{"id":6200,"date":"2023-01-07T11:37:56","date_gmt":"2023-01-07T03:37:56","guid":{"rendered":"https:\/\/badgameshow.com\/steven\/?p=6200"},"modified":"2023-01-07T11:37:56","modified_gmt":"2023-01-07T03:37:56","slug":"%e4%ba%86%e8%a7%a3%e5%a6%82%e4%bd%95%e4%bd%bf%e7%94%a8node-js%e7%9a%84promises%e4%be%86%e8%99%95%e7%90%86%e5%bc%82%e6%ad%a5%e6%93%8d%e4%bd%9c","status":"publish","type":"post","link":"https:\/\/badgameshow.com\/steven\/node-js\/%e4%ba%86%e8%a7%a3%e5%a6%82%e4%bd%95%e4%bd%bf%e7%94%a8node-js%e7%9a%84promises%e4%be%86%e8%99%95%e7%90%86%e5%bc%82%e6%ad%a5%e6%93%8d%e4%bd%9c\/","title":{"rendered":"\u4e86\u89e3\u5982\u4f55\u4f7f\u7528Node.js\u7684Promises\u4f86\u8655\u7406\u5f02\u6b65\u64cd\u4f5c"},"content":{"rendered":"

<\/p>\n

Node.js \u4e2d\u5982\u4f55\u4f7f\u7528 Promises \u6765\u5904\u7406\u5f02\u6b65\u64cd\u4f5c?<\/h1>\n

Node.js \u662f\u4e00\u500b\u5ee3\u53d7\u6b61\u8fce\u7684 JavaScript \u74b0\u5883\uff0c\u5b83\u53ef\u4ee5\u7528\u65bc\u958b\u767c\u5404\u7a2e\u61c9\u7528\u7a0b\u5e8f\uff0c\u5305\u62ec Web \u548c\u79fb\u52d5\u61c9\u7528\u7a0b\u5e8f\u3002\u5b83\u7684\u512a\u52e2\u5728\u65bc\u5b83\u53ef\u4ee5\u8655\u7406\u5927\u91cf\u7684\u8acb\u6c42\uff0c\u4e26\u4e14\u53ef\u4ee5\u5728\u591a\u500b\u5e73\u53f0\u4e0a\u904b\u884c\u3002\u7136\u800c\uff0c\u7531\u65bc Node.js \u662f\u57fa\u65bc\u4e8b\u4ef6\u9a45\u52d5\u7684\uff0c\u56e0\u6b64\u5b83\u53ef\u80fd\u6703\u5c0e\u81f4\u4e00\u4e9b\u554f\u984c\uff0c\u4f8b\u5982\u7570\u6b65\u64cd\u4f5c\u3002<\/p>\n

\u7570\u6b65\u64cd\u4f5c\u662f\u6307\u5728\u57f7\u884c\u67d0\u4e9b\u64cd\u4f5c\u6642\uff0c\u7a0b\u5e8f\u4e0d\u6703\u7b49\u5f85\u64cd\u4f5c\u5b8c\u6210\uff0c\u800c\u662f\u6703\u7acb\u5373\u8fd4\u56de\uff0c\u4e26\u5728\u64cd\u4f5c\u5b8c\u6210\u5f8c\u518d\u57f7\u884c\u67d0\u4e9b\u64cd\u4f5c\u3002\u9019\u53ef\u80fd\u6703\u5c0e\u81f4\u4e00\u4e9b\u554f\u984c\uff0c\u4f8b\u5982\u7a0b\u5e8f\u57f7\u884c\u6642\u9593\u904e\u9577\uff0c\u6216\u8005\u7a0b\u5e8f\u57f7\u884c\u6642\u51fa\u73fe\u932f\u8aa4\u3002<\/p>\n

\u70ba\u4e86\u89e3\u6c7a\u9019\u500b\u554f\u984c\uff0cNode.js \u63d0\u4f9b\u4e86\u4e00\u7a2e\u53eb\u505a Promises \u7684\u6a5f\u5236\uff0c\u5b83\u53ef\u4ee5\u8b93\u958b\u767c\u8005\u5c07\u7570\u6b65\u64cd\u4f5c\u8f49\u63db\u70ba\u540c\u6b65\u64cd\u4f5c\uff0c\u4ee5\u4fbf\u7a0b\u5e8f\u53ef\u4ee5\u66f4\u5feb\u5730\u57f7\u884c\u3002<\/p>\n

Promises \u662f\u4ec0\u9ebc\uff1f<\/h2>\n

Promises \u662f\u4e00\u7a2e\u7279\u6b8a\u7684 JavaScript \u5c0d\u8c61\uff0c\u5b83\u53ef\u4ee5\u7528\u65bc\u8655\u7406\u7570\u6b65\u64cd\u4f5c\u3002\u5b83\u53ef\u4ee5\u8b93\u958b\u767c\u8005\u5c07\u7570\u6b65\u64cd\u4f5c\u8f49\u63db\u70ba\u540c\u6b65\u64cd\u4f5c\uff0c\u4ee5\u4fbf\u7a0b\u5e8f\u53ef\u4ee5\u66f4\u5feb\u5730\u57f7\u884c\u3002<\/p>\n

