{"id":52769,"date":"2024-12-03T13:21:01","date_gmt":"2024-12-03T05:21:01","guid":{"rendered":"https:\/\/fwq.ai\/blog\/52769\/"},"modified":"2024-12-03T13:21:01","modified_gmt":"2024-12-03T05:21:01","slug":"%e6%9e%84%e5%bb%ba%e6%82%a8%e8%87%aa%e5%b7%b1%e7%9a%84-javascript-%e5%85%bc%e5%ae%b9%e8%af%ad%e8%a8%80%ef%bc%9a%e6%8e%8c%e6%8f%a1%e7%bc%96%e8%af%91%e5%99%a8%e8%ae%be%e8%ae%a1","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/52769\/","title":{"rendered":"\u6784\u5efa\u60a8\u81ea\u5df1\u7684 JavaScript \u517c\u5bb9\u8bed\u8a00\uff1a\u638c\u63e1\u7f16\u8bd1\u5668\u8bbe\u8ba1"},"content":{"rendered":"

<\/b> <\/p>\n

\u6784\u5efa\u60a8\u81ea\u5df1\u7684 JavaScript \u517c\u5bb9\u8bed\u8a00\uff1a\u638c\u63e1\u7f16\u8bd1\u5668\u8bbe\u8ba1<\/h1>\n

<\/i>\u6536\u85cf<\/span> <\/p>\n

\u672c\u7bc7\u6587\u7ae0\u7ed9\u5927\u5bb6\u5206\u4eab\u300a\u6784\u5efa\u60a8\u81ea\u5df1\u7684 JavaScript \u517c\u5bb9\u8bed\u8a00\uff1a\u638c\u63e1\u7f16\u8bd1\u5668\u8bbe\u8ba1\u300b\uff0c\u8986\u76d6\u4e86\u6587\u7ae0\u7684\u5e38\u89c1\u57fa\u7840\u77e5\u8bc6\uff0c\u5176\u5b9e\u4e00\u4e2a\u8bed\u8a00\u7684\u5168\u90e8\u77e5\u8bc6\u70b9\u4e00\u7bc7\u6587\u7ae0\u662f\u4e0d\u53ef\u80fd\u8bf4\u5b8c\u7684\uff0c\u4f46\u5e0c\u671b\u901a\u8fc7\u8fd9\u4e9b\u95ee\u9898\uff0c\u8ba9\u8bfb\u8005\u5bf9\u81ea\u5df1\u7684\u638c\u63e1\u7a0b\u5ea6\u6709\u4e00\u5b9a\u7684\u8ba4\u8bc6(B \u6570)\uff0c\u4ece\u800c\u5f25\u8865\u81ea\u5df1\u7684\u4e0d\u8db3\uff0c\u66f4\u597d\u7684\u638c\u63e1\u5b83\u3002<\/p>\n

\"\u6784\u5efa\u60a8\u81ea\u5df1\u7684<\/p>\n

\u521b\u5efa\u81ea\u5df1\u7684\u53ef\u7f16\u8bd1\u4e3a javascript \u7684\u7f16\u7a0b\u8bed\u8a00\u662f\u4e00\u6bb5\u8ff7\u4eba\u7684\u65c5\u7a0b\u3002\u8fd9\u4e2a\u9879\u76ee\u5c06\u628a\u60a8\u7684\u6280\u80fd\u63a8\u5411\u6781\u9650\uff0c\u5e76\u8ba9\u60a8\u66f4\u6df1\u5165\u5730\u4e86\u89e3\u8bed\u8a00\u7684\u5e95\u5c42\u5de5\u4f5c\u539f\u7406\u3002<\/p>\n

\u8ba9\u6211\u4eec\u4ece\u57fa\u7840\u5f00\u59cb\u3002 javascript \u7684\u81ea\u5b9a\u4e49\u8bed\u8a00\u7f16\u8bd1\u5668\u901a\u5e38\u6d89\u53ca\u4e09\u4e2a\u4e3b\u8981\u9636\u6bb5\uff1a\u8bcd\u6cd5\u5206\u6790\u3001\u89e3\u6790\u548c\u4ee3\u7801\u751f\u6210\u3002<\/p>\n

