Duobei.com Site Title

发现课程 - 多贝公开课

Duobei.com Meta Description

多贝公开课提供实用类公开课程及课程表。你可以标记学习进度、向老师提问,与同学们一起评分、分享笔记。多贝公开课将为你营造一个和老师、同学平等交流的学习社区。

Duobei.com Test Results

Duobei.com Mobile Usability: 62/100

Quick overview:
Use legible font sizes
The following text on your page renders in a way that may be difficult for some of your visitors to read. Use legible font sizes to provide a better user experience.
The following text fragments have a small font size. Increase the font size to make them more legible.
首页 renders only 6 pixels tall (15 CSS pixels).
...
Size tap targets appropriately
Some of the links/buttons on your webpage may be too small for a user to easily tap on a touchscreen. Consider making these tap targets larger to provide a better user experience.
The following tap targets are close to other nearby tap targets and may need additional spacing around them.
The tap target <a href="/" class="main_nav main_nav_home current">首页</a> is close to 1 other tap targets.
...
Configure the viewport
Your page does not have a viewport specified. This causes mobile devices to render your page as it would appear on a desktop browser, scaling it down to fit on a mobile screen. Configure a viewport to allow your page to render properly on all devices.

Duobei.com Mobile Speed: 74/100

Quick overview:
Eliminate render-blocking JavaScript and CSS in above-the-fold content
Your page has 2 blocking CSS resources. This causes a delay in rendering your page.
Optimize CSS Delivery of the following:
http://static.duobei.com/styles/course_discovery.css?v=43b4fe3709f11c54494e9b1607b5fd52
...
Reduce server response time
Optimize images
Properly formatting and compressing images can save many bytes of data.
Optimize the following images to reduce their size by 21.9KiB (40% reduction).
Losslessly compressing http://img.duobei.com/logo-120-48-20160504.png could save 15.7KiB (90% reduction).
...
Leverage browser caching
Setting an expiry date or a maximum age in the HTTP headers for static resources instructs the browser to load previously downloaded resources from local disk rather than over the network.
Leverage browser caching for the following cacheable resources:
http://www.google-analytics.com/ga.js (2 hours)
Minify JavaScript
Compacting JavaScript code can save many bytes of data and speed up downloading, parsing, and execution time.
Minify JavaScript for the following resources to reduce their size by 1.7KiB (34% reduction).
Minifying http://static1.duobei.com/javascript/global_new.js?_upv=08 could save 928B (31% reduction) after compression.
...

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