{"id":585,"date":"2017-02-28T18:32:18","date_gmt":"2017-02-28T10:32:18","guid":{"rendered":"https:\/\/carlos.aboutmy.info\/blog\/?p=585"},"modified":"2017-03-02T19:13:58","modified_gmt":"2017-03-02T11:13:58","slug":"%e6%b7%ba%e8%ab%87-node-js-%e7%9a%84-callback-%e5%8f%8a-javascript-object-%e7%9a%84-reference-%e7%89%b9%e6%80%a7","status":"publish","type":"post","link":"https:\/\/carlos.aboutmy.info\/blog\/?p=585","title":{"rendered":"\u6dfa\u8ac7 Node.js \u7684 callback \u53ca JavaScript object reference \u7684\u7279\u6027"},"content":{"rendered":"

Node.js \u662f\u7528 Chrome V8 JavaScript engine \u767c\u5c55\u800c\u6210\u3002V8 \u5feb\u7684\u539f\u56e0\u5728\u65bc\u61c9\u7528\u4e86 JIT \u4ee5\u53ca\u628a JavaScript \u5148 compile \u6210 C++ \u518d\u57f7\u884c\u3002\u800c Node.js \u5feb\u7684\u539f\u56e0\u9664\u4e86\u56e0\u4f7f\u7528\u4e86 V8 \u5916\uff0c\u5c31\u662f\u5176\u8457\u540d\u7684 event-driven \/ callback \u6a5f\u5236\u3002Node.js \u628a time consuming \u7684 tasks \u4f8b\u5982 disk IO\u3001DB access\u3001network requests \u7b49\uff0c\u5305\u88dd\u6210 callback\u3002CPU \u4e0d\u6703\u7b49\u56de\u61c9\u5c31\u7e7c\u7e8c\u57f7\u884c\u3002<\/p>\n

\u521d\u5b78\u8005\u6703\u89ba\u5f97\u597d\u56f0\u64fe\uff0c\u500b program \u4e0d\u77e5\u4f55\u89e3\u6709\u6642\u80fd\u6b63\u78ba\u8fd4\u56de\u7d50\u679c\uff0c\u6709\u6642\u5c31\u4e0d\u80fd\u3002\u539f\u56e0\u5728\u65bc callback \u53ca\u8ddf JavaScript object \u7684 reference \u7279\u6027\u6709\u95dc\u3002<\/p>\n

\u80fd\u6b63\u78ba\u8fd4\u56de\u7d50\u679c\u7684\u539f\u56e0\u662f CPU \u525b\u5de7\u88ab\u5176\u4ed6 task \u963b\u4e00\u963b\uff0c\u4ee5\u81f4\u5e78\u904b\u5730\u7b49\u5230\u4e86 callback\uff0c\u800c object reference \u4ee4 callback \u80fd\u8d95\u53ca\u9001\u51fa result \u524d\u70ba object \u586b\u5165\u8cc7\u6599\uff0c\u4ee4\u958b\u767c\u8005\u6709\u932f\u89ba\u4ee5\u70ba program \u80fd\u6b63\u78ba\u904b\u884c\u3002\u800c\u5f88\u597d\u591a\u6642\u5019\uff0ccallback \u672a\u8fd4\u56de\u8cc7\u6599\u6642\uff0cprogram \u5df2\u9001\u51fa\u7a7a\u767d\u7d50\u679c\u53c8\u6216 database \u64cd\u4f5c\u672a\u5b8c\u6210\u6642\u5df2\u95dc\u9589\u4e86 database \u9023\u7dda\uff0c\u4ee5\u81f4 program \u51fa\u932f\u3002<\/p>\n

JavaScript \u7684 object reference \u503c\u5f97\u63d0\u4e00\u63d0\u3002JavaScript \u8ddf Java \u4e00\u6a23\uff0c\u4e0d\u80fd\u7c21\u55ae\u4ecb\u5b9a\u662f “call-by-value” \u6216 “call-by-reference”\u3002JavaScript \u50b3\u905e primitive \u6642\uff0c\u662f\u76f4\u63a5\u628a\u503c\u8907\u5236\uff0c\u800c\u50b3\u905e object \u6642\uff0c\u5247\u628a object \u7684 reference \u8907\u5236\u3002\u9019\u53ef\u4ee5\u57cb\u89e3\u70ba\u628a object \u7684 pointer \u503c\u8907\u5236\uff0c\u800c\u4e26\u6c92\u6709\u8907\u5236 object \u672c\u8eab\u3002\u9019\u6a23\uff0c\u5c0d object \u5167\u7684 property \u9032\u884c\u66f4\u6539\u5f8c\uff0c\u6240\u6709\u6301\u6709 object \u7684 reference \u7684 variable \u90fd\u6703\u88ab\u66f4\u6539\u3002<\/p>\n

