這個數組是如何工作的？

Question

只是一個簡單的JavaScript測驗。下面的代碼工作，但我有幾個關於它的問題。

var player = prompt("Hello, welcome to the quiz, what is your name?"); 
var score = 0; 

var questions = [ 
    ["What is my name?", "Joe"], 
    ["What is my age?", 27], 
    ["What is my favourite sport?", "Football"], 
    ["What is my job?", "Web Developer"], 
    ["What is my eye color?", "Blue"] 
]; 

function askQuestions(question) { 
var answer = prompt(question[0],''); 
if(answer === question[1]) { 
    alert('Correct!') 
} else { 
    alert('Wrong!'); 
} 
}; 

for(var i= 0; i < questions.length; i++) { 
    askQuestions(questions[i]); 
}; 

所以我不明白的第一件事是在askQuestions函數中提示符有'questions [0]'。我知道我們有一個循環，但這不是循環的一部分嗎？所以肯定這個變量只是將第一個數組存儲在questions變量中。

第二個參數是一個空字符串''。這只是存儲答案嗎？這是如何運作的？

我明白休息只是有問題的功能。

如果有人能解釋這將是偉大的！

乾杯

Answer 1

var questions是2D陣列的陣列，並且每個這些2D陣列的在循環到askQuestion通過。然後，例如，當您在第一個循環中傳遞question [0]以詢問Question時，您確實傳遞了對象['我的名字是什麼'，'Joe']

函數內部函數askQuestion然後參數數組的第一個元素（所以，'我的名字是什麼'），並將答案與參數數組的第二個元素進行比較（所以，'喬'）

也許，如果你寫這樣askQuestion，你會明白更多工作流程：

function askQuestions(**paramArray**) { 
    var answer = prompt(**paramArray**[0],''); 
    if(answer === **paramArray**[1]) { 
    alert('Correct!') 
    } else { 
    alert('Wrong!'); 
    } 
}; 

關於提示，第二個參數它只是默認顯示的文本。

Answer 2

因此，最好的方法來看看發生了什麼，只需把變量，並插入自己。

askQuestions（問題[我]）

插頭在I：

askQuestions（問題[0]）

塞問題[0]

askQuestions （ [「我的名字是什麼？」，「喬」] ）

插件功能

function askQuestions(["What is my name?", "Joe"]) { 
var answer = prompt("What is my name?",''); 
if(answer === "Joe") { 
    alert('Correct!') 
} else { 
    alert('Wrong!'); 
} 
}; 

我評論這裏的代碼：

//player inputs their name and it is stored in var player 
var player = prompt("Hello, welcome to the quiz, what is your name?"); 
//set var score to 0; 
var score = 0; 

//questions is an array, of arrays. so questions[0] is ["What is my name?", "Joe"] and questions[0][0] is "What is my name?" 
var questions = [ 
["What is my name?", "Joe"], 
["What is my age?", 27], 
["What is my favourite sport?", "Football"], 
["What is my job?", "Web Developer"], 
["What is my eye color?", "Blue"] 
]; 

//askQuestions is a function that will be called in the for loop below 
function askQuestions(question) { 
//set var answer to whatever the user types in, pop up will say whatever question[0] is Or in this case question[i][0] because we pass in question[i] 
var answer = prompt(question[0],''); 
//here we just check if what they type in is the same as the answer we expect 
if(answer === question[1]) { 
alert('Correct!') 
} else { 
    alert('Wrong!'); 
} 
}; 

//this loop is going to to run for the questions.length, in this case 5 times, and each time it will call askQuestions(question[0]) then askQuestions(question[1]) etc 
for(var i= 0; i < questions.length; i++) { 
    askQuestions(questions[i]); 
}; 

希望幫助... :)