第四作业（1）

<script> let div = document.querySelector("div") div.style.position = "absolute" w = parseInt(getComputedStyle(div).width) h = parseInt(getComputedStyle(div).height) div.onmousedown = function () { div.onmousemove = function (ev) { div.style.left = (ev.pageX - w / 2) + "px" div.style.top = (ev.pageY - h / 2) + "px" } } div.onmouseup = function () { div.onmousemove = null } </script>

<script> let div = document.querySelector("div") div.style.position = "absolute" w = parseInt(getComputedStyle(div).width) h = parseInt(getComputedStyle(div).height) div.onmousedown = function () { div.onmousemove = function (ev) { div.style.left = (ev.pageX - w / 2) + "px" div.style.top = (ev.pageY - h / 2) + "px" } } div.onmouseup = function () { div.onmousemove = null } </script>