\u8bcd\u6cd5\u5206\u6790\u662f\u7b2c\u4e00\u6b65\u3002\u5728\u8fd9\u91cc\uff0c\u6211\u4eec\u5c06\u6e90\u4ee3\u7801\u5206\u89e3\u4e3a\u4ee4\u724c\u3002\u8fd9\u4e9b\u662f\u6211\u4eec\u8bed\u8a00\u4e2d\u6700\u5c0f\u7684\u610f\u4e49\u5355\u4f4d\u3002\u4f8b\u5982\uff0c\u5728\u8bed\u53e5\u201clet x = 5;\u201d\u4e2d\uff0c\u6211\u4eec\u6709\u201clet\u201d\u3001\u201cx\u201d\u3001\u201c=\u201d\u3001\u201c5\u201d\u548c\u201c;\u201d\u7684\u6807\u8bb0\u3002<\/p>\n

\u8fd9\u662f\u4e00\u4e2a\u7b80\u5355\u7684 javascript \u8bcd\u6cd5\u5206\u6790\u5668\uff1a<\/p>\n

function lexer(input) {\n    let tokens = [];\n    let current = 0;\n\n    while (current < input.length) {\n        let char = input[current];\n\n        if (char === '=' || char === ';') {\n            tokens.push({ type: 'operator', value: char });\n            current++;\n            continue;\n        }\n\n        if (\/\\s\/.test(char)) {\n            current++;\n            continue;\n        }\n\n        if (\/[a-z]\/i.test(char)) {\n            let value = '';\n            while (\/[a-z]\/i.test(char)) {\n                value += char;\n                char = input[++current];\n            }\n            tokens.push({ type: 'identifier', value });\n            continue;\n        }\n\n        if (\/\\d\/.test(char)) {\n            let value = '';\n            while (\/\\d\/.test(char)) {\n                value += char;\n                char = input[++current];\n            }\n            tokens.push({ type: 'number', value });\n            continue;\n        }\n\n        throw new error('unknown character: ' + char);\n    }\n\n    return tokens;\n}\n<\/pre>\n
\u8fd9\u4e2a\u8bcd\u6cd5\u5206\u6790\u5668\u53ef\u4ee5\u5904\u7406\u7b80\u5355\u7684\u8d4b\u503c\uff0c\u4f8b\u5982\u201clet x = 5;\u201d\u3002\u5b83\u5f88\u57fa\u7840\uff0c\u4f46\u5b83\u8ba9\u60a8\u4e86\u89e3\u8bcd\u6cd5\u5206\u6790\u7684\u5de5\u4f5c\u539f\u7406\u3002<\/p>\n
\u63a5\u4e0b\u6765\u662f\u89e3\u6790\u3002\u8fd9\u662f\u6211\u4eec\u83b7\u53d6\u4ee4\u724c\u6d41\u5e76\u6784\u5efa\u62bd\u8c61\u8bed\u6cd5\u6811\uff08ast\uff09\u7684\u5730\u65b9\u3002 ast \u4ee3\u8868\u4e86\u6211\u4eec\u7a0b\u5e8f\u7684\u7ed3\u6784\u3002<\/p>\n
\u8fd9\u662f\u6211\u4eec\u8bed\u8a00\u7684\u4e00\u4e2a\u7b80\u5355\u89e3\u6790\u5668\uff1a<\/p>\n
function parser(tokens) {\n    let current = 0;\n\n    function walk() {\n        let token = tokens[current];\n\n        if (token.type === 'identifier' && token.value === 'let') {\n            let node = {\n                type: 'variabledeclaration',\n                name: tokens[++current].value,\n                value: null\n            };\n\n            current += 2; \/\/ skip the '='\n            node.value = walk();\n\n            return node;\n        }\n\n        if (token.type === 'number') {\n            current++;\n            return { type: 'numberliteral', value: token.value };\n        }\n\n        throw new typeerror(token.type);\n    }\n\n    let ast = {\n        type: 'program',\n        body: []\n    };\n\n    while (current < tokens.length) {\n        ast.body.push(walk());\n    }\n\n    return ast;\n}\n<\/pre>\n
