[英]This JavaScript code is not working. Have I got the syntax wrong or is it something else?
這段代碼沒有像我希望的那樣工作，但我不確定是什么問題。
代碼：
<body>
var randNumForQuote = Math.floor((Math.random() * 11));
if (randNumForQuote == 0) {
document.getElementById("quoteDiv").innerHTML = "Hello";
} else if (randNumForQuote == 1) {
document.getElementById("quoteDiv").innerHTML = "Hello1";
} else if (randNumForQuote == 2) {
document.getElementById("quoteDiv").innerHTML = "Hello2";
} else if (randNumForQuote == 3) {
document.getElementById("quoteDiv").innerHTML = "Hello3";
} else if (randNumForQuote == 4) {
document.getElementById("quoteDiv").innerHTML = "Hello4";
} else if (randNumForQuote == 5) {
document.getElementById("quoteDiv").innerHTML = "Hello5";
} else if (randNumForQuote == 6) {
document.getElementById("quoteDiv").innerHTML = "Hello6";
} else if (randNumForQuote == 7) {
document.getElementById("quoteDiv").innerHTML = "Hello7";
} else if (randNumForQuote == 8) {
document.getElementById("quoteDiv").innerHTML = "Hello8";
} else if (randNumForQuote == 9) {
document.getElementById("quoteDiv").innerHTML = "Hello9";
} else if (randNumForQuote == 10) {
document.getElementById("quoteDiv").innerHTML = "Hello10";
}
<div id="quoteDiv"></div>
</body>
我對 JavaScript 的經驗有限，所以不太了解這個問題。
我期待 div 說出輸出之一（例如， Hello, Hello1, Hello2, etc. ）
您需要將 JavaScript 代碼放在script標簽中，並在頁面加載后運行代碼，因此放在window.onload回調中，該回調在文檔加載過程結束時觸發。
<body> <script> window.onload = function() { var randNumForQuote = Math.floor((Math.random() * 11)); if (randNumForQuote == 0) { document.getElementById("quoteDiv").innerHTML = "Hello"; } else if (randNumForQuote == 1) { document.getElementById("quoteDiv").innerHTML = "Hello1"; } else if (randNumForQuote == 2) { document.getElementById("quoteDiv").innerHTML = "Hello2"; } else if (randNumForQuote == 3) { document.getElementById("quoteDiv").innerHTML = "Hello3"; } else if (randNumForQuote == 4) { document.getElementById("quoteDiv").innerHTML = "Hello4"; } else if (randNumForQuote == 5) { document.getElementById("quoteDiv").innerHTML = "Hello5"; } else if (randNumForQuote == 6) { document.getElementById("quoteDiv").innerHTML = "Hello6"; } else if (randNumForQuote == 7) { document.getElementById("quoteDiv").innerHTML = "Hello7"; } else if (randNumForQuote == 8) { document.getElementById("quoteDiv").innerHTML = "Hello8"; } else if (randNumForQuote == 9) { document.getElementById("quoteDiv").innerHTML = "Hello9"; } else if (randNumForQuote == 10) { document.getElementById("quoteDiv").innerHTML = "Hello10"; } } </script> <div id="quoteDiv"></div> </body>
雖然你可以減少代碼
<body> <script> window.onload = function() { var randNumForQuote = Math.floor((Math.random() * 11)); document.getElementById("quoteDiv").innerHTML = "Hello" + (randNumForQuote ? " " + randNumForQuote : ''); } </script> <div id="quoteDiv"></div> </body>
Javascript 需要在腳本標簽中，如果它在 html 中，並且你需要讓 div 出現在腳本標簽之前。
<body> <div id="quoteDiv"></div> <script> var randNumForQuote = Math.floor((Math.random() * 11)); if (randNumForQuote == 0) { document.getElementById("quoteDiv").innerHTML = "Hello"; } else if (randNumForQuote == 1) { document.getElementById("quoteDiv").innerHTML = "Hello1"; } else if (randNumForQuote == 2) { document.getElementById("quoteDiv").innerHTML = "Hello2"; } else if (randNumForQuote == 3) { document.getElementById("quoteDiv").innerHTML = "Hello3"; } else if (randNumForQuote == 4) { document.getElementById("quoteDiv").innerHTML = "Hello4"; } else if (randNumForQuote == 5) { document.getElementById("quoteDiv").innerHTML = "Hello5"; } else if (randNumForQuote == 6) { document.getElementById("quoteDiv").innerHTML = "Hello6"; } else if (randNumForQuote == 7) { document.getElementById("quoteDiv").innerHTML = "Hello7"; } else if (randNumForQuote == 8) { document.getElementById("quoteDiv").innerHTML = "Hello8"; } else if (randNumForQuote == 9) { document.getElementById("quoteDiv").innerHTML = "Hello9"; } else if (randNumForQuote == 10) { document.getElementById("quoteDiv").innerHTML = "Hello10"; } </script> </body>
<html>
<body>
<div id="quoteDiv"></div>
</body>
<script>
// self executing function here
var randNumForQuote = Math.floor((Math.random() * 11));
if (randNumForQuote == 0) {
document.getElementById("quoteDiv").innerHTML = "Hello";
} else if (randNumForQuote == 1) {
document.getElementById("quoteDiv").innerHTML = "Hello1";
} else if (randNumForQuote == 2) {
document.getElementById("quoteDiv").innerHTML = "Hello2";
} else if (randNumForQuote == 3) {
document.getElementById("quoteDiv").innerHTML = "Hello3";
} else if (randNumForQuote == 4) {
document.getElementById("quoteDiv").innerHTML = "Hello4";
} else if (randNumForQuote == 5) {
document.getElementById("quoteDiv").innerHTML = "Hello5";
} else if (randNumForQuote == 6) {
document.getElementById("quoteDiv").innerHTML = "Hello6";
} else if (randNumForQuote == 7) {
document.getElementById("quoteDiv").innerHTML = "Hello7";
} else if (randNumForQuote == 8) {
document.getElementById("quoteDiv").innerHTML = "Hello8";
} else if (randNumForQuote == 9) {
document.getElementById("quoteDiv").innerHTML = "Hello9";
} else if (randNumForQuote == 10) {
document.getElementById("quoteDiv").innerHTML = "Hello10";
}
</script>
</html>
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