Promises \u5c0d\u8c61\u6709\u5169\u500b\u91cd\u8981\u7684\u65b9\u6cd5\uff1aresolve \u548c reject\u3002resolve \u65b9\u6cd5\u7528\u65bc\u6307\u793a\u7570\u6b65\u64cd\u4f5c\u5df2\u6210\u529f\u5b8c\u6210\uff0c\u800c reject \u65b9\u6cd5\u5247\u7528\u65bc\u6307\u793a\u7570\u6b65\u64cd\u4f5c\u5931\u6557\u3002<\/p>\n

Promises \u5c0d\u8c61\u9084\u6709\u4e00\u500b then \u65b9\u6cd5\uff0c\u5b83\u53ef\u4ee5\u7528\u65bc\u6307\u5b9a\u7570\u6b65\u64cd\u4f5c\u5b8c\u6210\u5f8c\u8981\u57f7\u884c\u7684\u64cd\u4f5c\u3002then \u65b9\u6cd5\u63a5\u53d7\u5169\u500b\u53c3\u6578\uff1a\u4e00\u500b\u662f resolve \u65b9\u6cd5\uff0c\u53e6\u4e00\u500b\u662f reject \u65b9\u6cd5\u3002<\/p>\n

\u5982\u4f55\u4f7f\u7528 Promises \u4f86\u8655\u7406\u7570\u6b65\u64cd\u4f5c\uff1f<\/h2>\n

\u4f7f\u7528 Promises \u4f86\u8655\u7406\u7570\u6b65\u64cd\u4f5c\u975e\u5e38\u7c21\u55ae\uff0c\u53ea\u9700\u8981\u5c07\u7570\u6b65\u64cd\u4f5c\u5c01\u88dd\u70ba\u4e00\u500b Promises \u5c0d\u8c61\uff0c\u4e26\u5c07 resolve \u548c reject \u65b9\u6cd5\u50b3\u905e\u7d66 then \u65b9\u6cd5\u5373\u53ef\u3002<\/p>\n

\n\/\/ \u5c01\u88dd\u70ba Promises \u5c0d\u8c61\nlet promise = new Promise((resolve, reject) => {\n    \/\/ \u57f7\u884c\u7570\u6b65\u64cd\u4f5c\n    setTimeout(() => {\n        \/\/ \u7570\u6b65\u64cd\u4f5c\u6210\u529f\n        resolve('Success!');\n    }, 1000);\n});\n\n\/\/ \u5c07 resolve \u548c reject \u65b9\u6cd5\u50b3\u905e\u7d66 then \u65b9\u6cd5\npromise.then(resolve => {\n    \/\/ \u7570\u6b65\u64cd\u4f5c\u6210\u529f\u6642\u57f7\u884c\u7684\u64cd\u4f5c\n    console.log(resolve);\n}, reject => {\n    \/\/ \u7570\u6b65\u64cd\u4f5c\u5931\u6557\u6642\u57f7\u884c\u7684\u64cd\u4f5c\n    console.log(reject);\n});\n<\/pre>\n
\u4e0a\u9762\u7684\u7a0b\u5f0f\u78bc\u4e2d\uff0c\u6211\u5011\u5c07\u7570\u6b65\u64cd\u4f5c\u5c01\u88dd\u70ba\u4e00\u500b Promises \u5c0d\u8c61\uff0c\u4e26\u5c07 resolve \u548c reject \u65b9\u6cd5\u50b3\u905e\u7d66 then \u65b9\u6cd5\u3002\u7576\u7570\u6b65\u64cd\u4f5c\u6210\u529f\u6642\uff0cresolve \u65b9\u6cd5\u5c07\u6703\u88ab\u8abf\u7528\uff0c\u800c\u7576\u7570\u6b65\u64cd\u4f5c\u5931\u6557\u6642\uff0creject \u65b9\u6cd5\u5c07\u6703\u88ab\u8abf\u7528\u3002<\/p>\n
\u4f7f\u7528 Promises \u4f86\u8655\u7406\u7570\u6b65\u64cd\u4f5c\u53ef\u4ee5\u8b93\u7a0b\u5e8f\u66f4\u5feb\u5730\u57f7\u884c\uff0c\u4e26\u4e14\u53ef\u4ee5\u66f4\u597d\u5730\u7ba1\u7406\u7570\u6b65\u64cd\u4f5c\uff0c\u4ee5\u4fbf\u7a0b\u5e8f\u53ef\u4ee5\u66f4\u5feb\u5730\u57f7\u884c\u3002<\/p>\n
<\/p>\n
\u7e3d\u7d50<\/h2>\n
Node.js \u63d0\u4f9b\u4e86\u4e00\u7a2e\u53eb\u505a Promises \u7684\u6a5f\u5236\uff0c\u5b83\u53ef\u4ee5\u8b93\u958b\u767c\u8005\u5c07\u7570\u6b65\u64cd\u4f5c\u8f49\u63db\u70ba\u540c\u6b65\u64cd\u4f5c\uff0c\u4ee5\u4fbf\u7a0b\u5e8f\u53ef\u4ee5\u66f4\u5feb\u5730\u57f7\u884c\u3002\u4f7f\u7528 Promises \u4f86\u8655\u7406\u7570\u6b65\u64cd\u4f5c\u53ef\u4ee5\u8b93\u7a0b\u5e8f\u66f4\u5feb\u5730\u57f7\u884c\uff0c\u4e26\u4e14\u53ef\u4ee5\u66f4\u597d\u5730\u7ba1\u7406\u7570\u6b65\u64cd\u4f5c\uff0c\u4ee5\u4fbf\u7a0b\u5e8f\u53ef\u4ee5\u66f4\u5feb\u5730\u57f7\u884c\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
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