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As shownThe error reported is: cannot set property "onclick" of null at window.onload
光阴似箭催人老，日月如移越少年。
The element cannot be obtained. Set id to input
Please post the code next time;
You are using document.getElementById(), but you didn’t give the id in your HTML structure;
document.getElementById()
It is recommended to use element.getElementsByTagName(tagName)this API, this is the tag name.
element.getElementsByTagName(tagName)
![[Web front-end] Node.js quick start](https://img.php.cn/upload/course/000/000/067/662b5d34ba7c0227.png)
The element cannot be obtained. Set id to input
Please post the code next time;
You are using
document.getElementById(), but you didn’t give the id in your HTML structure;It is recommended to use
element.getElementsByTagName(tagName)this API, this is the tag name.