正确的方法是使用单个计时器。使用setInterval，您可以实现所需的目标，如下所示：
window.onload = function start() {
slide();
}
function slide() {
var num = 0, style = document.getElementById('container').style;
window.setInterval(function () {
// increase by num 1, reset to 0 at 4
num = (num + 1) % 4;
// -600 * 1 = -600, -600 * 2 = -1200, etc
style.marginLeft = (-600 * num) + "px";
}, 3000); // repeat forever, polling every 3 seconds
}
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