript']
];
var player_ans;
var correct_num=0;
    for(var i=0; i<exercise.length; i++){
       player_ans= prompt(exercise[i][0]);

       if(player_ans.toLowerCase() === exercise[i][1])
         { correct_num+= 1;
         console.log(player_ans)
          }
     }
 document.write('The number of question you answered correctly is '+ correct_num);

关于javascript - 无法检测到二维数组，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/56885529/