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Posted on July 8th, 2010 by jeanne

View more from .

Web developers preparing for the iPad…

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320×480是iPhone的屏幕分辨率,而1024×768是iPad的屏幕分辨率。凭着这组分辨率的变化以及外观的变化,很多人会觉得iPad只不过是“放大版”的iPhone。不但有着一致的制作工艺和外观,连“Home”键都一致的摆在了屏幕下方。

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有人说:我的站点支持iPhone,且自适应宽度,放到iPad上,照样没什么问题!兼容多平台!
是的,的确是没有什么问题。iPad较之iPhone最明显的优势是其拥有一个大屏幕、大分辨率及高速的网络环境(wifi、3G) , 有了这些优势,iPad自带的Safari完全有提供“桌面”web体验的能力,而iPad用户也期待这方面的体验。如果你有一个针对小屏幕移动设备版本的网站,请不要直接将它自适应或拉升然后呈现给iPad用户,因为实在是太憋屈iPad了!
深入到两者的应用程序,例如日历程序,该应用程序在iPhone和iPad就有不一样的外观和体验。

iPhone版gmail无论从界面还是体验都得到很多果粉的赞赏,google还专门为iPad开发gmail新界面。新版的gmail完全为iPad量身定制,充分利用iPad屏幕空间带给用户全新的界面体验。现在用户只需要通过iPad登陆mail.google.com就能看到如下图全新的Gmail界面。

上图就是 iPad 优化版的Gmail 界面,由于iPad的屏幕很大,所以界面分成了左右两栏,将左栏为邮件列表界面和右栏为邮件内容界面显示在一起。邮件和预览框排列非常令人舒适,甚至还支持全屏的编辑窗口。用户体验上,google一直都是走在了时代前沿,这点是否也值得我们去学习呢?

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在服务器端请求user agent信息标识,客户端返回信息,服务器通过user agent适配库识别客户端,根据结构适配不同web版本,然后返回到客户端。简单的说就是,许多网站都在服务器端通过检查浏览器的user agent字符串来确定是否为他们网站的移动版本。iPad的user agent字符串为:

Safari on iPad user agent string in IOS 3.2 SDK beta 3

Mozilla/5.0 (iPad; U; CPU OS 3_2 like Mac OS X; en-us) AppleWebKit/531.21.10 (KHTML, like Gecko) Version/4.0.4 Mobile/7B334b Safari/531.21.10

说明:

  • 平台: iPad; U; CPU OS 3_2 like Mac OS X; en-us
  • 版本号:Version/4.0.4 Mobile/7B334b Safari/531.21.10
  • User Agent不依赖于版本号

需要注意的是,当iPad Safari发布新版本时,字符串中的版本号可能会有所变化,所以任何代码检查user agent字符串不应该依赖于版本号。

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这里提供一些javascript检测代码,用于检测iPhone、iPod、iPad设备。

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// Apple detection object
var Apple = {};
Apple.UA = navigator.userAgent;
Apple.Device = false;
Apple.Types = ["iPhone", "iPod", "iPad"];
for (var d = 0; d < Apple.Types.length; d++) {
	var t = Apple.Types[d];
	Apple[t] = !!Apple.UA.match(new RegExp(t, "i"));
	Apple.Device = Apple.Device || Apple[t];
}
// is this an Apple device?
alert(
	"Apple device? " + Apple.Device +
	"\niPhone? " + Apple.iPhone +
	"\niPod? " + Apple.iPod +
	"\niPad? " + Apple.iPad
);

也可以使用类似的PHP代码在服务器端检测,具体方法可以查看。

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应用程序图标是什么概念呢?其实就是你在访问一个网站后,觉得还不错,将书签存到桌面,桌面上会出现一个该网站的应用程序图标,下一次打开就直接点击该图标而不需要重新输入网址。如果我们没有提供给iOS一个应用程序图标的话,iOS会自动将页面截屏并缩放到相应尺寸生成图标。那么怎么创建一个应用程序图标呢?

在iPhone专题的介绍中,我们已经知道,为了与内置图标保持协调一致,iOS会自动给图标添加一些视觉效果如圆角、阴影、光泽。为了保证你的图标可以利用这些视觉效果,应该提供一个尺寸为72×72像素,90度直角,无任何发亮或光泽的png格式图片(如果图片不符合标准尺寸,iOS会自动按比例调整)。然后,将图片命名为icon.png, 通过<link href="icon.png" rel="apple-touch-icon-precomposed">来进行调用。

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每个应用程序都应当提供一个小图标,这样 iPhone OS 才能在当应用程序名称符合 Spotlight 搜索条件时进行显示。
你的小图标应当能够清晰标识你的应用程序,使用户能够在搜索结果列表中明确识别出来。要实现这一点,应当创建一个简洁、吸引人的图标. 该图标为png格式,且大小约为50x50px(iphone为29x29px),将该图片命名为Icon-Small.png,并放在应用程序包的最顶层。如果你没有提供名为 Icon-Small.png 的图标,且你的应用程序包中也不包含早期版本的名为 Icon-Settings.png 的小图标的话,iPhone OS 将会将你的应用程序图标截取左下方一块显示在搜索结果和设置中。
如果你的应用程序包中已经包含了名为 Icon-Settings.png 的小图标,但没有包含名为 Icon-Small.png 的图标的话,iPhone OS 会在搜索结果中显示设置图标。不过,你应当更新你的应用程序包,使其仅包含 Icon-Small.png 文件。setting icon,iPhone和iPad一样都是29x29px。

