用js小类库获取浏览器的高度和宽度信息

var Browser = {
};
//页面
Browser.Page = (function () {
return {
scrollTop: function () {
return Math.max(document.body.scrollTop, document.documentElement.scrollTop);
},
scrollLeft: function () {
return Math.max(document.body.scrollLeft, document.documentElement.scrollLeft);
},
height: function () {
var _height;
if (document.compatMode == "CSS1Compat") {
_height = document.documentElement.scrollHeight;
} else {
_height = document.body.scrollHeight;
}
return _height;
},
width: function () {
var _width;
if (document.compatMode == "CSS1Compat") {
_width = document.documentElement.scrollWidth;
} else {
_width = document.body.scrollWidth;
}
return _width;
}
};
})();
//窗口：
Browser.Window = (function () {
return {
outerHeight: function () {
var _hei = window.outerHeight;
if (typeof _hei != "number") {
_hei = Browser.ViewPort.outerHeight();
}
return _hei;
},
outerWidth: function () {
var _wid = window.outerWidth;
if (typeof _wid != "number") {
_wid = Browser.ViewPort.outerWidth();
}
return _wid;
},
innerHeight: function () {
var _hei = window.innerHeight;
if (typeof _hel != "number") {
_hei = Browser.ViewPort.innerHeight();
}
return _hei;
},
innerWidth: function () {
var _wid = window.innerWidth;
if (typeof _wid != "number") {
_wid = Browser.ViewPort.innerWidth();
}
return _wid;
},
height: function () {
return Browser.Window.innerHeight();
},
width: function () {
return Browser.Window.innerWidth();
}
}
})();
//视口:
Browser.ViewPort = (function () {
return {
innerHeight: function () {
var _height;
if (document.compatMode == "CSS1Compat") {
_height = document.documentElement.clientHeight;
} else {
_height = document.body.clientHeight;
}
return _height;
},
innerWidth: function () {
var _width;
if (document.compatMode == "CSS1Compat") {
_width = document.documentElement.clientWidth;
} else {
_width = document.body.clientWidth;
}
return _width;
},
outerHeight: function () {
var _height;
if (document.compatMode == "CSS1Compat") {
_height = document.documentElement.offsetHeight;
} else {
_height = document.body.offsetHeight;
}
return _height;
},
outerWidth: function () {
var _width;
if (document.compatMode == "CSS1Compat") {
_width = document.documentElement.offsetWidth;
} else {
_width = document.body.offsetWidth;
}
return _width;
},
width: function () {
return Browser.ViewPort.innerWidth();
},
height: function () {
return Browser.ViewPort.innerHeight();
}
}
})();

window.onload = window.onresize = function () {
var top = Math.round(Browser.Page.scrollTop() + (Browser.ViewPort.height() / 2) - (parseInt(document.getElementById("divCenter").style.height) / 2));
var left = Math.round(Browser.Page.scrollLeft() + (Browser.ViewPort.width() / 2) - (parseInt(document.getElementById("divCenter").style.width) / 2));
document.getElementById("divCenter").style.top = top + "px";
document.getElementById("divCenter").style.left = left + "px";
}