代码示例:(标识:jsck_win_moveby)
<!DOCTYPE html>
<html>
<body>

<h1>Window 对象</h1>

<h2>moveBy() 方法</h2>

<p>打开 "myWindow" 并将新窗口相对于当前位置移动 250px:</p>

<button onclick="openWin()">打开 "myWindow"</button>
<button onclick="moveWin()">移动 "myWindow"</button>

<script>
let myWindow;

function openWin() {
  myWindow = window.open("", "", "width=400, height=400");
}

function moveWin() {
  myWindow.moveBy(250, 250);
}
</script>

</body>
</html>
运行结果: