{"id":7983,"date":"2016-10-10T15:59:43","date_gmt":"2016-10-10T07:59:43","guid":{"rendered":"http:\/\/jpuyy.com\/?p=7983"},"modified":"2016-10-10T15:59:43","modified_gmt":"2016-10-10T07:59:43","slug":"nodejs","status":"publish","type":"post","link":"https:\/\/jpuyy.com\/?p=7983","title":{"rendered":"nodejs"},"content":{"rendered":"
node 04<\/div>\n
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Modules<\/div>\n
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Semantic Versioning<\/div>\n
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version patch<\/div>\n
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\u00a0\u00a0\u00a0 “connect”: “~2.2.1”,<\/div>\n
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\u00a0\u00a0\u00a0 “underscore”: “~1.3.3\u201d<\/div>\n
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node 03<\/div>\n
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streams<\/div>\n
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curl –upload-file abc.jpg http:\/\/localhost:3000<\/div>\n
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node 01<\/div>\n
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fs.readFileSync<\/div>\n
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fs.readFile(‘\/etc\/hosts’, function(){});<\/div>\n
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setTimeout(function(){ console.log(“here we go”)}, 5000); \/\/ \u7b49 5000ms \u518d\u8fd0\u884c function<\/div>\n
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non-blocking<\/div>\n
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epxress 05<\/div>\n
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route instances<\/div>\n
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app.route()<\/div>\n
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chaining function<\/div>\n
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single application file is too long<\/div>\n
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extracting routes to modules<\/div>\n
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var router = express.Router();<\/div>\n
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set router as a express module<\/div>\n
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module.exports = router;<\/div>\n
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var router = express.Router();<\/div>\n
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router.route(‘\/’);<\/div>\n
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app.use(‘\/cities’, router);<\/div>\n
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router.route(‘\/’)<\/div>\n
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\u00a0 .get(function (request, response) {<\/div>\n
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\u00a0\u00a0\u00a0 if(request.query.search){<\/div>\n
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\u00a0\u00a0\u00a0\u00a0\u00a0 response.json(citySearch(request.query.search));<\/div>\n
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\u00a0\u00a0\u00a0 }else{<\/div>\n
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\u00a0\u00a0\u00a0\u00a0\u00a0 response.json(cities);<\/div>\n
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\u00a0\u00a0\u00a0 }<\/div>\n
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\u00a0 })<\/div>\n
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\u00a0 .post(parseUrlencoded, function (request, response) {<\/div>\n
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\u00a0\u00a0\u00a0 if(request.body.description.length > 4){<\/div>\n
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\u00a0\u00a0\u00a0\u00a0\u00a0 var city = createCity(request.body.name<\/a>, request.body.description);<\/div>\n
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\u00a0\u00a0\u00a0\u00a0\u00a0 response.status(201).json(city);<\/div>\n
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\u00a0\u00a0\u00a0 }else{<\/div>\n
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\u00a0\u00a0\u00a0\u00a0\u00a0 response.status(400).json(‘Invalid City’);<\/div>\n
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\u00a0\u00a0\u00a0 }<\/div>\n
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\u00a0 });<\/div>\n
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router.route(‘\/:name’)<\/div>\n
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\u00a0 .get(function (request, response) {<\/div>\n
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\u00a0\u00a0\u00a0 var cityInfo = cities[request.cityName];<\/div>\n
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\u00a0\u00a0\u00a0 if(cityInfo){<\/div>\n
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\u00a0\u00a0\u00a0\u00a0\u00a0 response.json(cityInfo);<\/div>\n
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\u00a0\u00a0\u00a0 }else{<\/div>\n
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\u00a0\u00a0\u00a0\u00a0\u00a0 response.status(404).json(“City not found”);<\/div>\n
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\u00a0\u00a0\u00a0 }<\/div>\n
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\u00a0 })<\/div>\n
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\u00a0 .delete(function (request, response) {<\/div>\n
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\u00a0\u00a0\u00a0 if(cities[request.cityName]){<\/div>\n
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\u00a0\u00a0\u00a0\u00a0\u00a0 delete cities[request.cityName];<\/div>\n
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\u00a0\u00a0\u00a0\u00a0\u00a0 response.sendStatus(200);<\/div>\n
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\u00a0\u00a0\u00a0 }else{<\/div>\n
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\u00a0\u00a0\u00a0\u00a0\u00a0 response.sendStatus(404);<\/div>\n
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\u00a0\u00a0\u00a0 }<\/div>\n
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\u00a0 });<\/div>\n
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What function would you call to match all HTTP verbs?<\/div>\n
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app.all()<\/div>\n
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express 04<\/div>\n
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post & delete<\/div>\n
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body-parser<\/div>\n
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app.delete(‘\/blocks\/:name’, function(request, response){});<\/div>\n
