<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <meta http-equiv ...
btn.onclick=async function(){ for(let i=0;i<box.length;i++){ await fn(box[i]) } }
function fn(el){ return new Promise((resolve,reject)=>{ el.style.transform=`translateX(0)`; el.addEventListener("transitionend",function(){ resolve();//為什麼調用這個成功函數 }) }) }
</script> </body> </html>
