財產 '的addEventListener' 我有一些JavaScript代碼,讓這個錯誤爲什麼顯示這個錯誤遺漏的類型錯誤:無法讀取的不確定
Uncaught TypeError: Cannot read property 'addEventListener' of undefined
我的代碼:
HTML:
<div class="main">
<h1 id="our-heading">The page heading</h1>
<button id="button">Add Item</button>
<ul id="our-list">
<li>Item one</li>
<li>Item two</li>
<li>Item three</li>
<li>Item four</li>
<li>Item five</li>
</ul>
</div>
Javascript:
var ourHeadline = document.getElementById("our-heading");
var listItems = document.getElementById("our-list").getElementsByTagName("li");
for (var i = 0; i<= listItems.length; i++){
listItems[i].addEventListener("click", activateItem);
}
function activateItem(){
ourHeadline.innerHTML = this.innerHTML;
}
請人給我的解決方案
你可以顯示HTML嗎? –
HTML代碼上面 –