Question

为什么我的 JavaScript 代码会自行调用

2021-08-25

58

javascript html api

我正在尝试创建一个引文生成器。一切基本正常，但有时代码会自动调用自身。

在 JavaScript 中，我使用 try and catch 来处理无法加载引文的情况。我打开了 chrome 调试工具并看到，对于错误情况，它会多次调用该函数。但我不想这样。

代码在成功加载引文后也会调用该函数。

我的代码：

const quoteEl = document.getElementById("quote");
const authorEl = document.getElementById("author");
const twitterEl = document.getElementById("twitter");
const newQuoteEl = document.getElementById("new-quote");
const quoteIconEl = document.getElementById("quote-icon");

async function getQuote() {
    const proxyUrl = "https://cors-anywhere.herokuapp.com/";
    const apiUrl = "http://api.forismatic.com/api/1.0/?method=getQuote&lang=en&format=json";
    try {
        const response = await fetch(proxyUrl + apiUrl);
        const data = await response.json();

        quoteEl.innerText = data.quoteText;

        if (data.quoteAuthor === "") {
            authorEl.innerText = "Unknown";
        } else {
            authorEl.innerText = data.quoteAuthor;
        }

        if (data.quoteText.length >= 100) {
            quoteIconEl.classList.add("quote-icon-sm");
            quoteEl.classList.add("quote-text-sm");
            authorEl.classList.add("quote-author-sm");
        } else {
            oteIconEl.classList.remove("quote-icon-sm");
            quoteEl.classList.remove("quote-text-sm");
            authorEl.classList.remove("quote-author-sm");
        }
    } catch (error) {
        getQuote()
        console.log("Oops! No quote found.\nError -", error);
    }
}

getQuote();

function postOnTwitter() {
    const twitterUrl = `https://twitter.com/intent/tweet?text=${quoteEl.innerText} - ${authorEl.innerText}`;
    window.open(twitterUrl, "_blank");
}

twitterEl.addEventListener("click", postOnTwitter);
newQuoteEl.addEventListener("click", getQuote);

* {
    /* margin: 0;
    padding: 0;
    box-sizing: border-box; */
    font-family: 'Montserrat', sans-serif;
}

