{"id":17450,"date":"2025-04-18T23:58:23","date_gmt":"2025-04-18T15:58:23","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/17450.html"},"modified":"2025-04-18T23:58:23","modified_gmt":"2025-04-18T15:58:23","slug":"%e7%ac%ac%e4%b8%80%e8%af%be%ef%bc%9anode-js%e5%85%a5%e9%97%a8%ef%bc%9a%e7%8e%af%e5%a2%83%e6%90%ad%e5%bb%ba%e4%b8%8e%e7%ac%ac%e4%b8%80%e4%b8%aa%e6%9c%8d%e5%8a%a1%e5%99%a8","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/17450.html","title":{"rendered":"\u7b2c\u4e00\u8bfe\uff1aNode.js\u5165\u95e8\uff1a\u73af\u5883\u642d\u5efa\u4e0e\u7b2c\u4e00\u4e2a\u670d\u52a1\u5668"},"content":{"rendered":"

Node.js\u4ee5\u5176\u975e\u963b\u585eI\/O\u548c\u4e8b\u4ef6\u9a71\u52a8\u6a21\u578b\u8457\u79f0，\u652f\u6301\u9ad8\u6548\u5e76\u53d1\u5904\u7406\u3002\u5b83\u57fa\u4e8eV8\u5f15\u64ce，\u8fd0\u884c\u901f\u5ea6\u5feb，\u4e14\u62e5\u6709\u4e30\u5bcc\u7684\u6a21\u5757\u751f\u6001\u7cfb\u7edf\u3002Node.js\u9002\u7528\u4e8e\u6784\u5efa\u9ad8\u6027\u80fd\u7f51\u7edc\u5e94\u7528，\u662f\u5355\u7ebf\u7a0b\u5f02\u6b65\u7f16\u7a0b\u7684\u5178\u8303，\u6df1\u53d7\u5f00\u53d1\u8005\u559c\u7231\u3002\u57fa\u4e8e\u8fd9\u4e2a\u524d\u63d0，\u6211\u4eec\u5f00\u59cb\u4ece\u96f6\u5f00\u59cb\u5b66\u4e60Nodejs\u7684\u57fa\u7840\u77e5\u8bc6\u548c\u4f01\u4e1a\u5f00\u53d1\u3002<\/p>\n

\"\"<\/p>\n

\u4e00\u3001Node.js\u6982\u5ff5\u4e0e\u4e8b\u4ef6\u9a71\u52a8\u6a21\u578b<\/h4>\n

Node.js\u662f\u4e00\u79cd\u57fa\u4e8eChrome V8\u5f15\u64ce\u7684JavaScript\u8fd0\u884c\u73af\u5883，\u5b83\u4f7f\u5f97JavaScript\u53ef\u4ee5\u8131\u79bb\u6d4f\u89c8\u5668\u5728\u670d\u52a1\u5668\u7aef\u8fd0\u884c\u3002Node.js\u4ee5\u5176\u9ad8\u6548\u5904\u7406\u5e76\u53d1\u8fde\u63a5\u7684\u80fd\u529b\u800c\u8457\u79f0，\u8fd9\u4e3b\u8981\u5f97\u76ca\u4e8e\u5176\u4e8b\u4ef6\u9a71\u52a8\u6a21\u578b\u3002<\/p>\n

\u4e8b\u4ef6\u9a71\u52a8\u6a21\u578b\u662f\u4e00\u79cd\u7f16\u7a0b\u8303\u5f0f，\u5176\u4e2d\u7a0b\u5e8f\u7684\u6267\u884c\u6d41\u662f\u7531\u5916\u90e8\u4e8b\u4ef6（\u5982\u7528\u6237\u64cd\u4f5c\u3001\u6d88\u606f\u3001\u4f20\u611f\u5668\u8f93\u5165\u7b49）\u89e6\u53d1\u7684\u3002\u5728Node.js\u4e2d，\u4e8b\u4ef6\u9a71\u52a8\u6a21\u578b\u662f\u5176\u975e\u963b\u585eI\/O\u6a21\u578b\u7684\u57fa\u7840\u3002\u5b83\u5141\u8bb8\u670d\u52a1\u5668\u5728\u7b49\u5f85I\/O\u64cd\u4f5c（\u5982\u8bfb\u53d6\u6587\u4ef6\u3001\u6570\u636e\u5e93\u64cd\u4f5c\u3001\u7f51\u7edc\u8bf7\u6c42\u7b49）\u5b8c\u6210\u65f6\u7ee7\u7eed\u5904\u7406\u5176\u4ed6\u4efb\u52a1\u3002<\/p>\n

