Window closed 属性

定义和用法

如果窗口关闭，则 closed 属性返回 true。

closed 属性是只读的。

实例

检查窗口是否关闭的函数：

function checkWin() {
  if (!myWindow) {
    text = "It has never been opened!";
  } else {
    if (myWindow.closed) {
      text = "It is closed.";
    } else {
      text = "It is open.";
    }
  }
}

亲自试一试

语法

window.closed

返回值

浏览器支持

所有浏览器都支持 window.closed：