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目標:
從輸入框中檢索值,而不是在javascript中對文本「item2」進行硬編碼。檢索沒有硬編碼id名稱的值
問題:
可以做到嗎?如果是,如何?
<p>Example list:</p>
<input id="test" value="item2">
<ul><li id="item1">Coffee (first li)</li><li id="item2">Tea (second li)</li></ul>
<p>Click the button to get the HTML content of the previous sibling of the second list item.</p>
<button onclick="myFunction()">Try it</button>
<p><strong>Note:</strong> Whitespace inside elements is considered as text, and text
is considered as nodes.</p>
<p>If you add whitespace between the two li elements, the result will be "undefined".</p>
<p id="demo"></p>
<script>
function myFunction() {
var x = document.getElementById("item2").previousSibling.innerHTML;
document.getElementById("demo").innerHTML = x;
}
</script>
什麼是你想達到什麼目的? –
https://jsfiddle.net/2q7fwvq2/1/喜歡這個嗎? –
是的,很難理解。 –