{"id":67955,"date":"2026-01-29T13:05:00","date_gmt":"2026-01-29T05:05:00","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/67955.html"},"modified":"2026-01-29T13:05:00","modified_gmt":"2026-01-29T05:05:00","slug":"typescript%e5%ad%a6%e4%b9%a0-%e7%ac%ac4%e7%ab%a0%ef%bc%9a%e5%87%bd%e6%95%b0%e7%b1%bb%e5%9e%8b","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/67955.html","title":{"rendered":"TypeScript\u5b66\u4e60-\u7b2c4\u7ae0\uff1a\u51fd\u6570\u7c7b\u578b"},"content":{"rendered":"

TypeScript\u5b66\u4e60-\u7b2c4\u7ae0：\u51fd\u6570\u7c7b\u578b<\/h2>\n

\u5404\u4f4d\u524d\u7aef\u5de5\u53cb\u4eec，\u4e0a\u4e00\u7ae0\u54b1\u4eec\u641e\u5b9a\u4e86\u590d\u5408\u7c7b\u578b，\u76f8\u5f53\u4e8e\u628aTS\u4e16\u754c\u91cc\u7684\u201c\u96f6\u4ef6\u201d\u548c\u201c\u7ec4\u88c5\u4ef6\u201d\u90fd\u6478\u6e05\u4e86\u3002\u800c\u51fd\u6570，\u5c31\u662f\u64cd\u63a7\u8fd9\u4e9b\u201c\u7ec4\u88c5\u4ef6\u201d\u5e72\u6d3b\u7684\u201c\u6267\u884c\u8005\u201d\u2014\u2014\u4e0d\u7ba1\u662f\u5904\u7406\u6570\u636e\u3001\u53d1\u8d77\u8bf7\u6c42，\u8fd8\u662f\u6e32\u67d3\u9875\u9762，\u672c\u8d28\u90fd\u662f\u9760\u51fd\u6570\u6765\u843d\u5730\u903b\u8f91\u3002<\/p>\n

\u4f46JS\u91cc\u7684\u51fd\u6570\u5c31\u50cf\u201c\u91ce\u751f\u6267\u884c\u8005\u201d，\u53c2\u6570\u4f20\u5565\u3001\u8fd4\u56de\u5565\u5168\u51ed\u81ea\u89c9，\u5f88\u5bb9\u6613\u51fa\u73b0\u201c\u4f20\u9519\u53c2\u6570\u7c7b\u578b\u201d\u201c\u8fd4\u56de\u503c\u4e0d\u7b26\u5408\u9884\u671f\u201d\u7684bug\u3002\u8fd9\u4e00\u7ae0\u54b1\u4eec\u5c31\u7ed9\u51fd\u6570\u201c\u7acb\u89c4\u77e9\u201d，\u5403\u900f\u51fd\u6570\u7c7b\u578b\u7684\u7cbe\u51c6\u7ea6\u675f，\u8ba9\u6bcf\u4e00\u4e2a\u201c\u6267\u884c\u8005\u201d\u90fd\u6309\u89c4\u5219\u5e72\u6d3b，\u65e2\u7075\u6d3b\u53c8\u4e0d\u8dd1\u504f\u3002<\/p>\n

\u4e00\u3001\u51fd\u6570\u7684\u7c7b\u578b\u6807\u6ce8：\u7ed9\u6267\u884c\u8005\u5b9a\u201c\u5de5\u4f5c\u624b\u518c\u201d<\/h3>\n

\u51fd\u6570\u7684\u7c7b\u578b\u6807\u6ce8\u6838\u5fc3\u5c31\u4e24\u4ef6\u4e8b：\u7ea6\u675f\u201c\u8f93\u5165\u201d（\u53c2\u6570）\u548c\u201c\u8f93\u51fa\u201d（\u8fd4\u56de\u503c）\u3002\u76f8\u5f53\u4e8e\u7ed9\u6267\u884c\u8005\u4e00\u672c\u5de5\u4f5c\u624b\u518c，\u660e\u786e\u89c4\u5b9a\u201c\u8981\u63a5\u6536\u4ec0\u4e48\u7c7b\u578b\u7684\u4efb\u52a1（\u53c2\u6570）\u201d\u201c\u5b8c\u6210\u540e\u8981\u8fd4\u56de\u4ec0\u4e48\u7c7b\u578b\u7684\u7ed3\u679c（\u8fd4\u56de\u503c）\u201d\u3002\u54b1\u4eec\u5206\u666e\u901a\u51fd\u6570\u548c\u7bad\u5934\u51fd\u6570\u4e24\u79cd\u573a\u666f\u6765\u8bb2，\u8986\u76d6\u65e5\u5e38\u5f00\u53d1\u5168\u90e8\u7528\u6cd5\u3002<\/p>\n

