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我有兩個選項卡部分，我希望默認選擇每個選項卡部分的第一個選項卡。在這種情況下，選項卡1和選項卡4。我怎樣才能做到這一點？如何選擇選項卡1和選項
在我的嘗試中，我創建了一個按類名選擇的循環，但我注意到只有循環中的最後一個元素總是被選中而不是全部。我沒有列入，因爲我認爲問題是一次只能選擇一個標籤，但我不明白這個陳述在哪裏。
一星期前剛剛拿起js。這是我從w3schools獲得的一個修改示例。
<!DOCTYPE html>
<html>
<head>
<style>
body {font-family: "Lato", sans-serif;}
/* Style the tab */
div.tab {
overflow: hidden;
border: 1px solid #ccc;
background-color: #f1f1f1;
}
/* Style the buttons inside the tab */
div.tab button {
background-color: inherit;
float: left;
border: none;
outline: none;
cursor: pointer;
padding: 14px 16px;
transition: 0.3s;
font-size: 17px;
}
/* Change background color of buttons on hover */
div.tab button:hover {
background-color: #ddd;
}
/* Create an active/current tablink class */
div.tab button.active {
background-color: #ccc;
}
/* Style the tab content */
.tabcontent {
display: none;
padding: 6px 12px;
border: 1px solid #ccc;
border-top: none;
}
/* Style the close button */
.topright {
float: right;
cursor: pointer;
font-size: 20px;
}
.topright:hover {color: red;}
</style>
</head>
<body>
<p>Click on the x button in the top right corner to close the current tab:</p>
<div class="tab">
<button class="tablinks" onclick="openCity(event, 'London')" id="defaultOpen1">London</button>
<button class="tablinks" onclick="openCity(event, 'Paris')">Paris</button>
<button class="tablinks" onclick="openCity(event, 'Tokyo')">Tokyo</button>
</div>
<div id="London" class="tabcontent">
<span onclick="this.parentElement.style.display='none'" class="topright">x</span>
<h3>London</h3>
<p>London is the capital city of England.</p>
</div>
<div id="Paris" class="tabcontent">
<span onclick="this.parentElement.style.display='none'" class="topright">x</span>
<h3>Paris</h3>
<p>Paris is the capital of France.</p>
</div>
<div id="Tokyo" class="tabcontent">
<span onclick="this.parentElement.style.display='none'" class="topright">x</span>
<h3>Tokyo</h3>
<p>Tokyo is the capital of Japan.</p>
</div>
<p>Click on the x button in the top right corner to close the current tab:</p>
<div class="tab">
<button class="tablinks" onclick="openCity(event, '1')" id="defaultOpen2">1</button>
<button class="tablinks" onclick="openCity(event, '2')">2</button>
<button class="tablinks" onclick="openCity(event, '3')">3</button>
</div>
<div id="1" class="tabcontent">
<span onclick="this.parentElement.style.display='none'" class="topright">x</span>
<h3>London</h3>
<p>London is the capital city of England.</p>
</div>
<div id="2" class="tabcontent">
<span onclick="this.parentElement.style.display='none'" class="topright">x</span>
<h3>Paris</h3>
<p>Paris is the capital of France.</p>
</div>
<div id="3" class="tabcontent">
<span onclick="this.parentElement.style.display='none'" class="topright">x</span>
<h3>Tokyo</h3>
<p>Tokyo is the capital of Japan.</p>
</div>
<script>
function openCity(evt, cityName) {
var i, tabcontent, tablinks;
tabcontent = document.getElementsByClassName("tabcontent");
for (i = 0; i < tabcontent.length; i++) {
tabcontent[i].style.display = "none";
}
tablinks = document.getElementsByClassName("tablinks");
for (i = 0; i < tablinks.length; i++) {
tablinks[i].className = tablinks[i].className.replace(" active", "");
}
document.getElementById(cityName).style.display = "block";
evt.currentTarget.className += " active";
}
// Get the element with id="defaultOpen" and click on it
document.getElementById("defaultOpen1").click();
document.getElementById("defaultOpen2").click();
</script>
</body>
</html>
沒有標籤4 ..第一部分只有3個標籤，第二部分只有3個標籤！ –
對不起。我的意思是默認打開每個部分的第一個選項卡。 – user3085351