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response.sendStatus(200);<\/div>\n
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express 03<\/div>\n
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handle routes<\/div>\n
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response.json();<\/div>\n
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\/blocks?limit=1<\/div>\n
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use request.query to access query strings<\/div>\n
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blocks.slice(1, 3)\u00a0 from 1 , 3 items<\/div>\n
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request.params.name<\/a><\/div>\n
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response.status(404).json(‘No description found for ‘ + request.params.name<\/a>)<\/div>\n
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maps placeholders to callback functions, and is commonly used for running pre-conditions on Dynamic Routes<\/div>\n
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app.param(‘name’, function(request, response, next){<\/div>\n
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});<\/div>\n
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javascript<\/div>\n
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array -> \u00a0 blocks = [‘Fixed’, ‘Movable’, ‘Rotating’];<\/div>\n
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object ->\u00a0 blocks = {<\/div>\n
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\u00a0\u00a0\u00a0 ‘Fixed’: ‘description 1’,<\/div>\n
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\u00a0\u00a0\u00a0 ‘Movable’: ‘description 2’,<\/div>\n
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\u00a0\u00a0\u00a0 ‘Rotating’: ‘description 3’<\/div>\n
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}<\/div>\n
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for object , use Object.keys(blocks) get all keys of objects.<\/div>\n
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express 02<\/div>\n
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response.sendFile(__dirname + ‘\/public\/index.html’);<\/div>\n
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express \u7684 static middleware<\/div>\n
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middleware \u7528\u4e8e\u68c0\u9a8c\uff0c\u8ba4\u8bc1\uff0c\u6570\u636e\u89e3\u6790<\/div>\n
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app.use(express.static(‘public’));<\/div>\n
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\u5f53\u8c03\u7528\u4e00\u4e2a middleware \uff0c\u53ef\u4ee5\u52a0\u4e00\u4e2a next \u8c03\u7528\u4e0b\u4e00\u4e2a middleware<\/div>\n
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app.use(function(request, response, next) {<\/div>\n
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\u00a0\u00a0\u00a0 next();<\/div>\n
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});<\/div>\n
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\u5230\u6700\u540e\u4e00\u4e2a middleware\uff0c\u6ca1\u6709 next \u5219\u54cd\u5e94\u4e00\u4e2a done<\/div>\n
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app.use(function(request, response, next){<\/div>\n
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\u00a0\u00a0\u00a0 response.send(‘done!’);<\/div>\n
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});<\/div>\n
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express \u4f7f\u7528 ajax \u8fd4\u56de<\/div>\n
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express 01<\/div>\n
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\u5b89\u88c5 node \u5e76\u6307\u5b9a\u7248\u672c<\/div>\n
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npm install express@4.9<\/div>\n
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response.send();<\/div>\n
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blocks = [“a”, “b”, “c”];<\/div>\n
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response.send(blocks);<\/div>\n
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curl \u67e5\u770b header \u4f1a\u53d1\u73b0\u81ea\u52a8\u89e3\u6790\u6210 json<\/div>\n
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\u7b49\u540c\u4e8e<\/div>\n
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response.json(blocks);<\/div>\n
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302\u8df3\u8f6c<\/div>\n
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response.redirect(‘\/parts’);<\/div>\n
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301\u8df3\u8f6c<\/div>\n
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response.redirect(301, ‘\/parts’);<\/div>\n
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<\/div>\n","protected":false},"excerpt":{"rendered":"

node 04 Modules Semantic Versioning version patch \u00a0\u00a0\u00a0 “connect”: “~2.2.1”, \u00a0\u00a0\u00a0 “underscore”: “~1.3.3\u201d node 03 streams curl –upload-file abc.jpg http:\/\/localhost:3000 node 01 fs.readFileSync fs.readFile(‘\/etc\/hosts’, function(){}); setTimeout(function(){ console.log(“here we go”)}, 5000); \/\/ \u7b49 5000ms \u518d\u8fd0\u884c function non-blocking epxress 05 route instances app.route() chaining function single application file is too long extracting routes to modules var router […]<\/p>\n","protected":false},"author":3,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[140],"tags":[],"class_list":["post-7983","post","type-post","status-publish","format-standard","hentry","category-nodejs"],"_links":{"self":[{"href":"https:\/\/jpuyy.com\/index.php?rest_route=\/wp\/v2\/posts\/7983","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/jpuyy.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/jpuyy.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/jpuyy.com\/index.php?rest_route=\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/jpuyy.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=7983"}],"version-history":[{"count":1,"href":"https:\/\/jpuyy.com\/index.php?rest_route=\/wp\/v2\/posts\/7983\/revisions"}],"predecessor-version":[{"id":7984,"href":"https:\/\/jpuyy.com\/index.php?rest_route=\/wp\/v2\/posts\/7983\/revisions\/7984"}],"wp:attachment":[{"href":"https:\/\/jpuyy.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=7983"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/jpuyy.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=7983"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/jpuyy.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=7983"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}