我是JavaScript的初學者,有人能幫我解釋我的腳本有什麼問題。我試圖讓所有在亞洲的國家以字母'b'開頭。以下是我的html文檔。以下文件顯示亞洲所有以警示框中的字母'b'開頭的國家。getElementsByClassName不起作用
<!DOCTYPE html>
<html>
<head>
<title>Get Element By class name</title>
</head>
<body>
<p id="countriesInAsia">
<h1>Countries in Asia</h1>
<ol class = "a">
<li>India</li>
<li>Indonesia</li>
<li>Iran</li>
<li>Iraq</li>
<li>Israel</li>
</ol>
<ol class = "b">
<li>Bahrain</li>
<li>Bangladesh</li>
<li>Bhutan</li>
<li>Brunei</li>
</ol>
</p>
<p id="countriesInEurope">
<h1>Countries in Europe</h1>
<ol class = "a">
<li>Albania</li>
<li>Andorra</li>
<li>Armenia</li>
<li>Austria</li>
<li>Azerbaijan</li>
</ol>
<ol class = "b">
<li>Belarus</li>
<li>Belgium</li>
<li>Bosnia and Herzegovina</li>
<li>Bulgaria</li>
</ol>
</p>
<script>
var countriesInAsia = document.getElementById("countriesInAsia");
var countries = countriesInAsia.getElementsByClassName("b");
var message = "Countries in Asia starts with alphabet b are : ";
for(var i = 0; i < countries.length; i++){
message = message + countries[i].textContent;
}
alert(message);
</script>
</body>
</html>
不要到從啓動。你選擇的是「OL」而不是「LI」。嘗試獲取'OL'的所有孩子並對其進行迭代。 –
同意,但textContent應給出給定元素ri8中的所有文本內容? –