main {
    width: 100%;
    min-height: 100vh;
    text-align: center;
    background-color: #ffffff;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 304 304' width='304' height='304'%3E%3Cpath fill='%23000000' fill-opacity='0.2' d='M44.1 224a5 5 0 1 1 0 2H0v-2h44.1zm160 48a5 5 0 1 1 0 2H82v-2h122.1zm57.8-46a5 5 0 1 1 0-2H304v2h-42.1zm0 16a5 5 0 1 1 0-2H304v2h-42.1zm6.2-114a5 5 0 1 1 0 2h-86.2a5 5 0 1 1 0-2h86.2zm-256-48a5 5 0 1 1 0 2H0v-2h12.1zm185.8 34a5 5 0 1 1 0-2h86.2a5 5 0 1 1 0 2h-86.2zM258 12.1a5 5 0 1 1-2 0V0h2v12.1zm-64 208a5 5 0 1 1-2 0v-54.2a5 5 0 1 1 2 0v54.2zm48-198.2V80h62v2h-64V21.9a5 5 0 1 1 2 0zm16 16V64h46v2h-48V37.9a5 5 0 1 1 2 0zm-128 96V208h16v12.1a5 5 0 1 1-2 0V210h-16v-76.1a5 5 0 1 1 2 0zm-5.9-21.9a5 5 0 1 1 0 2H114v48H85.9a5 5 0 1 1 0-2H112v-48h12.1zm-6.2 130a5 5 0 1 1 0-2H176v-74.1a5 5 0 1 1 2 0V242h-60.1zm-16-64a5 5 0 1 1 0-2H114v48h10.1a5 5 0 1 1 0 2H112v-48h-10.1zM66 284.1a5 5 0 1 1-2 0V274H50v30h-2v-32h18v12.1zM236.1 176a5 5 0 1 1 0 2H226v94h48v32h-2v-30h-48v-98h12.1zm25.8-30a5 5 0 1 1 0-2H274v44.1a5 5 0 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0 0 0 6zm-96 0a3 3 0 1 0 0-6 3 3 0 0 0 0 6zm0 16a3 3 0 1 0 0-6 3 3 0 0 0 0 6zm16-32a3 3 0 1 0 0-6 3 3 0 0 0 0 6zm96 0a3 3 0 1 0 0-6 3 3 0 0 0 0 6zm-16-64a3 3 0 1 0 0-6 3 3 0 0 0 0 6zm16-16a3 3 0 1 0 0-6 3 3 0 0 0 0 6zm-32 0a3 3 0 1 0 0-6 3 3 0 0 0 0 6zm0-16a3 3 0 1 0 0-6 3 3 0 0 0 0 6zm-16 0a3 3 0 1 0 0-6 3 3 0 0 0 0 6zm-16 0a3 3 0 1 0 0-6 3 3 0 0 0 0 6zm-16 0a3 3 0 1 0 0-6 3 3 0 0 0 0 6zM49 36a3 3 0 1 0 0-6 3 3 0 0 0 0 6zm-32 0a3 3 0 1 0 0-6 3 3 0 0 0 0 6zm32 16a3 3 0 1 0 0-6 3 3 0 0 0 0 6zM33 68a3 3 0 1 0 0-6 3 3 0 0 0 0 6zm16-48a3 3 0 1 0 0-6 3 3 0 0 0 0 6zm0 240a3 3 0 1 0 0-6 3 3 0 0 0 0 6zm16 32a3 3 0 1 0 0-6 3 3 0 0 0 0 6zm-16-64a3 3 0 1 0 0-6 3 3 0 0 0 0 6zm0 16a3 3 0 1 0 0-6 3 3 0 0 0 0 6zm-16-32a3 3 0 1 0 0-6 3 3 0 0 0 0 6zm80-176a3 3 0 1 0 0-6 3 3 0 0 0 0 6zm16 0a3 3 0 1 0 0-6 3 3 0 0 0 0 6zm-16-16a3 3 0 1 0 0-6 3 3 0 0 0 0 6zm32 48a3 3 0 1 0 0-6 3 3 0 0 0 0 6zm16-16a3 3 0 1 0 0-6 3 3 0 0 0 0 6zm0-32a3 3 0 1 0 0-6 3 3 0 0 0 0 6zm112 176a3 3 0 1 0 0-6 3 3 0 0 0 0 6zm-16 16a3 3 0 1 0 0-6 3 3 0 0 0 0 6zm0 16a3 3 0 1 0 0-6 3 3 0 0 0 0 6zm0 16a3 3 0 1 0 0-6 3 3 0 0 0 0 6zM17 180a3 3 0 1 0 0-6 3 3 0 0 0 0 6zm0 16a3 3 0 1 0 0-6 3 3 0 0 0 0 6zm0-32a3 3 0 1 0 0-6 3 3 0 0 0 0 6zm16 0a3 3 0 1 0 0-6 3 3 0 0 0 0 6zM17 84a3 3 0 1 0 0-6 3 3 0 0 0 0 6zm32 64a3 3 0 1 0 0-6 3 3 0 0 0 0 6zm16-16a3 3 0 1 0 0-6 3 3 0 0 0 0 6z'%3E%3C/path%3E%3C/svg%3E");
}

#container {
    min-height: 100vh;
}

.quote-container {
    max-width: 968px;
    border-radius: 10px;
    background: rgba(255, 255, 255, 0.5);
    box-shadow: 0 10px 10px 10px rgba(0, 0, 0, 0.2);
}

.quote-text {
    font-size: 2.75rem;
    font-weight: 700;
}

#quote-icon {
    font-size: 4rem;
}

.quote-author {
    font-size: 2rem;
    font-weight: 500;
    font-style: italic;
}

