需求: 使用setInterval实现div从左往右移动 1 2 3 4 5 6 7 8 9 10 11 const box = document.querySelectorAll(".box")[0]; let left = 0; function boxMoving() { if (left > 200) { clearInterval(timer); } else { left++; box.style.left = left + "px"; } } let timer = setInterval(boxMoving,