1. \u666e\u901a\u51fd\u6570：\u5b8c\u6574\u6807\u6ce8\u683c\u5f0f<\/h4>\n

\u666e\u901a\u51fd\u6570\u7684\u6807\u6ce8\u8bed\u6cd5\u5f88\u6e05\u6670：\u53c2\u6570\u5217\u8868\u91cc\u7ed9\u6bcf\u4e2a\u53c2\u6570\u52a0\u7c7b\u578b，\u51fd\u6570\u540d\u540e\u52a0:\u548c\u8fd4\u56de\u503c\u7c7b\u578b（\u65e0\u8fd4\u56de\u503c\u7528void）\u3002<\/p>\n

\/\/ \u51fd\u6570：\u63a5\u6536\u4e24\u4e2anumber\u7c7b\u578b\u53c2\u6570，\u8fd4\u56denumber\u7c7b\u578b\u7ed3\u679c<\/span>
\nfunction<\/span> add<\/span>(<\/span>a:<\/span> number<\/span>,<\/span> b:<\/span> number<\/span>)<\/span>:<\/span> number<\/span> {<\/span>
\n return<\/span> a +<\/span> b;<\/span>
\n}<\/span><\/p>\n

\/\/ \u6b63\u786e\u8c03\u7528：\u53c2\u6570\u7c7b\u578b\u3001\u6570\u91cf\u5b8c\u5168\u5339\u914d<\/span>
\nconst<\/span> result =<\/span> add<\/span>(<\/span>10<\/span>,<\/span> 20<\/span>)<\/span>;<\/span> \/\/ result\u88ab\u63a8\u5bfc\u4e3anumber\u7c7b\u578b<\/span><\/p>\n

\/\/ \u9519\u8bef\u793a\u4f8b：\u53c2\u6570\u7c7b\u578b\u4e0d\u5339\u914d<\/span>
\n\/\/ add(10, "20"); \/\/ \u62a5\u9519：\u9884\u671fnumber，\u5b9e\u9645string<\/span><\/p>\n

\/\/ \u65e0\u8fd4\u56de\u503c\u51fd\u6570：\u8fd4\u56de\u503c\u7c7b\u578b\u6807\u4e3avoid<\/span>
\nfunction<\/span> printLog<\/span>(<\/span>msg:<\/span> string<\/span>)<\/span>:<\/span> void<\/span> {<\/span>
\n console<\/span>.<\/span>log<\/span>(<\/span>msg)<\/span>;<\/span>
\n \/\/ \u53ef\u7701\u7565return，\u6216return undefined<\/span>
\n \/\/ return; \/\/ \u5408\u6cd5<\/span>
\n \/\/ return undefined; \/\/ \u5408\u6cd5<\/span>
\n \/\/ return 10; \/\/ \u62a5\u9519：\u4e0d\u80fd\u8fd4\u56denumber，\u9884\u671fvoid<\/span>
\n}<\/span><\/p>\n

\u907f\u5751\u70b9：void\u8868\u793a\u201c\u65e0\u8fd4\u56de\u503c\u201d，\u4e0d\u662f\u201c\u8fd4\u56deundefined\u201d\u2014\u2014\u867d\u7136\u51fd\u6570\u9ed8\u8ba4\u8fd4\u56deundefined，\u4f46\u6807\u6ce8\u4e3avoid\u540e，\u5c31\u4e0d\u80fd\u8fd4\u56de\u4efb\u4f55\u6709\u610f\u4e49\u7684\u503c，\u5f3a\u884c\u8fd4\u56de\u4f1a\u62a5\u9519\u3002<\/p>\n

