Learn BOM knowledge

BOM - Browser Object Model - (browser object model)

https://www.w3school.com.cn/js/js_window.asp

• First taste of the powerful BOM

  // 浏览器中运行
  var value = confirm('你真的忍心离开我吗?');
  if (value) {
      // 关闭当前窗口
      close();
  } else {
      alert('你还是爱我的');
  }

• BOM primary browser window and frame processing, a method of interacting with the browser and the interface

• Javascript can be accessed by visiting the BOM objects, control, modify browser

• BOM and DOM relationship

  • BOM contains the DOM, the browser provides access to a BOM give out the object, and then accessed from the BOM object to the DOM object, which can be operated js browsers and browser to read the document

    BOM {
      Window { // Javascript层级中的顶层对象,表示浏览器窗口
        Document {}
      }
      Navigator, ( 包含浏览器的信息 )
      History, ( 包含浏览器访问过的url )
      Location, ( 包含当前URL的信息 )
      Screen, ( 包含客户端显示屏的信息, Javascript可以利用这些信息来优化输出,以达到用户的显示要求 )
    }