JS高程8.BOM window对象（一）

1 var age = 14;
2 window.coloer = "pink";
3 
4 console.log(delete window.age);//false 使用var语句添加的window属性的[[Configurable]]的特性的值为false，因此不能通过delete操作符删除。
5 console.log(delete window.color);//true
6 
7 console.log(window.age);//14
8 console.log(window.color);//undefined

1 var newValue = oldValue;//报错：oldValue is not defined 
2 
3 var newValue = window.oldValue;//不会报错，是一次属性查询
4 console.log(newValue);//undefined

1 var leftPos = (typeof window.screenLeft == "number" ) ? window.screenLeft : window.screenX;
2 var topPos = (typeof window.screenTop == "number" ) ? window.screenTop : window.screenY;
3 
4 console.log(leftPos,topPos);/*这里浏览器窗口位置改变，坐标也会相应的改变，在Chrome浏览器中，全屏世的坐标是(0,0)*/

1 window.moveTo(0,0);/*每刷新一次，移动到(0,0)，即屏幕左上角*/
2 window.moveBy(0,100);/*每刷新一次，向下移动100px*/
3 window.moveTo(200,300);/*每刷新一次，移动到(200,300)*/
4 window.moveBy(-50,0);/*每刷新一次，向左移动50个像素*/

 1 ar pageWidth = window.innerWidth,
 2     pageHeight = window.innerHeight;
 3 
 4 if(typeof pageWidth != "number"){
 5     if(document.compatMode == "CSS1Compat"){
 6         pageWidth = document.documentElement.clienWidth;
 7         pageHeight = document.documentElement.clienHeight;
 8     }else{
 9         pageWidth = document.body.clienWidth;
10         pageHeight = document.body.clienHeight;
11     }
12 
13 }
14 console.log(pageWidth,pageHeight);

1 window.resizeTo(100,100);
2 window.resizeBy(100,50);/*每刷新一次，宽度增加100px(向右)，高度增加50px(向下)*/