頁面品質整體評估

phantomjs，作為引擎，可跨平台，以js指令碼策略，命令列的執行webkit，進行頁面載入和統計資訊。

YSlow，分析頁面元素，可對頁面進行評分和評級

pagespeed， 分析頁面元素，進行評分和修改建議。（nginx和apache有相關的外掛程式，在webserver層面將對這些影響頁面速度的元素進行處理，比如壓縮空白，合并多個請求等)

phantomjs本身的webpage空間的時間方面，連線時間，和dns解析時間等還沒有，但是webkit本身是支援webinspector，各種元素時間軸都有的。如何整合待進一步研究。

Use YSlow and PhantomJS to evaluate page performance

$ wget https://github.com/downloads/marcelduran/yslow/yslow-phantomjs-3.1.1.zip
$ unzip yslow-phantomjs-3.1.1.zip
$ cp yslow.js ~/lib/js/

$ phantomjs ~/lib/js/yslow.js --info basic  "http://test.example.com"
{
    "w":146046,
    "o":84,
    "u":"http%3A%2F%2Ftest.example.com",
    "r":14,
    "i":"ydefault",
    "lt":1103
}

overall score: B (84)
url: http://test.example.com
# of requests: 14
ruleset: ydefault
page load time: 1103

Use YSlow and PhantomJS to gather page statistics

$ phantomjs ~/lib/js/yslow.js --info stats --format plain "http://test.example.com"

size: 146.0K (146046 bytes)
overall score: B (84)
url: http://test.example.com
# of requests: 14
ruleset: ydefault
page load time: 1103
page size (primed cache): 23.8K (23828 bytes)
# of requests (primed cache): 12
statistics by component:
    doc:
        # of requests: 1
        size: 23.8K (23828 bytes)
    css:
        # of requests: 2
        size: 35.9K (35967 bytes)
    js:
        # of requests: 5
        size: 79.6K (79668 bytes)
    cssimage:
        # of requests: 3
        size: 5.0K (5071 bytes)
    image:
        # of requests: 2
        size: 1.5K (1512 bytes)
    favicon:
        # of requests: 1
        size: 0.0K (0 bytes)
statistics by component (primed cache):
    doc:
        # of requests: 1
        size: 23.8K (23828 bytes)
    css:
        # of requests: 2
        size: 0.0K (0 bytes)
    js:
        # of requests: 3
        size: 0.0K (0 bytes)
    cssimage:
        # of requests: 3
        size: 0.0K (0 bytes)
    image:
        # of requests: 2
        size: 0.0K (0 bytes)
    favicon:
        # of requests: 1
        size: 0.0K (0 bytes)

直接命令列

 npm install yslow -g yslow --info basic --format plain igvita.har    size: 67.0K (67000 bytes)    overall score: A (94)    url: http://www.igvita.com/    # of requests: 9    ruleset: ydefault    page load time: 821

Use PhantomJS and the netsniff.js to generate a HAR file

$ phantomjs ~/lib/js/netsniff.js"http://test.example.com"
> ~/tmp/example.har

資料很有限，等待繼續整合inspector