<!DOCTYPE html>
<html>
<head>
<script>
var myWindow;
function openWin() { myWindow = window.open("", "", "width=400 ,height=200");}
function closeWin() { if (myWindow) { myWindow.close();
}
}
function checkWin() { msg = ""
if (!myWindow) { msg = "was never opened";
} else { if (myWindow.closed) { msg = "is closed";
} else { msg = "is open";
}
}
document.getElementById("msg").innerHTML = "myWindow " + msg;
}
</script>
</head>
<body>
<button onclick="openWin()">打开 myWindow</button>
<button onclick="closeWin()">关闭 myWindow</button>
<button onclick="checkWin()">myWindow 打开了吗？</button>
<br><br>
<div id="msg"></div>
</body>
</html>