2. \u7bad\u5934\u51fd\u6570：\u7b80\u5316\u5f0f\u6807\u6ce8<\/h4>\n

\u7bad\u5934\u51fd\u6570\u7684\u6807\u6ce8\u903b\u8f91\u548c\u666e\u901a\u51fd\u6570\u4e00\u81f4，\u53ea\u662f\u8bed\u6cd5\u66f4\u7b80\u6d01，\u9002\u5408\u533f\u540d\u51fd\u6570\u3001\u56de\u8c03\u51fd\u6570\u573a\u666f\u3002\u6709\u4e24\u79cd\u5e38\u89c1\u5199\u6cd5，\u6309\u9700\u9009\u62e9：<\/p>\n

\/\/ \u5199\u6cd51：\u76f4\u63a5\u5728\u53c2\u6570\u548c\u7bad\u5934\u540e\u6807\u6ce8\u8fd4\u56de\u503c\u7c7b\u578b<\/span>
\nconst<\/span> multiply =<\/span> (<\/span>a:<\/span> number<\/span>,<\/span> b:<\/span> number<\/span>)<\/span>:<\/span> number<\/span> =><\/span> a *<\/span> b;<\/span><\/p>\n

\/\/ \u5199\u6cd52：\u7ed9\u7bad\u5934\u51fd\u6570\u6574\u4f53\u6807\u6ce8\u7c7b\u578b（\u7ed3\u5408\u7c7b\u578b\u522b\u540d\u66f4\u4f18\u96c5，\u540e\u7eed\u4f1a\u8bb2）<\/span>
\ntype<\/span> MultiplyFn<\/span> =<\/span> (<\/span>a:<\/span> number<\/span>,<\/span> b:<\/span> number<\/span>)<\/span> =><\/span> number<\/span>;<\/span>
\nconst<\/span> multiply2:<\/span> MultiplyFn<\/span> =<\/span> (<\/span>a,<\/span> b)<\/span> =><\/span> a *<\/span> b;<\/span><\/p>\n

\/\/ \u65e0\u8fd4\u56de\u503c\u7bad\u5934\u51fd\u6570<\/span>
\nconst<\/span> printMsg =<\/span> (<\/span>msg:<\/span> string<\/span>)<\/span>:<\/span> void<\/span> =><\/span> console<\/span>.<\/span>log<\/span>(<\/span>msg)<\/span>;<\/span><\/p>\n

\u5c0f\u6280\u5de7：\u7bad\u5934\u51fd\u6570\u5728\u4f5c\u4e3a\u56de\u8c03\u65f6，\u6807\u6ce8\u4f1a\u66f4\u7b80\u6d01，\u6bd4\u5982\u6570\u7ec4\u7684map\u65b9\u6cd5：<\/p>\n

const<\/span> numbers:<\/span> number<\/span>[<\/span>]<\/span> =<\/span> [<\/span>1<\/span>,<\/span> 2<\/span>,<\/span> 3<\/span>]<\/span>;<\/span>
\n\/\/ map\u56de\u8c03：\u53c2\u6570n\u662fnumber，\u8fd4\u56destring，\u63a8\u5bfcresult\u4e3astring[]<\/span>
\nconst<\/span> numberStrs =<\/span> numbers.<\/span>map<\/span>(<\/span>(<\/span>n:<\/span> number<\/span>)<\/span>:<\/span> string<\/span> =><\/span> `<\/span>\u6570\u5b57：<\/span>${<\/span>n}<\/span><\/span>`<\/span><\/span>)<\/span>;<\/span><\/p>\n

\u4e8c\u3001\u53ef\u9009\u53c2\u6570\u4e0e\u9ed8\u8ba4\u53c2\u6570：\u7ed9\u6267\u884c\u8005\u7559\u201c\u7075\u6d3b\u7a7a\u95f4\u201d<\/h3>\n