/* Dynamic Classes */
.quote-icon-sm {
    font-size: 3rem;
}

.quote-text-sm {
    font-size: 2rem;
}

.quote-author-sm {
    font-size: 1.5rem;
}

/* Media Queries */
@media (max-width: 375px) {
    .quote-text {
        font-size: 2rem;
    }

    .quote-author {
        font-size: 1.5rem;
        font-weight: 500;
        font-style: italic;
    }

    #quote-icon {
        font-size: 3rem;
    }
}

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Quote Generator</title>
    <!-- Favicon -->
    <link rel="icon" type="image/png" href="https://res.cloudinary.com/djz3p8sux/image/upload/v1629822917/image/general-purpose-favicon-dabananda-mitra_zuuv1x.png">
    <!-- FontAwesome Icons -->
    <link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.15.4/css/all.css" integrity="sha384-DyZ88mC6Up2uqS4h/KRgHuoeGwBcD4Ng9SiP4dIRy0EXTlnuz47vAwmeGwVChigm" crossorigin="anonymous">
    <!-- Bootstrap Icons -->
    <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/[email protected]/font/bootstrap-icons.css">
    <!-- Bootstrap CSS -->
    <link href="https://cdn.jsdelivr.net/npm/[email protected]/dist/css/bootstrap.min.css" rel="stylesheet" integrity="sha384-KyZXEAg3QhqLMpG8r+8fhAXLRk2vvoC2f3B09zVXn8CA5QIVfZOJ3BCsw2P0p/We" crossorigin="anonymous">
    <!-- Google Font -->
    <link rel="preconnect" href="https://fonts.googleapis.com">
    <link rel="preconnect" href="https://fonts.gstatic.com" crossorigin>
    <link href="https://fonts.googleapis.com/css2?family=Montserrat:wght@400;500;700&display=swap" rel="stylesheet">
    <!-- Custom CSS -->
    <link rel="stylesheet" href="./style.css">
</head>
<body>
    <main>
        <section class="container d-flex justify-content-center align-items-center" id="container">
            <div class="quote-container p-3" id="quote-container">
                <div class="quote-text" id="quote-text">
                    <i class="fas fa-quote-left" id="quote-icon"></i>
                    <span class="quote" id="quote"></span>
                </div>
                <div class="quote-author mt-2 mb-4">-
                    <span id="author"></span>
                </div>
                <div class="buttons d-flex justify-content-between">
                    <button class="btn btn-outline-primary" id="twitter">
                        <i class="bi bi-twitter"></i> tweet
                    </button>
                    <button class="btn btn-outline-primary" id="new-quote">
                        New Quote
                    </button>
                </div>
            </div>
        </section>
    </main>
    <!-- Bootstrap JavaScript -->
    <script src="https://cdn.jsdelivr.net/npm/[email protected]/dist/js/bootstrap.bundle.min.js" integrity="sha384-U1DAWAznBHeqEIlVSCgzq+c9gqGAJn5c/t99JyeKa9xxaYpSvHU5awsuZVVFIhvj" crossorigin="anonymous"></script>
    <!-- Custom JavaScript -->
    <script src="./script.js"></script>
</body>
</html>

我该如何解决这个问题？

Answer 1

在代码的开头，你调用的是 getQuote() 。

然后，如果你遇到错误，它也会调用 getQuote() 方法。但是，如果你总是遇到问题，它就会一直循环。

我建议你打印错误，并尝试阻止/修复它，或者只是删除错误子句中的 getQuote() 。

最后，你可以只打印错误，然后在调用 get quote 方法之后，始终显示错误，然后再次运行该方法。

Answer 2

您的代码不断调用自身，因为提取调用返回失败响应。

"Missing required request header. Must specify one of: origin,x-requested-with"

并且您尝试使用 response.json()

对其进行解析>

这会强制您的代码转到 catch 块，您再次调用 getQuote() 方法。一个好的做法是至少限制重试次数，这样您的应用程序就不会冻结。