\u8fd9\u4e2a\u89e3\u6790\u5668\u53ef\u4ee5\u5904\u7406\u7b80\u5355\u7684\u53d8\u91cf\u58f0\u660e\u3002\u5b83\u4e0d\u662f\u5f88\u5f3a\u5927\uff0c\u4f46\u5b83\u8bf4\u660e\u4e86\u8fd9\u4e2a\u6982\u5ff5\u3002<\/p>\n
\u6700\u540e\u4e00\u6b65\u662f\u4ee3\u7801\u751f\u6210\u3002\u8fd9\u662f\u6211\u4eec\u5c06 ast \u8f6c\u6362\u4e3a javascript \u4ee3\u7801\u7684\u5730\u65b9\u3002\u8fd9\u662f\u4e00\u4e2a\u7b80\u5355\u7684\u4ee3\u7801\u751f\u6210\u5668\uff1a<\/p>\n
function codegenerator(node) {\n    switch (node.type) {\n        case 'program':\n            return node.body.map(codegenerator).join('\\n');\n\n        case 'variabledeclaration':\n            return 'let ' + node.name + ' = ' + codegenerator(node.value) + ';';\n\n        case 'numberliteral':\n            return node.value;\n\n        default:\n            throw new typeerror(node.type);\n    }\n}\n<\/pre>\n
\u73b0\u5728\u6211\u4eec\u53ef\u4ee5\u628a\u5b83\u4eec\u653e\u5728\u4e00\u8d77\uff1a<\/p>\n
function compile(input) {\n    let tokens = lexer(input);\n    let ast = parser(tokens);\n    let output = codegenerator(ast);\n    return output;\n}\n\nconsole.log(compile('let x = 5;'));\n\/\/ outputs: let x = 5;\n<\/pre>\n
\u8fd9\u53ea\u662f\u8868\u9762\u73b0\u8c61\u3002\u771f\u6b63\u7684\u8bed\u8a00\u7f16\u8bd1\u5668\u9700\u8981\u5904\u7406\u66f4\u591a\u5185\u5bb9\uff1a\u51fd\u6570\u3001\u63a7\u5236\u7ed3\u6784\u3001\u8fd0\u7b97\u7b26\u7b49\u7b49\u3002\u4f46\u8fd9\u53ef\u4ee5\u8ba9\u60a8\u4f53\u9a8c\u4e00\u4e0b\u6240\u6d89\u53ca\u7684\u5185\u5bb9\u3002<\/p>\n
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\u8ba9\u6211\u4eec\u6dfb\u52a0\u5bf9\u7b80\u5355\u7b97\u672f\u8868\u8fbe\u5f0f\u7684\u652f\u6301\uff1a<\/p>\n
\/\/ add to lexer\nif (char === '+' || char === '-' || char === '*' || char === '\/') {\n    tokens.push({ type: 'operator', value: char });\n    current++;\n    continue;\n}\n\n\/\/ add to parser\nif (token.type === 'number' || token.type === 'identifier') {\n    let node = { type: token.type, value: token.value };\n    current++;\n\n    if (tokens[current] && tokens[current].type === 'operator') {\n        node = {\n            type: 'binaryexpression',\n            operator: tokens[current].value,\n            left: node,\n            right: walk()\n        };\n        current++;\n    }\n\n    return node;\n}\n\n\/\/ add to code generator\ncase 'binaryexpression':\n    return codegenerator(node.left) + ' ' + node.operator + ' ' + codegenerator(node.right);\n\ncase 'identifier':\n    return node.value;\n<\/pre>\n