\u5b9e\u9645\u5f00\u53d1\u4e2d，\u5f88\u591a\u51fd\u6570\u7684\u53c2\u6570\u4e0d\u662f\u5fc5\u586b\u7684（\u6bd4\u5982\u7b5b\u9009\u5217\u8868\u7684\u9ed8\u8ba4\u6761\u4ef6），\u8fd9\u65f6\u5019\u5c31\u9700\u8981\u53ef\u9009\u53c2\u6570\u548c\u9ed8\u8ba4\u53c2\u6570，\u7ed9\u6267\u884c\u8005\u7559\u8db3\u7075\u6d3b\u5ea6，\u4f46\u540c\u65f6\u8981\u4fdd\u6301\u7c7b\u578b\u7ea6\u675f\u3002<\/p>\n

1. \u53ef\u9009\u53c2\u6570：\u7528?\u6807\u8bb0\u201c\u975e\u5fc5\u586b\u4efb\u52a1\u201d<\/h4>\n

\u5728\u53c2\u6570\u540d\u540e\u52a0?，\u8868\u793a\u8be5\u53c2\u6570\u53ef\u9009\u2014\u2014\u8c03\u7528\u51fd\u6570\u65f6\u53ef\u4ee5\u4f20，\u4e5f\u53ef\u4ee5\u4e0d\u4f20\u3002\u4f46\u6709\u4e2a\u786c\u6027\u89c4\u5219：\u53ef\u9009\u53c2\u6570\u5fc5\u987b\u653e\u5728\u5fc5\u9009\u53c2\u6570\u540e\u9762\u3002<\/p>\n

\/\/ \u53ef\u9009\u53c2\u6570b：number\u7c7b\u578b，\u53ef\u4f20\u53ef\u4e0d\u4f20<\/span>
\nfunction<\/span> calculate<\/span>(<\/span>a:<\/span> number<\/span>,<\/span> b?<\/span>:<\/span> number<\/span>)<\/span>:<\/span> number<\/span> {<\/span>
\n \/\/ \u53ef\u9009\u53c2\u6570\u53ef\u80fd\u4e3aundefined，\u9700\u5148\u5224\u65ad\u518d\u4f7f\u7528<\/span>
\n return<\/span> b ?<\/span> a +<\/span> b :<\/span> a;<\/span>
\n}<\/span><\/p>\n

\/\/ \u6b63\u786e\u8c03\u7528\u65b9\u5f0f<\/span>
\ncalculate<\/span>(<\/span>10<\/span>)<\/span>;<\/span> \/\/ \u53ea\u4f20\u5fc5\u9009\u53c2\u6570，b\u4e3aundefined<\/span>
\ncalculate<\/span>(<\/span>10<\/span>,<\/span> 20<\/span>)<\/span>;<\/span> \/\/ \u4f20\u5fc5\u9009+\u53ef\u9009\u53c2\u6570<\/span><\/p>\n

\/\/ \u9519\u8bef\u793a\u4f8b：\u53ef\u9009\u53c2\u6570\u653e\u5fc5\u9009\u53c2\u6570\u524d\u9762<\/span>
\n\/\/ function wrongCalculate(b?: number, a: number): number { … } \/\/ \u62a5\u9519<\/span><\/p>\n

\u907f\u5751\u70b9：\u53ef\u9009\u53c2\u6570\u7684\u7c7b\u578b\u4f1a\u81ea\u52a8\u63a8\u5bfc\u4e3a\u201c\u5bf9\u5e94\u7c7b\u578b | undefined\u201d，\u6240\u4ee5\u5fc5\u987b\u5148\u5224\u65ad\u662f\u5426\u5b58\u5728，\u518d\u4f7f\u7528，\u907f\u514d\u8fd0\u884c\u65f6\u9519\u8bef\u3002<\/p>\n

2. \u9ed8\u8ba4\u53c2\u6570：\u7ed9\u201c\u53ef\u9009\u4efb\u52a1\u201d\u8bbe\u201c\u9ed8\u8ba4\u503c\u201d<\/h4>\n

\u5982\u679c\u53ef\u9009\u53c2\u6570\u6709\u9ed8\u8ba4\u503c，\u53ef\u4ee5\u76f4\u63a5\u5728\u53c2\u6570\u5217\u8868\u91cc\u8d4b\u503c，\u6b64\u65f6\u53c2\u6570\u4f1a\u81ea\u52a8\u88ab\u89c6\u4e3a\u53ef\u9009\u53c2\u6570，\u65e0\u9700\u518d\u52a0?\u3002\u540c\u65f6，\u9ed8\u8ba4\u53c2\u6570\u7684\u7c7b\u578b\u4f1a\u81ea\u52a8\u63a8\u5bfc，\u4e5f\u53ef\u4ee5\u624b\u52a8\u6807\u6ce8\u3002<\/p>\n