\u6700\u5f8c\uff0cNode.js \u4e0d\u55ae\u904b\u884c\u5feb\uff0c\u5c31\u9023\u958b\u767c\u6642\u9593\u90fd\u5927\u5927\u7e2e\u77ed\uff0c\u4ee5\u4e0b\u7684 RESTFul API \u5982\u679c\u6539\u7528 JavaEE \u5beb\u6210\uff0c\u6240\u9700\u7684 coding \u591a\u4e0d\u6b62\u4e00\u500d\u4ee5\u4e0a\u3002<\/p>\n

\"Node.js<\/p>\n

\u8a3b\uff1a\u4ee5\u4e0a\u7684 brute_force == 'brute_force'<\/code>\u5176\u5be6\u53ef\u4ee5\u7528 next()<\/code> \u518d\u4ea4\u5230\u5728\u4e0b\u9762\u7684 function \u8655\u7406\u3002\u9019\u88e1\u7531\u65bc logic \u7c21\u55ae\u5c31\u76f4\u63a5\u8655\u7406\u518d\u7528 return<\/code> \u7d50\u675f\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"

Node.js \u662f\u7528 Chrome V8 JavaScript engine \u767c\u5c55\u800c\u6210\u3002V8 \u5feb\u7684\u539f\u56e0\u5728\u65bc\u61c9\u7528\u4e86 JIT \u4ee5\u53ca\u628a JavaScript \u5148 compile \u6210 C++ \u518d\u57f7\u884c\u3002\u800c Node.js \u5feb\u7684\u539f\u56e0\u9664\u4e86\u56e0\u4f7f\u7528\u4e86 V8 \u5916\uff0c\u5c31\u662f\u5176\u8457\u540d\u7684 event-driven \/ callback \u6a5f\u5236\u3002Node.js \u628a time consuming \u7684 tasks \u4f8b\u5982 disk IO\u3001DB access\u3001network requests \u7b49\uff0c\u5305\u88dd\u6210 callback\u3002CPU \u4e0d\u6703\u7b49\u56de\u61c9\u5c31\u7e7c\u7e8c\u57f7\u884c\u3002 \u521d\u5b78\u8005\u6703\u89ba\u5f97\u597d\u56f0\u64fe\uff0c\u500b program \u4e0d\u77e5\u4f55\u89e3\u6709\u6642\u80fd\u6b63\u78ba\u8fd4\u56de\u7d50\u679c\uff0c\u6709\u6642\u5c31\u4e0d\u80fd\u3002\u539f\u56e0\u5728\u65bc callback \u53ca\u8ddf JavaScript object \u7684 reference \u7279\u6027\u6709\u95dc\u3002 \u80fd\u6b63\u78ba\u8fd4\u56de\u7d50\u679c\u7684\u539f\u56e0\u662f CPU \u525b\u5de7\u88ab\u5176\u4ed6 task \u963b\u4e00\u963b\uff0c\u4ee5\u81f4\u5e78\u904b\u5730\u7b49\u5230\u4e86 callback\uff0c\u800c object reference\u2026 Read More »<\/a><\/span><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[15],"tags":[],"_links":{"self":[{"href":"https:\/\/carlos.aboutmy.info\/blog\/index.php?rest_route=\/wp\/v2\/posts\/585"}],"collection":[{"href":"https:\/\/carlos.aboutmy.info\/blog\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/carlos.aboutmy.info\/blog\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/carlos.aboutmy.info\/blog\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/carlos.aboutmy.info\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=585"}],"version-history":[{"count":5,"href":"https:\/\/carlos.aboutmy.info\/blog\/index.php?rest_route=\/wp\/v2\/posts\/585\/revisions"}],"predecessor-version":[{"id":591,"href":"https:\/\/carlos.aboutmy.info\/blog\/index.php?rest_route=\/wp\/v2\/posts\/585\/revisions\/591"}],"wp:attachment":[{"href":"https:\/\/carlos.aboutmy.info\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=585"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/carlos.aboutmy.info\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=585"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/carlos.aboutmy.info\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=585"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}