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在 java 腳本中將數組寫入元素時出現未知錯誤？

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qq_笑_17 2022-09-16 21:00:46

我希望向 div 中添加一個數組。不適用于。我能夠使用將數組寫入 DOM。這是整個網頁document.getElementsByClassName('boxed').innerHTML = numListdocument.write(numList)<!DOCTYPE html><html><head><title>Super Lotto</title><meta charset="utf-8"><link href="https://fonts.googleapis.com/css?family=Libre+Franklin" rel="stylesheet"><link href="lotto-styles.css" rel="stylesheet"><script> do { var high = prompt('What\'s the highest number you want to generate',''); high = parseInt(high, 10); } while (isNaN(high)); do { var nums = prompt('How many numbers do you want to generate',''); nums = parseInt(nums, 10); } while (isNaN(nums)); function rand(highestNum) { var randomNumber = Math.floor(Math.random() * highestNum) + 1; return randomNumber; } var numList = []; for (var i = 0; i < nums; i++) { // Go through this loop quantity of times numList.unshift(rand(high)); // add new number to end of array }; numList.toString(); document.getElementsByClassName('boxed').innerHTML = numList;</script></head><body><div id="container"> <header> <h1>Lucky Numbers</h1> </header> <main> <div class="boxed"></div> <p>Good luck!</p> </main></div> </body></html>

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2 回答

紫衣仙女

TA貢獻1839條經驗獲得超15個贊

你的問題是，在innerHTML中，你不能添加一個數組，只是一個字符串，來添加你需要做的數字，比如，我修改了你的代碼來做到這一點。我改變的另一件事是，我沒有使用“盒裝”作為類，而是使用它作為id，因為getElementsByClassName返回一個節點列表。numList.join(" ");

do {

var high = prompt('What\'s the highest number you want to generate','');

high = parseInt(high, 10);

} while (isNaN(high));

do {

var nums = prompt('How many numbers do you want to generate','');

nums = parseInt(nums, 10);

} while (isNaN(nums));

function rand(highestNum) {

var randomNumber =

Math.floor(Math.random() * highestNum) + 1;

return randomNumber;

}

var numList = [];

for (var i = 0; i < nums; i++) {

// Go through this loop quantity of times

numList.unshift(rand(high));

// add new number to end of array

};

numList.toString();

document.getElementById('boxed').innerHTML = numList.join(" ");

<h1>Lucky Numbers</h1>

</header>

<main>

</main>

</div>

反對回復 2022-09-16

慕田峪7331174

TA貢獻1828條經驗獲得超13個贊

當你通過類名（來源：https://developer.mozilla.org/fr/docs/Web/API/Document/getElementsByClassName）獲取元素時，你會收到一個數組，所以你必須精確你想要數組的哪個元素，我認為[0]在你的情況下。如果您只有一個放置結果的位置，則最好使用ID，如下所示：

do {

var high = prompt('What\'s the highest number you want to generate','');

high = parseInt(high, 10);

} while (isNaN(high));

do {

var nums = prompt('How many numbers do you want to generate','');

nums = parseInt(nums, 10);

} while (isNaN(nums));

function rand(highestNum) {

var randomNumber =

Math.floor(Math.random() * highestNum) + 1;

return randomNumber;

}

var numList = [];

for (var i = 0; i < nums; i++) {

// Go through this loop quantity of times

numList.unshift(rand(high));

// add new number to end of array

console.log(numList)

};

numList.toString();

document.getElementById('boxed').innerHTML = numList;

<!DOCTYPE html>

<html>

<head>

<title>Super Lotto</title>

</head>

<body>

<h1>Lucky Numbers</h1>

</header>

<main>

</main>

</div>

</body>

</html>

反對回復 2022-09-16

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在 java 腳本中將數組寫入元素時出現未知錯誤？