核心内容摘要
CSS 选择器 (1) 核心语法规则、常见的选择器分类
小旋风蜘蛛池使用教程
文件扩展名 Content-Type(Mime-Type) 描述 . application/x- .* application/octet-stream 二进制流，不知道下载文件类型 .pdf application/pdf PDF（Portable Document Format的简称，意为“便携式文件格式”） .ai application/postscript PostScript（PS）是主要用于电子产业和桌面出版领域的一种页面描述语言和编程语言。 .xml application/atom+xml Atom feeds .js application/ecmascript 相当于application/javascript但是严格的处理规则 .edi application/EDI-X12 EDI ANSI ASC X12数据 .edi application/EDIFACT EDI EDIFACT数据 .json application/json JSON（JavaScript Object Notation） .js application/javascript ECMAScript/JavaScript（相当于application/ecmascript但是宽松的处理规则） .ogg application/ogg Ogg, 视频文件格式 .rdf application/rdf+xml 资源描述框架（Resource Description Framework，缩写 RDF），是万维网联盟（W3C）提出的一组标记语言的技术标准，以便更为丰富地描述和表达网络资源的内容与结构。 .xml application/rss+xml RSS（Really Simple Syndication,简易信息聚合）是一种消息来源格式规范，用以聚合经常发布更新数据的网站，例如博客文章、新闻、音频或视频的网摘 .xml application/soap+xml 简单对象访问协议（SOAP，全写为Simple Object Access Protocol）是交换数据的一种协议规范，使用在计算机网络Web服务（web service）中，交换带结构信息。 .woff application/font-woff Web开放字体格式（Web Open Font Format，简称WOFF）是一种网页所采用的字体格式标准。（推荐使用；使用application/x-font-woff直到它变为官方标准） .xhtml application/xhtml+xml 可扩展超文本标记语言（eXtensible HyperText Markup Language，XHTML），是一种标记语言，表现方式与超文本标记语言（HTML）类似，不过语法上更加严格。 .xml application/xml 可扩展标记语言（英语：eXtensible Markup Language，简称: XML），是一种标记语言。 .dtd application/xml-dtd XML文件的文件型别定义（Document Type Definition）可以看成一个或者多个XML文件的模板，在这里可以定义XML文件中的元素、元素的属性、元素的排列方式、元素包含的内容等等。 .xml application/xop+xml 二进制优化封装协议(Xmlbinary Optimized Packaging) .zip application/zip ZIP压缩文件 .gzip application/gzip Gzip是若干种文件压缩程序的简称，通常指GNU计划的实现，此处的gzip代表GNU zip。 .xls application/x-xls XLS 就是 Microsoft Excel 工作表，是一种非常常用的电子表格格式。 .001 application/x-001 .301 application/x-301 .906 application/x-906 .a11 application/x-a11 .awf application/vnd.adobe.workflow .bmp application/x-bmp .c4t application/x-c4t .cal application/x-cals .cdf application/x-netcdf .cel application/x-cel .cg4 application/x-g4 .cit application/x-cit .bot application/x-bot .c90 application/x-c90 .cat application/vnd.ms-pki.seccat .cdr application/x-cdr .cer application/x-x509-ca-cert .cgm application/x-cgm .cmx application/x-cmx .crl application/pkix-crl .csi application/x-csi .cut application/x-cut .dbm application/x-dbm .cmp application/x-cmp .cot application/x-cot .crt application/x-x509-ca-cert .dbf application/x-dbf .dbx application/x-dbx .dcx application/x-dcx .dgn application/x-dgn .dll application/x-msdownload .dot application/msword .der application/x-x509-ca-cert .dib application/x-dib .doc application/msword .drw application/x-drw .dwf application/x-dwf .dxb application/x-dxb .edn application/vnd.adobe.edn .dwg application/x-dwg .dxf application/x-dxf .emf application/x-emf .epi application/x-epi .eps application/postscript .exe application/x-msdownload .fdf application/vnd.fdf .eps application/x-ps .etd application/x-ebx .fif application/fractals .frm application/x-frm .gbr application/x-gbr .g4 application/x-g4 .gl2 application/x-gl2 .hgl application/x-hgl .hpg application/x-hpgl .hqx application/mac-binhex40 .hta application/hta .gp4 application/x-gp4 .hmr application/x-hmr .hpl application/x-hpl .hrf application/x-hrf .icb application/x-icb .ico application/x-ico .ig4 application/x-g4 .iii application/x-iphone .ins application/x-internet-signup .iff application/x-iff .igs application/x-igs .img application/x-img .isp application/x-internet-signup .jpe application/x-jpe .js application/x-javascript .jpg application/x-jpg .lar application/x-laplayer-reg .latex application/x-latex .lbm application/x-lbm .ls application/x-javascript .ltr application/x-ltr .man application/x-troff-man .mdb application/msaccess .mac application/x-mac .mdb application/x-mdb .mfp application/x-shockwave-flash .mi application/x-mi .mil application/x-mil .mocha application/x-javascript .mpd application/vnd.ms-project .mpp application/vnd.ms-project .mpt application/vnd.ms-project .mpw application/vnd.ms-project .mpx application/vnd.ms-project .mxp application/x-mmxp .nrf application/x-nrf .out application/x-out .p12 application/x-pkcs12 .p7c application/pkcs7-mime .p7r application/x-pkcs7-certreqresp .pc5 application/x-pc5 .pcl application/x-pcl .pdx application/vnd.adobe.pdx .pgl application/x-pgl .pko application/vnd.ms-pki.pko .p10 application/pkcs10 .p7b application/x-pkcs7-certificates .p7m application/pkcs7-mime .p7s application/pkcs7-signature .pci application/x-pci .pcx application/x-pcx .pdf application/pdf .pfx application/x-pkcs12 .pic application/x-pic .pl application/x-perl .plt application/x-plt .png application/x-png .ppa application/vnd.ms-powerpoint .pps application/vnd.ms-powerpoint .ppt application/x-ppt .prf application/pics-rules .prt application/x-prt .ps application/postscript .pwz application/vnd.ms-powerpoint .ra audio/vnd.rn-realaudio RealAudio是一种由RealNetworks发展的RealMedia多媒体音频文件格式，仅指RealPlayer中能够识别的音频文件，也可以理解为real格式的音频文件。 .ras application/x-ras .pot application/vnd.ms-powerpoint .ppm application/x-ppm .ppt application/vnd.ms-powerpoint .pr application/x-pr .prn application/x-prn .ps application/x-ps .ptn application/x-ptn .red application/x-red .rjs application/vnd.rn-realsystem-rjs .rlc application/x-rlc .rm application/vnd.rn-realmedia .rat application/rat-file .rec application/vnd.rn-recording .rgb application/x-rgb .rjt application/vnd.rn-realsystem-rjt .rle application/x-rle .rmf application/vnd.adobe.rmf .rmj application/vnd.rn-realsystem-rmj .rmp application/vnd.rn-rn_music_package .rmvb application/vnd.rn-realmedia-vbr .rnx application/vnd.rn-realplayer .rpm audio/x-pn-realaudio-plugin .rms application/vnd.rn-realmedia-secure .rmx application/vnd.rn-realsystem-rmx .rsml application/vnd.rn-rsml .rtf application/msword .rv video/vnd.rn-realvideo .sat application/x-sat .sdw application/x-sdw .slb application/x-slb .rtf application/x-rtf .sam application/x-sam .sdp application/sdp .sit application/x-stuffit .sld application/x-sld .smi application/smil .smk application/x-smk .smil application/smil .spc application/x-pkcs7-certificates .spl application/futuresplash .ssm application/streamingmedia .stl application/vnd.ms-pki.stl .sst application/vnd.ms-pki.certstore .tdf application/x-tdf .tga application/x-tga .sty application/x-sty .swf application/x-shockwave-flash .tg4 application/x-tg4 .tif application/x-tif .vdx application/vnd.visio .vpg application/x-vpeg005 .vsd application/x-vsd .vst application/vnd.visio .vsw application/vnd.visio .vtx application/vnd.visio .torrent application/x-bittorrent .vda application/x-vda .vsd application/vnd.visio .vss application/vnd.visio .vst application/x-vst .vsx application/vnd.visio .wb1 application/x-wb1 .wb3 application/x-wb3 .wiz application/msword .wk4 application/x-wk4 .wks application/x-wks .wb2 application/x-wb2 .wk3 application/x-wk3 .wkq application/x-wkq .wmf application/x-wmf .wmd application/x-ms-wmd .wp6 application/x-wp6 .wpg application/x-wpg .wq1 application/x-wq1 .wri application/x-wri .ws application/x-ws .wmz application/x-ms-wmz .wpd application/x-wpd .wpl application/vnd.ms-wpl .wr1 application/x-wr1 .wrk application/x-wrk .ws2 application/x-ws .xdp application/vnd.adobe.xdp .xfd application/vnd.adobe.xfd .xfdf application/vnd.adobe.xfdf .xls application/vnd.ms-excel .xwd application/x-xwd .sis application/vnd.symbian.install .x_t application/x-x_t .apk application/vnd.android.package-archive .x_b application/x-x_b .sisx application/vnd.symbian.install .ipa application/vnd.iphone .xap application/x-silverlight-app .xlw application/x-xlw .xpl audio/scpls .anv application/x-anv .uin application/x-icq
