为什么我的 javascript 重定向不起作用“”？

Question

Why doesn't the redirectFunction() function redirect to another link?

 document.querySelectorAll(".redirectBtn") .addEventListener("click", redirectFunction); function redirectFunction() { window.location.href = ("https://stackoverflow.com/questions/29475323/call-function-with-classname-onclick-js/29475365"); }

 <h1>Redirect to a Webpage Example</h1> <button class="redirectBtn">Redirect</button> <h2>Click the above button to Redirect to another Webpage</h2>

Answer 1

You need to use querySelector instead of querySelectorAll . querySelectorAll returns a list of dom elements on which you can't invoke the addEventListener method.

 document.querySelector(".redirectBtn") .addEventListener("click", redirectFunction); function redirectFunction() { window.location.href = ("https://stackoverflow.com/questions/29475323/call-function-with-classname-onclick-js/29475365"); }

 <h1>Redirect to a Webpage Example</h1> <button class="redirectBtn">Redirect</button> <h2>Click the above button to Redirect to another Webpage</h2>

Answer 2

Note: querySelectorAll always return an array. You cannot add event listener to an array. Loop through the nodes and add event listener on individual node.

 document.querySelectorAll(".redirectBtn").forEach((node) => node.addEventListener("click", redirectFunction)) function redirectFunction() { window.location.href = ("https://stackoverflow.com/questions/29475323/call-function-with-classname-onclick-js/29475365"); }

 <h1>Redirect to a Webpage Example</h1> <button class="redirectBtn">Redirect</button> <h2>Click the above button to Redirect to another Webpage</h2>

Answer 3

querySelectorAll返回一个节点集合，您必须使用循环添加eventListener或者您可以像这样使用querySelector

document.querySelector(".redirectBtn").addEventListener("click", redirectFunction);

Answer 4

Because querySelectorAll returns an array of elements that matches the query. Since you only have one element, with that query, you need to use querySelector , which only selects one (1st) element.

 document.querySelector(".redirectBtn") .addEventListener("click", redirectFunction); function redirectFunction() { window.location.href = ("https://stackoverflow.com/questions/29475323/call-function-with-classname-onclick-js/29475365"); }

 <h1>Redirect to a Webpage Example</h1> <button class="redirectBtn">Redirect</button> <h2>Click the above button to Redirect to another Webpage</h2>

Answer 5

there is a space here:

you have to remove it

document.querySelector(".redirectBtn")XXXXXXXXXXXXXXXXXXXXX.addEventListener("click", redirectFunction);