Node.js\u4e8b\u4ef6\u9a71\u52a8\u6a21\u578b\u7684\u6838\u5fc3\u662f\u4e8b\u4ef6\u5faa\u73af（Event Loop）\u3002\u4e8b\u4ef6\u5faa\u73af\u662fNode.js\u5904\u7406\u5f02\u6b65\u4e8b\u4ef6\u7684\u673a\u5236，\u5b83\u4e0d\u65ad\u5730\u68c0\u67e5\u4e8b\u4ef6\u961f\u5217，\u5e76\u5904\u7406\u4e8b\u4ef6\u961f\u5217\u4e2d\u7684\u4e8b\u4ef6\u3002\u5f53Node.js\u6267\u884c\u4e00\u4e2aI\/O\u64cd\u4f5c\u65f6，\u5b83\u4e0d\u4f1a\u7b49\u5f85\u64cd\u4f5c\u5b8c\u6210，\u800c\u662f\u7acb\u5373\u7ee7\u7eed\u6267\u884c\u4e0b\u4e00\u884c\u4ee3\u7801\u3002\u4e00\u65e6I\/O\u64cd\u4f5c\u5b8c\u6210，\u76f8\u5e94\u7684\u56de\u8c03\u51fd\u6570\u5c31\u4f1a\u88ab\u52a0\u5165\u5230\u4e8b\u4ef6\u961f\u5217\u4e2d，\u7b49\u5f85\u4e8b\u4ef6\u5faa\u73af\u6765\u5904\u7406\u3002\u8fd9\u79cd\u673a\u5236\u4f7f\u5f97Node.js\u80fd\u591f\u5728\u5355\u4e2a\u7ebf\u7a0b\u4e0a\u9ad8\u6548\u5904\u7406\u5927\u91cf\u5e76\u53d1\u8fde\u63a5\u3002<\/p>\n

\"\"<\/p>\n

\u4e8c\u3001\u5b89\u88c5Node.js\u4e0enpm\u57fa\u7840<\/h4>\n

\u8981\u4f7f\u7528Node.js\u8fdb\u884c\u5f00\u53d1，\u9996\u5148\u9700\u8981\u5b89\u88c5Node.js\u548cnpm（Node Package Manager，Node\u5305\u7ba1\u7406\u5668）\u3002<\/p>\n

\u5b89\u88c5Node.js：<\/h5>\n

\u8bbf\u95eeNode.js\u5b98\u65b9\u7f51\u7ad9（https:\/\/nodejs.org\/），\u4e0b\u8f7d\u9002\u5408\u60a8\u64cd\u4f5c\u7cfb\u7edf\u7684\u5b89\u88c5\u5305，\u6587\u7ae0\u53d1\u5e03\u7684\u65f6\u5019，\u4e00\u822c\u91c7\u752818，\u6216\u521920\u7248\u672c\u6bd4\u8f83\u7a33\u5b9a\u9002\u5408\u4f01\u4e1a\u5185\u90e8\u5f00\u53d1\u4f7f\u7528\u3002<\/p>\n

\u53cc\u51fb\u5b89\u88c5\u5305，\u6309\u7167\u63d0\u793a\u5b8c\u6210\u5b89\u88c5\u3002<\/p>\n

\u5b89\u88c5\u5b8c\u6210\u540e，\u53ef\u4ee5\u901a\u8fc7\u5728\u547d\u4ee4\u884c\u5de5\u5177\u4e2d\u8f93\u5165node -v\u548cnpm -v\u6765\u9a8c\u8bc1\u5b89\u88c5\u662f\u5426\u6210\u529f\u3002<\/p>\n

npm\u57fa\u7840：<\/h5>\n

npm\u662fNode.js\u7684\u5305\u7ba1\u7406\u5668，\u7528\u4e8e\u5b89\u88c5\u548c\u7ba1\u7406Node.js\u9879\u76ee\u4e2d\u7684\u4f9d\u8d56\u5305\u3002\u901a\u8fc7npm，\u60a8\u53ef\u4ee5\u8f7b\u677e\u5730\u5b89\u88c5\u3001\u66f4\u65b0\u3001\u5378\u8f7d\u548c\u53d1\u5e03Node.js\u5305\u3002<\/p>\n

\u4f7f\u7528npm\u5b89\u88c5\u5305\u7684\u547d\u4ee4\u683c\u5f0f\u901a\u5e38\u4e3anpm install <\u5305\u540d>\u3002\u4f8b\u5982，\u8981\u5b89\u88c5Express\u6846\u67b6，\u53ef\u4ee5\u4f7f\u7528\u547d\u4ee4npm install express\u3002<\/p>\n

\u4e09\u3001\u4f7f\u7528http\u6a21\u5757\u521b\u5efa\u7b2c\u4e00\u4e2aHTTP\u670d\u52a1\u5668<\/h4>\n

