【正文】 Visafree policy brings Chengdu biz, tourism boost. Making national headlines several times, Chengdu39。換句話說(shuō)，Android用戶更關(guān)心“開(kāi)放的平臺(tái)”，而不是Google的品牌?？紤]用戶的平臺(tái)。喬布斯的忠實(shí)粉絲買蘋果每個(gè)產(chǎn)品，不喜歡蘋果風(fēng)格的人做的事情可能只是“聞聞”蘋果罷了。作為開(kāi)放式和封閉式平臺(tái)的的代表，Android Froyo和iOS4都有優(yōu)缺點(diǎn)。與蘋果不同，谷歌沒(méi)有一個(gè)工廠來(lái)生產(chǎn)自己的手機(jī)，它只開(kāi)發(fā)Android系統(tǒng)和建立裝載Android應(yīng)用程序的“Android市場(chǎng)”。其他公司則不僅做這些，為宣傳一個(gè)軟件管理其開(kāi)發(fā)過(guò)程。Root39。網(wǎng)絡(luò)供應(yīng)商使用此功能來(lái)限制這些手機(jī)使用特定的國(guó)家和網(wǎng)絡(luò)供應(yīng)商。找到，蘋果將檢查他們每個(gè)程序。這是為用戶好。微軟不檢查Windows應(yīng)用程序，所有這一切都取決于用戶自己。一些SDK是完全自由和開(kāi)放的，有些則是有嚴(yán)格限制的?！败浖诸悺惫δ苁褂脩艨梢灾v不同分類的軟件放入不同的文件夾中，使它管理更加清晰。Android Froyo在網(wǎng)絡(luò)共享的方式上取得了領(lǐng)先。內(nèi)部緩存和隱藏類，混合動(dòng)態(tài)代碼和類優(yōu)化，在大規(guī)模地改善JavaScript效率。這會(huì)保存時(shí)間和精力，以及更容易執(zhí)行類的優(yōu)化和內(nèi)部緩存。 快速屬性訪問(wèn)JavaScript是一種動(dòng)態(tài)語(yǔ)言，這意味著屬性可以在運(yùn)行時(shí)進(jìn)行添加或刪除，并且它們會(huì)經(jīng)常改變。當(dāng)它又被轉(zhuǎn)換進(jìn)來(lái)時(shí)，我們又回到了其以前的快照。CFNetwork和SQLite同樣是這2層一部分。它們是：，使用戶可以在手機(jī)上觀看Flash。作為軟件和硬件層之間的抽象層，Linux內(nèi)核隱藏硬件執(zhí)行的細(xì)節(jié)，并為上層提供綜合服務(wù)。一方面，Android是基于Linux內(nèi)核，Dalvik虛擬機(jī)，它是開(kāi)源的。關(guān)鍵詞：Android；iPhone；Froyo；OS 4；智能手機(jī)；移動(dòng)平臺(tái)1 介紹近年來(lái)，智能手機(jī)的普及率不斷攀升。s Linux subsystem, similar to jailbreaking on Apple devices running the iOS operating system, overing limitations that the carriers and manufacturers put on such phones. Rooting makes it possible to use custom versions of the Android system such as CyanogenMod, supporting features unavailable in stock ROMs. It also allows for newer versions of Android not supplied by the original device manufacturer. In contrast to iOS jailbreaking, rooting is not needed to run applications not distributed by the official Android Market. It is needed however, when trying to access paid Android applications from countries which are not part of the paid applications market.. IntegrationSome panies focus only on their core industry, . develop an operating system and provide an environment for 3rd party development. Others not only do these, but manage the process of developing a software to publicizing it. Depending on the integration of platforms, we sort them to 4 kinds: full integration platform, market integration platform, device integration platform and no integration platform.The publicizing model of full integration platform is very strict. Its management ranges from device manufacturing to application release, whose representative is Apple. Apple’s factory produces iPhone, Apple’s ‘App Store’ sells application, Apple’s ‘iTunes’ is the channel of Apple’s resources. The whole process is under Apple’s control.Market integration platforms mit themselves to developing and selling softwares. Google is one of them. Unlike apple, Google don’t have a factory to manufacture its own handsets, but only developed Android and set up ‘Android Market’ for Android applications. However, panies like Google definitely have the capability to produce its own devices. Google is in good relationship with HTC, who is the OEM of TMobile, O2 and Orange, etc.Device integration platforms produce their own handsets, but don’t set up application markets. Forexample, RIM makes Blackberry, but there’s no official application market for Blackberry. No integration platforms do few things. Microsoft neither makes mobile phones, nor sets up a they do is only developing the operating system: Windows Phone 