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``` <style> #box { width: 100px; height: 100px; background-color: skyblue; position: relative; } </style> </head> <body> <input type="button" id="btn" value="开始"> <div id="box"></div> <script> var btn = document.getElementById('btn'); var box = document.getElementById('box'); btn.onclick = function () { var timerId = setInterval(function () { if (box.offsetLeft >= 500) { clearInterval(timerId); return; } box.style.left = box.offsetLeft + 1 + 'px'; }, 100); }; </script> ```