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如果你没有一台iPad作为测试机,你可以在桌面版的Safari上模拟iPad中的Safari。方法同iPhone的设置,详见PPT。
设置完成后,在Safari的菜单里选择开发->用户代理->其它,在弹出的对话框里将前面提到的user agent字符串黏贴进去。当你点击了”好”,页面会自动reload,以你所键入的iPad user agent去呈现。
如何确定页面已经按照新的user agent去呈现页面了呢?其实打开Safari菜单中的“显示web检查器”,从资源里就能看到请求的标头。

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是一个为 iPad 设计的用来查时区的 HTML5 软件。它简单、到位,可以离线使用,并且速度极快。everytimezone.com 的作者Thomas Fuchs是资深 JavaScript 专家,也是Prototype 的核心开发者之一。他近日在其blog上分享了如何保证HTML5软件在iPad上飞速运行的7条秘诀。

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-webkit-gradient 的工作方法是构建位图,对于浏览器的渲染来说,这和从外部加载图片是完全一样的。Mobile Safari 显示图片速度之慢是出了名的,要解决这个问题,基本上只能不用图片和 -webkit-gradient。但是,可以使用HTML5的canvas标签来绘制渐变效果。

用 canvas 时可以在某种程度上复用 -webkit-gradient,比如这样:

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// WebKit CSS gradient
-webkit-gradient(linear, left top, right top,
  from(#4b4c4d),
  color-stop(0.249, #4b4c4d),
  color-stop(0.25, #575b5c),
  color-stop(0.329, #575b5c),
  color-stop(0.33, #6b7071),
  color-stop(0.749, #6b7071),
  color-stop(0.75, #575b5c),
  color-stop(0.909, #575b5c),
  color-stop(0.91, #4b4c4d),
  to(#4b4c4d)
);
 
// <canvas> gradient
var gradient = $('canvas').getContext("2d").createLinearGradient(0,0,230,0);
gradient.addColorStop(0,'#4b4c4d');
gradient.addColorStop(0.249,'#4b4c4d');
gradient.addColorStop(0.25,'#575b5c');
gradient.addColorStop(0.329,'#575b5c');
gradient.addColorStop(0.33,'#6b7071');
gradient.addColorStop(0.749,'#6b7071');
gradient.addColorStop(0.75,'#575b5c');
gradient.addColorStop(0.909,'#575b5c');
gradient.addColorStop(0.91,'#4b4c4d');
gradient.addColorStop(1,'#4b4c4d');

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这也是速度变慢的另外一个重要的原因。也意味着我们要依赖canvas来实现发光和阴影的效果。

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在Safari上,只要使用-webkit-transform这个CSS属性就可以启动硬件加速了。硬件加速也有其局限性,例如同时跑的动画帧数就有限制,如果超过了这个限制,动画就会闪烁,有时还会出错,不过如果轻度使用的话,效果会非常棒!

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触控事件例如ontouchmove, 触控事件是个好选择,因为onClick事件在iPad上用起来会有些延迟。在的源代码里有些小技巧,教你如何在使用触控事件的同时,也能够支持非触控设备上的浏览器。

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var supportsTouch = 'createTouch' in document;
 
element[supportsTouch ? 'ontouchmove' : 'onmousemove'] = function(event){
  var pageX = event.pageX;
  if (event.touches) pageX = event.touches[0].pageX;
  // ...
}

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因为某些原因,使用opacity属性,有时会干扰硬件加速。如果你感到速度变慢,又看不出哪里出了问题的话,就检查一下有没有用到opacity吧…

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万事无捷径,请手写适用于自己项目的javascript代码,因为当前的框架像Jquery也只为桌面浏览器做了优化。

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因为mobile Safari只提供了3D转化的硬件加速。使用-webkit-transform 时,记得用 translate3d(x,y,z) 语法,而不是 translate(x,y)。因为某种原因,后者无法支持硬件加速,至少在 iOS 3.x 上不行(不过在桌面版 Safari 里似乎没问题)。推荐大家看看做的,里面有很多很棒的代码,也是演示如何为页面在移动版 WebKit 上的速度进行优化的好例子。)

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Tags: , , ,

This entry was posted on Thursday, July 8th, 2010 at 11:30 and is filed under . You can follow any responses to this entry through the feed. You can , or from your own site.

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Mechanical Genital trauma or surgery; Peyronie's disease; congenital abnormalities Fibrous penile plaques or chordae None When there is angina or heart failure, the doctor may need to determine whether the heart has enough reserve to safely carry out the work necessary for sexual activity by performing cardiac treadmill stress testing. Intraurethral therapy (MUSE) Ejaculation, the release of semen at climax, is triggered when the man reaches a critical level of excitement. Sexual stimulation causes nerves in the penis to send chemical messages or impulses to the spinal cord and into the brain. There, more chemical messages are sent back to the penis causing ejaculation. Pelvic Trauma, Surgery, Radiation Therapy Reality: The incidence of erectile dysfunction certainly increases with age, but it is in no way an inevitable part of the aging process. Changes in erections and in the amount of time it takes to achieve one are normal signs of aging and should not be confused with ED, which is the repeated inability to get or keep an erection firm enough for sexual intercourse. Lifestyle changes, such as quitting smoking, exercising regularly, avoiding excessive alcohol consumption, and carefully monitoring chronic illnesses, like kidney disease or diabetes, can help decrease your risk of developing ED. Li said the study is significant because chemical manufacturers and other defenders of BPA have long complained that research raising questions about its health effects was conducted on laboratory animals. 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