7.4. ConclusionRepresentatives of open and closed platforms, Android Froyo and iOS 4 are both loved and browsers are built into them, and their producers are both world famous revolutionary. Android leans to Internet experience, which es down in one continuous line with Google. But currently, various versions of Android fill the market, and most panies in Open Handset Alliance tend to customize their own Android systems. These facts make Android lack of a general brand image, so people may feel confused and say ‘No’ to Android. iPhone OS focuses more on entertainment and it’s very friendly. But Apple is too cool to attract more customers: Diehard fans of Steve Jobs buy every product made by Apple, and people who dislike the style Apple do things may just sniffed at Apple.Besides, Android Froyo succeeds the features of open platforms well. It’s a ‘users only’ platform, because users of Froyo can almost customize everything they want. And members of Open HandsetAlliance tend to provide more choices for users. And iOS 4, typically closed platform member, manages everything ranging from OS development to device manufacturing. It’s a ‘consider for users’ some extent, users of Android canonizes ‘free’ and ‘open’, what they care is if they have 100% management of their handsets, no matter whether the OS is called ‘Android’ or ‘Another’. Apple users are loyal to the brand。 they would like to authorize Apple to make decisions for them. So although some iPhone users love physical keyboards, they bought iPhone. In other words, Android users think a lot of ‘open platform’ rather than the brand Google。越來(lái)越多的智能手機(jī)被賣出和很多人都更加青睞于它們。2。上層的Android是基于Java的，允許開(kāi)發(fā)者使用谷歌SDK開(kāi)發(fā)Android應(yīng)用程序和在Android 市場(chǎng)銷售他們的軟件。Dalvik虛擬機(jī)和Java核心庫(kù)都包含在Android運(yùn)行層，提供Java核心庫(kù)的大多數(shù)功能。 JavaScript引擎使得互聯(lián)網(wǎng)數(shù)據(jù)傳輸更加迅速。媒體層，根據(jù)其名稱，是用來(lái)控制視頻和音頻，以及處理二維和三維圖像。2。4。在Android Froyo公布時(shí)，谷歌宣稱其擁有最流暢的網(wǎng)絡(luò)瀏覽器，因?yàn)槭褂玫腣8大多數(shù)JavaScript引擎使用一種字典式結(jié)構(gòu)來(lái)存儲(chǔ)對(duì)象的屬性。 動(dòng)態(tài)代碼生成當(dāng)JavaScript每次首回運(yùn)行時(shí)，V8將把它直接轉(zhuǎn)換為本地機(jī)器代碼，而不是解釋為字節(jié)碼。 有效的垃圾清理機(jī)制V8引擎會(huì)對(duì)內(nèi)存進(jìn)行自動(dòng)回收。搭載Froyo系統(tǒng)的智能手機(jī)可以作為PC的3G網(wǎng)卡，還可以方便地將3G信號(hào)轉(zhuǎn)換為WIFI信號(hào)。更重要的是，在App Store里有數(shù)十萬(wàn)的應(yīng)用程序，這意味著iPhone可以有多達(dá)數(shù)十萬(wàn)功能。開(kāi)放平臺(tái)的開(kāi)發(fā)人員可以獲取和修改一部分或全部源代碼。如果你安裝了病毒軟件，你自己承擔(dān)遭受的損失。然而，缺乏統(tǒng)一的管理可能導(dǎo)致市場(chǎng)的混亂，在不同的市場(chǎng)存在很多有相同的功能的軟件，用戶使用戶混淆不清。好消息是，每一個(gè)App Store的應(yīng)用都經(jīng)過(guò)官方測(cè)試，證實(shí)它是安全的。一般來(lái)說(shuō)，手機(jī)可以接受基于國(guó)際移動(dòng)用戶的SIM卡被鎖定身份。是一個(gè)過(guò)程，在Android的Linux的子系統(tǒng)中，它允許運(yùn)行Android操作系統(tǒng)的手機(jī)用戶獲得特權(quán)控制（稱為“Root訪問(wèn)”），類似運(yùn)行IOS操作系統(tǒng)蘋果設(shè)備的“越獄”，克服運(yùn)營(yíng)商和手機(jī)制造商在手機(jī)上設(shè)置的限制。根據(jù)整合平臺(tái)上，我們將他們分成4種：全集成平臺(tái)，市場(chǎng)集成平臺(tái)，設(shè)備集成平臺(tái)，并無(wú)集成平臺(tái)。然而，像谷歌公司絕對(duì)有能力生產(chǎn)自己的設(shè)備。強(qiáng)大的瀏覽器內(nèi)置于手機(jī)中，他們的生產(chǎn)商引發(fā)了世界手機(jī)的變革。此外，Android Froyo成功之處在于平臺(tái)開(kāi)放的特點(diǎn)。從某種程度上說(shuō)，Android用戶推崇39。而大多數(shù)iPhone用戶是蘋果的追隨者，他們愛(ài)史蒂夫s 72hour visafree policy has attracted wide attention from both Chinese and foreign experts and businessmen since it took effect on Sept 1 last year. The program permits citizens from 51 countries and regions including the United States, Australia, Canada and Japan who have valid visas and flight tickets to a third country to spend three days in the city. The capital of S