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<\/p>\n

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Node.js \u662f\u4e00\u500b\u5efa\u7acb\u5728 JavaScript \u8a9e\u8a00\u57fa\u790e\u4e0a\u7684\u958b\u6e90\u3001\u8de8\u5e73\u53f0\u7684 JavaScript \u74b0\u5883\uff0c\u5b83\u53ef\u4ee5\u7528\u65bc\u958b\u767c\u670d\u52d9\u5668\u7aef\u61c9\u7528\u7a0b\u5e8f\u3002Node.js \u4e2d\u7684 events \u5eab\u662f\u4e00\u500b\u7528\u65bc\u8655\u7406\u4e8b\u4ef6\u7684\u5eab\uff0c\u5b83\u53ef\u4ee5\u8b93\u958b\u767c\u8005\u66f4\u5bb9\u6613\u5730\u8655\u7406\u4e8b\u4ef6\uff0c\u4e26\u66f4\u597d\u5730\u63a7\u5236\u7a0b\u5e8f\u7684\u6d41\u7a0b\u3002\u672c\u6587\u5c07\u4ecb\u7d39\u5982\u4f55\u5728 Node.js \u4e2d\u4f7f\u7528 events \u5eab\u9032\u884c\u4e8b\u4ef6\u8655\u7406\u3002<\/p>\n

\u4ec0\u9ebc\u662f\u4e8b\u4ef6\uff1f<\/h2>\n

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events \u5eab\u662f Node.js \u4e2d\u7684\u4e00\u500b\u6838\u5fc3\u6a21\u584a\uff0c\u5b83\u63d0\u4f9b\u4e86\u4e00\u500b\u7c21\u55ae\u7684 API\uff0c\u53ef\u4ee5\u8b93\u958b\u767c\u8005\u66f4\u5bb9\u6613\u5730\u8655\u7406\u4e8b\u4ef6\u3002\u5b83\u63d0\u4f9b\u4e86\u4e00\u500b EventEmitter \u985e\uff0c\u53ef\u4ee5\u8b93\u958b\u767c\u8005\u8a3b\u518a\u548c\u89f8\u767c\u4e8b\u4ef6\uff0c\u4ee5\u53ca\u4e00\u500b\u4e8b\u4ef6\u8655\u7406\u7a0b\u5e8f\uff0c\u53ef\u4ee5\u8b93\u958b\u767c\u8005\u66f4\u5bb9\u6613\u5730\u8655\u7406\u4e8b\u4ef6\u3002<\/p>\n

\u5982\u4f55\u4f7f\u7528 events \u5eab\uff1f<\/h2>\n

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\n\/\/ \u5f15\u5165 events \u6a21\u7d44\nvar events = require('events');\n\n\/\/ \u5275\u5efa eventEmitter \u5be6\u4f8b\nvar eventEmitter = new events.EventEmitter();\n\n\/\/ \u5275\u5efa\u4e8b\u4ef6\u8655\u7406\u7a0b\u5e8f\nvar connectHandler = function connected() {\n   console.log('\u9023\u63a5\u6210\u529f\u3002');\n  \n   \/\/ \u89f8\u767c data_received \u4e8b\u4ef6 \n   eventEmitter.emit('data_received');\n}\n\n\/\/ \u7d81\u5b9a connection \u4e8b\u4ef6\u5904\u7406\u7a0b\u5e8f\neventEmitter.on('connection', connectHandler);\n \n\/\/ \u4f7f\u7528\u533f\u540d\u51fd\u6578\u7d81\u5b9a data_received \u4e8b\u4ef6\neventEmitter.on('data_received', function(){\n   console.log('\u6578\u64da\u63a5\u6536\u6210\u529f\u3002');\n});\n\n\/\/ \u89f8\u767c connection \u4e8b\u4ef6 \neventEmitter.emit('connection');\n\nconsole.log(\"\u7a0b\u5e8f\u57f7\u884c\u5b8c\u7562\u3002\");\n<\/pre>\n
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