​x
 
<!DOCTYPE html>
<html>
<head>
<script>
function openWin() {
  var myWindow = window.open("", "", "width=400, height=200");
  myWindow.opener.document.getElementById("demo").innerHTML = 
  "已经打开一个新窗口。";
}
</script>
</head>
<body>
​
<button onclick="openWin()">打开 myWindow</button>
​
<p id="demo"></p>
​
</body>
</html>
​