\u73b0\u5728\u6211\u4eec\u7684\u7f16\u8bd1\u5668\u53ef\u4ee5\u5904\u7406\u50cf\u201clet x = 5 + 3;\u201d\u8fd9\u6837\u7684\u8868\u8fbe\u5f0f\u3002<\/p>\n
\u968f\u7740\u6211\u4eec\u7ee7\u7eed\u6784\u5efa\u6211\u4eec\u7684\u8bed\u8a00\uff0c\u6211\u4eec\u5c06\u9762\u4e34\u6709\u8da3\u7684\u6311\u6218\u3002\u6211\u4eec\u5982\u4f55\u5904\u7406\u8fd0\u7b97\u7b26\u4f18\u5148\u7ea7\uff1f\u6211\u4eec\u5982\u4f55\u5b9e\u73b0 if \u8bed\u53e5\u548c\u5faa\u73af\u7b49\u63a7\u5236\u7ed3\u6784\uff1f\u6211\u4eec\u5982\u4f55\u5904\u7406\u51fd\u6570\u548c\u53d8\u91cf\u8303\u56f4\uff1f<\/p>\n
\u8fd9\u4e9b\u95ee\u9898\u5f15\u5bfc\u6211\u4eec\u8fdb\u5165\u66f4\u9ad8\u7ea7\u7684\u4e3b\u9898\u3002\u6211\u4eec\u53ef\u4ee5\u5b9e\u73b0\u4e00\u4e2a\u7b26\u53f7\u8868\u6765\u8ddf\u8e2a\u53d8\u91cf\u53ca\u5176\u8303\u56f4\u3002\u6211\u4eec\u53ef\u4ee5\u6dfb\u52a0\u7c7b\u578b\u68c0\u67e5\u4ee5\u5728\u8fd0\u884c\u524d\u6355\u83b7\u9519\u8bef\u3002\u6211\u4eec\u751a\u81f3\u53ef\u4ee5\u5b9e\u73b0\u81ea\u5df1\u7684\u8fd0\u884c\u65f6\u73af\u5883\u3002<\/p>\n
\u4e00\u4e2a\u7279\u522b\u6709\u8da3\u7684\u9886\u57df\u662f\u4f18\u5316\u3002\u4e00\u65e6\u6211\u4eec\u6709\u4e86 ast\uff0c\u6211\u4eec\u5c31\u53ef\u4ee5\u5bf9\u5176\u8fdb\u884c\u5206\u6790\u548c\u8f6c\u6362\uff0c\u4ee5\u4f7f\u751f\u6210\u7684\u4ee3\u7801\u66f4\u52a0\u9ad8\u6548\u3002\u4f8b\u5982\uff0c\u6211\u4eec\u53ef\u4ee5\u5b9e\u73b0\u5e38\u91cf\u6298\u53e0\uff0c\u5728\u7f16\u8bd1\u65f6\u8bc4\u4f30\u5e38\u91cf\u8868\u8fbe\u5f0f\uff1a<\/p>\n
function optimize(node) {\n    if (node.type === 'BinaryExpression' &&\n        node.left.type === 'NumberLiteral' &&\n        node.right.type === 'NumberLiteral') {\n        let result;\n        switch (node.operator) {\n            case '+': result = Number(node.left.value) + Number(node.right.value); break;\n            case '-': result = Number(node.left.value) - Number(node.right.value); break;\n            case '*': result = Number(node.left.value) * Number(node.right.value); break;\n            case '\/': result = Number(node.left.value) \/ Number(node.right.value); break;\n        }\n        return { type: 'NumberLiteral', value: result.toString() };\n    }\n    return node;\n}\n<\/pre>\n
\u6211\u4eec\u53ef\u4ee5\u5728\u4ee3\u7801\u751f\u6210\u9636\u6bb5\u5728\u6bcf\u4e2a\u8282\u70b9\u4e0a\u8c03\u7528\u6b64\u51fd\u6570\u3002<\/p>\n
