What does progressive enhancement mean in JS?
渐进增强的意思是针对低版本浏览器进行构建页面,保证最基本的功能,然后再针对高级浏览器进行效果、交互等改进和追加功能达到更好的用户体验。
JS中渐进增强的意思是:
想了解渐进增强什么意思,也同时了解优雅降级,就一个意思,为了实现css3的特效和js之间的配合实现设计效果。不过话是这么说的 但是这个东西思路还是有些不一样。
优雅降级
:在网站设计时,术语优雅降级指的是新的或者是复杂特点的明智实施,目的是确保大部分的因特网使用者可以有效的和站点上的页面交互。过去几年站点设计和因特网使用的重要的里程碑包括图片,帧,在线游戏,Java, JavaScript, ActiveX控制,浏览标签,因特网上的语音通话(VoIP)和视频会议技术的引入。
当浏览器或操作系统的更新版本发布时,它们经常包含新的特征来保持和因特网功能的最新增强的同步。
因为各种各样的原因,许多因特网使用者喜欢使用他们已有的浏览器而不是每当一个新的Web站点技术流行时,立即更新到最新版本。当一个站点被有意识设计成有优雅降级的特点时,这些使用者不会突然被强迫升级他们的浏览器除非他们正在使用“古董”。
说人话就是:优雅降级是因某些新发布的CSS样式或HTML标签在老的浏览器上不兼容,而在写代码时做的了一定的处理,确保在浏览器不兼容时,也能够达到原效果或部分原效果。
渐进增强
progressive enhancement:针对低版本浏览器进行构建页面,保证最基本的功能,然后再针对高级浏览器进行效果、交互等改进和追加功能达到更好的用户体验。
两种方法分别对应着不同的用户群体,优雅降级 属于大部分优质客户(身上装备很好的人),渐进增强属于大部分都是拿菜刀打怪升级的客户
下面这个是觉得非常好用的一个函数!
/** 判断浏览器是否支持某一个CSS3属性 @param {String} 属性名称 @return {Boolean} true/false @version 1.0 @author ydr.me 2014年4月4日14:47:19 */ function supportCss3(style) { var prefix = [‘webkit’, ‘Moz’, ‘ms’, ‘o’], i, humpString = [], htmlStyle = document.documentElement.style, _toHumb = function (string) { return string.replace(/-(\w)/g, function ($0, $1) { return $1.toUpperCase(); }); }; for (i in prefix) humpString.push(_toHumb(prefix[i] + ‘-’ + style)); humpString.push(_toHumb(style)); for (i in humpString) if (humpString[i] in htmlStyle) return true; return false; }
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