Node.js\u5185\u7f6e\u4e86\u4e00\u4e2a\u529f\u80fd\u5f3a\u5927\u7684http\u6a21\u5757，\u5141\u8bb8\u60a8\u8f7b\u677e\u521b\u5efaHTTP\u670d\u52a1\u5668\u3002<\/p>\n

\u521b\u5efaHTTP\u670d\u52a1\u5668\u7684\u6b65\u9aa4：<\/p>\n

1\u3001\u5f15\u5165http\u6a21\u5757：\u4f7f\u7528require\u51fd\u6570\u5f15\u5165Node.js\u5185\u7f6e\u7684http\u6a21\u5757\u3002<\/p>\n

const http = require('http');<\/p>\n

\/** \u521b\u5efaHTTP\u670d\u52a1\u5668：\u4f7f\u7528http.createServer\u65b9\u6cd5\u521b\u5efa\u4e00\u4e2aHTTP\u670d\u52a1\u5668\u3002\u8be5\u65b9\u6cd5\u63a5\u53d7\u4e00\u4e2a\u56de\u8c03\u51fd\u6570，\u8be5\u56de\u8c03\u51fd\u6570\u4f1a\u5728\u6bcf\u6b21\u63a5\u6536\u5230\u8bf7\u6c42\u65f6\u88ab\u8c03\u7528\u3002*\/<\/p>\n

const server = http.createServer((req, res) => {
\n \/** \u8bbe\u7f6e\u54cd\u5e94\u5934 *\/
\n res.writeHead(200, {'Content-Type': 'text\/plain'});<\/p>\n

\/** \u8bbe\u7f6e\u54cd\u5e94\u5185\u5bb9 *\/
\n res.end('Hello, World!\\\\n');<\/p>\n

}); <\/p>\n

2\u3001\u76d1\u542c\u7aef\u53e3：\u4f7f\u7528server.listen\u65b9\u6cd5\u8ba9\u670d\u52a1\u5668\u76d1\u542c\u6307\u5b9a\u7684\u7aef\u53e3\u3002<\/p>\n

server.listen(3000, () => {
\n console.log('\u670d\u52a1\u5668\u8fd0\u884c\u5728 http:\/\/localhost:3000\/');
\n}); <\/p>\n

3\u3001\u542f\u52a8\u670d\u52a1\u5668：\u5728\u547d\u4ee4\u884c\u5de5\u5177\u4e2d\u8fd0\u884c\u5305\u542b\u4e0a\u8ff0\u4ee3\u7801\u7684JavaScript\u6587\u4ef6，\u670d\u52a1\u5668\u5c06\u5f00\u59cb\u76d1\u542c\u6307\u5b9a\u7684\u7aef\u53e3\u3002<\/p>\n

node server.js <\/p>\n

4\u3001\u6d4b\u8bd5\u670d\u52a1\u5668：\u6253\u5f00\u6d4f\u89c8\u5668，\u8bbf\u95eehttp:\/\/localhost:3000\/，\u60a8\u5e94\u8be5\u4f1a\u770b\u5230\u9875\u9762\u663e\u793a\u201cHello, World!\u201d\u3002<\/p>\n

\u56db\u3001\u8c03\u8bd5\u5de5\u5177\u4e0econsole\u65b9\u6cd5\u5b9e\u8df5<\/h4>\n

\u5728Node.js\u5f00\u53d1\u8fc7\u7a0b\u4e2d，\u8c03\u8bd5\u662f\u4e00\u4e2a\u4e0d\u53ef\u6216\u7f3a\u7684\u73af\u8282\u3002Node.js\u63d0\u4f9b\u4e86\u591a\u79cd\u8c03\u8bd5\u5de5\u5177\u548c\u65b9\u6cd5，\u4ece\u7b80\u5355\u7684\u6253\u5370\u65e5\u5fd7\u5230\u590d\u6742\u7684\u8c03\u8bd5\u5668，\u53ef\u4ee5\u6ee1\u8db3\u4e0d\u540c\u573a\u666f\u4e0b\u7684\u8c03\u8bd5\u9700\u6c42\u3002<\/p>\n

console\u65b9\u6cd5\u5b9e\u8df5：<\/h5>\n

Node.js\u7684\u63a7\u5236\u53f0\u5bf9\u8c61（console）\u63d0\u4f9b\u4e86\u591a\u79cd\u65b9\u6cd5\u7528\u4e8e\u8f93\u51fa\u8c03\u8bd5\u4fe1\u606f\u3002\u6700\u5e38\u7528\u7684\u65b9\u6cd5\u5305\u62ec：<\/p>\n