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\u6784\u5efa\u4e00\u79cd\u53ef\u7f16\u8bd1\u4e3a javascript \u7684\u8bed\u8a00\u4e5f\u8ba9\u6211\u4eec\u5bf9 javascript \u672c\u8eab\u6709\u4e86\u72ec\u7279\u7684\u89c6\u89d2\u3002\u6211\u4eec\u5f00\u59cb\u660e\u767d\u4e3a\u4ec0\u4e48\u505a\u51fa\u67d0\u4e9b\u8bbe\u8ba1\u51b3\u7b56\uff0c\u5e76\u4e14\u6211\u4eec\u5bf9\u8bed\u8a00\u7684\u602a\u7656\u548c\u529f\u80fd\u6709\u4e86\u66f4\u6df1\u5165\u7684\u4e86\u89e3\u3002<\/p>\n
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\u503c\u5f97\u6ce8\u610f\u7684\u662f\uff0c\u5f53\u6211\u4eec\u7f16\u8bd1\u4e3a javascript \u65f6\uff0c\u5176\u4e2d\u8bb8\u591a\u539f\u5219\u4e5f\u9002\u7528\u4e8e\u5176\u4ed6\u76ee\u6807\u8bed\u8a00\u3002\u4e00\u65e6\u4e86\u89e3\u4e86\u57fa\u7840\u77e5\u8bc6\uff0c\u60a8\u5c31\u53ef\u4ee5\u8c03\u6574\u7f16\u8bd1\u5668\u4ee5\u8f93\u51fa python\u3001java \u751a\u81f3\u673a\u5668\u4ee3\u7801\u3002<\/p>\n
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\u8bf7\u8bb0\u4f4f\uff0c\u76ee\u6807\u4e0d\u4e00\u5b9a\u662f\u521b\u5efa\u4e0b\u4e00\u4e2a\u5927\u578b\u7f16\u7a0b\u8bed\u8a00\u3002\u771f\u6b63\u7684\u4ef7\u503c\u5728\u4e8e\u65c5\u7a0b\u2014\u2014\u4f60\u83b7\u5f97\u7684\u7406\u89e3\u3001\u4f60\u89e3\u51b3\u7684\u95ee\u9898\u4ee5\u53ca\u4f60\u53d1\u5c55\u7684\u65b0\u601d\u7ef4\u65b9\u5f0f\u3002\u56e0\u6b64\uff0c\u4e0d\u8981\u5bb3\u6015\u5c1d\u8bd5\u3001\u72af\u9519\u8bef\uff0c\u5e76\u7a81\u7834\u4f60\u8ba4\u4e3a\u53ef\u80fd\u7684\u754c\u9650\u3002\u5feb\u4e50\u7f16\u7801\uff01<\/p>\n
\n
 \u6211\u4eec\u7684\u521b\u4f5c <\/h2>\n
\u4e00\u5b9a\u8981\u770b\u770b\u6211\u4eec\u7684\u521b\u4f5c\uff1a<\/p>\n
\u6295\u8d44\u8005\u4e2d\u5fc3<\/strong> | \u667a\u80fd\u751f\u6d3b<\/strong> | \u65f6\u4ee3\u4e0e\u56de\u54cd<\/strong> | \u4ee4\u4eba\u8d39\u89e3\u7684\u8c1c\u56e2<\/strong> | \u5370\u5ea6\u6559<\/strong> | \u7cbe\u82f1\u5f00\u53d1<\/strong> | js\u5b66\u6821<\/strong><\/p>\n
\n
 \u6211\u4eec\u5728\u5a92\u4f53\u4e0a <\/h3>\n
\u79d1\u6280\u8003\u62c9\u6d1e\u5bdf<\/strong> | \u65f6\u4ee3\u4e0e\u56de\u54cd\u4e16\u754c<\/strong> | \u6295\u8d44\u8005\u4e2d\u592e\u5a92\u4f53<\/strong> | \u4ee4\u4eba\u8d39\u89e3\u7684\u8c1c\u56e2<\/strong> | \u79d1\u5b66\u4e0e\u65f6\u4ee3\u5a92\u4ecb<\/strong> | \u73b0\u4ee3\u5370\u5ea6\u6559<\/strong><\/p>\n
\u4ee5\u4e0a\u5c31\u662f\u300a\u6784\u5efa\u60a8\u81ea\u5df1\u7684 JavaScript \u517c\u5bb9\u8bed\u8a00\uff1a\u638c\u63e1\u7f16\u8bd1\u5668\u8bbe\u8ba1\u300b\u7684\u8be6\u7ec6\u5185\u5bb9\uff0c\u66f4\u591a\u5173\u4e8e\u7684\u8d44\u6599\u8bf7\u5173\u6ce8\u7c73\u4e91\u516c\u4f17\u53f7\uff01<\/p>\n
      \u7248\u672c\u58f0\u660e \u672c\u6587\u8f6c\u8f7d\u4e8e\uff1adev.to \u5982\u6709\u4fb5\u72af\uff0c\u8bf7\u8054\u7cfb\u5220\u9664    <\/p>\n
\n
<\/dt>\n
\n   \u4f20Uber\u62df\u6295\u8d44\u5c0f\u9a6c\u667a\u884c\u7f8e\u80a1IPO\n <\/dd>\n<\/dl>\n","protected":false},"excerpt":{"rendered":"
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