深入淺出之javascript腳本編程第三十七課lesson

1、= = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = =黑鷹安全網(wǎng)中國(guó)最大的資訊門戶站多抽出一分鐘時(shí)間學(xué)習(xí).讓你的生命更加.動(dòng)畫只是起到技術(shù)交流作用.請(qǐng)大家不用利用此方法對(duì)國(guó)內(nèi)的網(wǎng)絡(luò)做破壞.國(guó)人應(yīng)該團(tuán)結(jié)起來一致對(duì)外才是的責(zé)任.由此動(dòng)畫造成的任何和本站無關(guān).= = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = =深入淺出之 JavaScript編程第三十七課（scre

2、en 對(duì)象）動(dòng)畫作者：技術(shù)個(gè)人主頁：測(cè)試環(huán)境：聯(lián)系技術(shù)郵箱：Windows Xp Profesal Sp3工具：IIS 5.1 安裝包,系統(tǒng)記事本程序本節(jié)內(nèi)容綱要：1、JavaScript 獲取屏幕的【可用】高度2、JavaScript 獲取屏幕的可用寬度3、JavaScript 獲取調(diào)色板比特深度4、JavaScript 獲取屏幕每英寸垂直點(diǎn)數(shù)和水平點(diǎn)數(shù)5、JavaScript 判斷是否啟用字體平滑（布爾值）6、JavaScript 獲取屏幕的高度和寬度7、JavaScript 設(shè)置和返回屏幕的刷新率（=）8、獲取屏幕每英寸的水平方向和豎直方向的常規(guī)點(diǎn)數(shù)本套課程教學(xué)模式：基礎(chǔ)知識(shí)（實(shí)例前的準(zhǔn)

3、備）實(shí)例演示（加深對(duì)基礎(chǔ)知識(shí)的理解和認(rèn)識(shí)）= = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = =每個(gè) Window 對(duì)象的 screen 屬性都一個(gè) Screen 對(duì)象。Screen 對(duì)象中存放著有關(guān)顯示瀏覽器屏幕的信息。JavaScript 程序?qū)⒗眠@些信息來優(yōu)化它們的輸出，以達(dá)到用戶的顯示要求。例如，一個(gè)程序可以根據(jù)顯示器的尺寸選擇使用大圖像還是使用小圖像，它還可以根據(jù)顯示器的顏色深度選擇使用 16 位色還是使用 8 位色的圖形。另外，JavaScript 程序還能根據(jù)

4、有關(guān)屏幕尺寸的信息將新的瀏覽器窗口定位在屏幕中間。availHeight 返回顯示屏幕的高度 (除 Windows 任務(wù)欄之外)。availWidth 返回顯示屏幕的寬度。bufferDepth 設(shè)置或返回在 off-screen bitmap buffer 中調(diào)色板的比特深度。colorDepth 返回目標(biāo)設(shè)備或緩沖器上的調(diào)色板的比特深度。deviceXDPI 返回顯示屏幕的每英寸水平點(diǎn)數(shù)。deviceYDPI 返回顯示屏幕的每英寸垂直點(diǎn)數(shù)。fontSmoothingEnabled 返回用戶是否在顯示控制面板中啟用了字體平滑。height 返回顯示屏幕的高度。logicalXDPI 返回顯示

5、屏幕每英寸的水平方向的常規(guī)點(diǎn)數(shù)。logicalYDPI 返回顯示屏幕每英寸的垂直方向的常規(guī)點(diǎn)數(shù)。pixelDepth 返回顯示屏幕的顏色分辨率（比特每像素）。updateerval 設(shè)置或返回屏幕的刷新率。width 返回顯示器屏幕的寬度。一、JavaScript 獲取屏幕的可用高度了顯示瀏覽器的屏幕的可用高度，以像素計(jì)。在 WindowsavailHeight 屬性這樣的操作系統(tǒng)中，這個(gè)可用高度不包括分配給半特性（如屏幕底部的任務(wù)欄）的垂直空間。.write(Available Height: ).write(screen.availHeight + )二、JavaScript 獲取屏幕的可

6、用寬度availWidth 屬性了顯示瀏覽器的屏幕的可用寬度，以像素計(jì)。.write(Available Width: ).write(screen.availWidth + )三、JavaScript 獲取調(diào)色板比特深度bufferDepth 屬性設(shè)置或返回在 off-screen bitmap buffer 中調(diào)色板的比特深度。.write(Buffer Depth: ).write(screen.bufferDepth + )colorDepth 屬性返回目標(biāo)設(shè)備或緩沖器上的調(diào)色板的比特深度。四、JavaScript 獲取屏幕每英寸垂直點(diǎn)數(shù)和水平點(diǎn)數(shù)deviceXDPI 屬性返回顯示屏幕

7、的每英寸水平點(diǎn)數(shù)。.write(Device XDPI: ).write(screen.deviceXDPI + )deviceYDPI屬性返回顯示屏幕的每英寸垂直點(diǎn)數(shù)。.write(Device YDPI: ).write(screen.deviceYDPI + )五、JavaScript 判斷是否啟用字體平滑（布爾值）fontSmoothingEnabled 屬性返回用戶是否在顯示控制面板中啟用了字體平滑。.write(FontSmoothingEnabled: ).write(screen.fontSmoothingEnabled + )六、JavaScript 獲取屏幕的高度和寬度he

8、ight 屬性了顯示瀏覽器的屏幕的高度，以像素計(jì)。.write(Height: ).write(screen.height + )width 屬性.write(Width: ).write(screen.width + )了顯示瀏覽器的屏幕的寬度，以像素計(jì)。七、JavaScript 設(shè)置和返回屏幕的刷新率erval 屬性可設(shè)置或返回屏幕的刷新率。update.write(Updateerval: ).write(screen.updateerval + )八、獲取屏幕每英寸的水平方向和豎直方向的常規(guī)點(diǎn)數(shù)logicalXDPI 屬性可返回顯示屏幕每英寸的水平方向的常規(guī)點(diǎn)數(shù)。.write(Logical XDPI: ).write(screen.logicalXDPI + )logicalYDPI 屬性可返回顯示屏幕每英寸的垂直方向的常規(guī)點(diǎn)數(shù)。= = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = =