浏览器和设备 | Browsers and devices
譬如,使用将一个插件的样式上下文环境限制:postcss-plugin-context .css-example.is-test-for-css4-browsers{color:gray(255,50%
示例 <label>Chooseabrowserfromthislist:<inputlist="<em>browsers</em>"name="myBrowser"/></label><datalistid="<em>browsers</em>
letproducts=newProxy({browsers:['InternetExplorer','Netscape']},{get:function(obj,prop){//Anextrapropertyif
{"presets":[["env",{"targets":{"browsers":["last2versions","safari>=7"]}}]]} 同样,如果你目标开发Node.js而不是浏览器应用的话
varying between being shown for 50ms down to 0ms, which will cause the frame// to be skipped in most browsers
browsers=['Chrome','Firefox','Safari','Opera','IE']browsers.length#=>5browsers.count#=>5 检查数组是否包含任何元素
AnHTTP"client"isaprogramthatestablishesaconnectiontoaserverforthepurposeofsendingoneormoreHTTPrequests.AnHTTP"server"isaprogramthatacceptsconnectionsinordertoserviceHTTPrequestsbysendingHTTPresponses.Theterms"client"and"server"referonlytotherolesthattheseprogramsperformforaparticularconnection.Thesameprogrammightactasaclientonsomeconnectionsandaserveronothers.Theterm"useragent"referstoanyofthevariousclientprogramsthatinitiatearequest,including(butnotlimitedto)browsers