var box;
window.onload=function () {
box=document.getElementById("box");
}
function aa () {
box.style.height="400px";
}
Is there any problem if the above code is replaced with the following code?
var box=document.getElementById("box");
function aa () {
box.style.height="400px";
}
![[Web front-end] Node.js quick start](https://img.php.cn/upload/course/000/000/067/662b5d34ba7c0227.png)