1\u3001console.log()：\u7528\u4e8e\u5728\u63a7\u5236\u53f0\u8f93\u51fa\u4fe1\u606f\u3002\u53ef\u4ee5\u4f20\u9012\u591a\u4e2a\u53c2\u6570，\u63a7\u5236\u53f0\u5c06\u4ee5\u7a7a\u683c\u5206\u9694\u8fd9\u4e9b\u53c2\u6570\u8f93\u51fa\u3002<\/p>\n

console.log('Hello, World!');<\/p>\n

console.log('Number:', 123, 'String:', 'abc'); <\/p>\n

2\u3001console.info()\u3001console.warn()\u3001console.error()：\u8fd9\u4e9b\u65b9\u6cd5\u4e0econsole.log()\u7c7b\u4f3c，\u4f46\u4f1a\u5728\u8f93\u51fa\u4fe1\u606f\u524d\u6dfb\u52a0\u4e0d\u540c\u7684\u6807\u5fd7（\u5982\u8b66\u544a\u6807\u5fd7\u3001\u9519\u8bef\u6807\u5fd7），\u4ee5\u4fbf\u4e8e\u533a\u5206\u4e0d\u540c\u7c7b\u578b\u7684\u8f93\u51fa\u4fe1\u606f\u3002<\/p>\n

console.info('This is an info message.');<\/p>\n

console.warn('This is a warning message.');<\/p>\n

console.error('This is an error message.'); <\/p>\n

3\u3001console.time()\u548cconsole.timeEnd()：\u7528\u4e8e\u7edf\u8ba1\u4e00\u6bb5\u4ee3\u7801\u7684\u8fd0\u884c\u65f6\u95f4\u3002\u901a\u8fc7\u4f20\u9012\u76f8\u540c\u7684\u53c2\u6570\u7ed9\u8fd9\u4e24\u4e2a\u65b9\u6cd5，\u53ef\u4ee5\u5728\u63a7\u5236\u53f0\u8f93\u51fa\u4ee3\u7801\u7684\u8fd0\u884c\u65f6\u95f4\u3002<\/p>\n

console.time('loopTime');
\nfor (let i = 0; i < 1000000; i++) {
\n \/** do something here *\/
\n}
\nconsole.timeEnd('loopTime'); <\/p>\n

4\u3001console.dir()：\u7528\u4e8e\u5c06\u4e00\u4e2a\u5bf9\u8c61\u7684\u4fe1\u606f\u4ee5\u6613\u4e8e\u9605\u8bfb\u7684\u683c\u5f0f\u8f93\u51fa\u5230\u63a7\u5236\u53f0\u3002<\/p>\n

const obj = { name: 'Node.js', version: '18.x' };
\nconsole.dir(obj);
\n\/** \u7528\u4e8e\u8f93\u51fa\u5f53\u524d\u4f4d\u7f6e\u7684\u6808\u4fe1\u606f，\u6709\u52a9\u4e8e\u8ffd\u8e2a\u4ee3\u7801\u7684\u6267\u884c\u8def\u5f84\u548c\u8c03\u8bd5\u590d\u6742\u7684\u95ee\u9898\u3002 *\/
\nconsole.trace('Trace information'); <\/p>\n

\u9664\u4e86\u4e0a\u8ff0console\u65b9\u6cd5\u5916，Node.js\u8fd8\u63d0\u4f9b\u4e86\u5185\u7f6e\u7684\u8c03\u8bd5\u5668\u4ee5\u53ca\u591a\u79cd\u7b2c\u4e09\u65b9\u8c03\u8bd5\u5de5\u5177，\u5982Visual Studio Code\u7684Debugger for Chrome\u63d2\u4ef6\u3001Node Inspector\u7b49\u3002\u8fd9\u4e9b\u5de5\u5177\u63d0\u4f9b\u4e86\u66f4\u4e30\u5bcc\u7684\u8c03\u8bd5\u529f\u80fd，\u5982\u65ad\u70b9\u8c03\u8bd5\u3001\u53d8\u91cf\u76d1\u89c6\u3001\u4ee3\u7801\u8bc4\u4f30\u7b49，\u53ef\u4ee5\u5927\u5927\u63d0\u9ad8\u8c03\u8bd5\u6548\u7387\u3002<\/p>\n<\/p>\n

\u901a\u8fc7\u638c\u63e1Node.js\u7684\u57fa\u672c\u6982\u5ff5\u3001\u4e8b\u4ef6\u9a71\u52a8\u6a21\u578b\u3001\u5b89\u88c5\u4e0enpm\u57fa\u7840\u3001http\u6a21\u5757\u7684\u4f7f\u7528\u4ee5\u53ca\u8c03\u8bd5\u5de5\u5177\u4e0econsole\u65b9\u6cd5\u5b9e\u8df5，\u60a8\u5c06\u80fd\u591f\u66f4\u9ad8\u6548\u5730\u8fdb\u884cNode.js\u5f00\u53d1\u3002<\/p>\n

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