How can I count mouse scroll using pure JS?
Example:
default value: 0
scroll down: ++1
scroll up: --1
我试着用deltaY
和一个switch 盒
let mouseWheel = 0;
switch (deltaY) {
case 100:
if (mouseWheel > 0) {
mouseWheel += 1;
} else if (mouseWheel < 0) {
mouseWheel = 0;
}
break;
case -100:
if (mouseWheel > 0) {
mouseWheel -= 1;
} else if (mouseWheel < 0) {
mouseWheel = 0;
}
break;
default:
break;
}