\/\/ \u9ed8\u8ba4\u53c2\u6570c：\u9ed8\u8ba4\u503c\u4e3a10，\u7c7b\u578b\u81ea\u52a8\u63a8\u5bfc\u4e3anumber<\/span>
\nfunction<\/span> addWithDefault<\/span>(<\/span>a:<\/span> number<\/span>,<\/span> b:<\/span> number<\/span>,<\/span> c =<\/span> 10<\/span>)<\/span>:<\/span> number<\/span> {<\/span>
\n return<\/span> a +<\/span> b +<\/span> c;<\/span>
\n}<\/span><\/p>\n

\/\/ \u6b63\u786e\u8c03\u7528\u65b9\u5f0f<\/span>
\naddWithDefault<\/span>(<\/span>1<\/span>,<\/span> 2<\/span>)<\/span>;<\/span> \/\/ c\u4f7f\u7528\u9ed8\u8ba4\u503c10，\u7ed3\u679c13<\/span>
\naddWithDefault<\/span>(<\/span>1<\/span>,<\/span> 2<\/span>,<\/span> 20<\/span>)<\/span>;<\/span> \/\/ \u8986\u76d6\u9ed8\u8ba4\u503c，\u7ed3\u679c23<\/span><\/p>\n

\/\/ \u624b\u52a8\u6807\u6ce8\u9ed8\u8ba4\u53c2\u6570\u7c7b\u578b（\u9002\u5408\u9ed8\u8ba4\u503c\u4e3a\u590d\u6742\u7c7b\u578b\u65f6）<\/span>
\nfunction<\/span> greet<\/span>(<\/span>name:<\/span> string<\/span>,<\/span> greeting:<\/span> string<\/span> =<\/span> "Hello"<\/span>)<\/span>:<\/span> string<\/span> {<\/span>
\n return<\/span> `<\/span>${<\/span>greeting}<\/span><\/span>, <\/span>${<\/span>name}<\/span><\/span>`<\/span><\/span>;<\/span>
\n}<\/span><\/p>\n

\u5c0f\u6280\u5de7：\u9ed8\u8ba4\u53c2\u6570\u53ef\u4ee5\u653e\u5728\u5fc5\u9009\u53c2\u6570\u4e2d\u95f4，\u4f46\u8c03\u7528\u65f6\u5982\u679c\u8981\u8df3\u8fc7\u9ed8\u8ba4\u53c2\u6570，\u9700\u8981\u4f20undefined（\u4e0d\u63a8\u8350，\u6613\u6df7\u6dc6，\u5efa\u8bae\u9ed8\u8ba4\u53c2\u6570\u90fd\u653e\u6700\u540e）\u3002<\/p>\n

\u4e09\u3001\u5269\u4f59\u53c2\u6570：\u8ba9\u6267\u884c\u8005\u201c\u7075\u6d3b\u63a5\u6536\u6279\u91cf\u4efb\u52a1\u201d<\/h3>\n

\u6709\u4e9b\u573a\u666f\u4e0b，\u51fd\u6570\u7684\u53c2\u6570\u6570\u91cf\u4e0d\u56fa\u5b9a（\u6bd4\u5982\u6c42\u548c\u51fd\u6570，\u53ef\u4f20\u4efb\u610f\u4e2a\u6570\u5b57），\u8fd9\u65f6\u5019\u5c31\u9700\u8981\u5269\u4f59\u53c2\u6570\u2014\u2014\u7528…\u6807\u8bb0，\u63a5\u6536\u6240\u6709\u5269\u4f59\u7684\u53c2\u6570，\u5e76\u5b58\u4e3a\u4e00\u4e2a\u6570\u7ec4\u3002<\/p>\n

\/\/ \u5269\u4f59\u53c2\u6570args：\u63a5\u6536\u6240\u6709\u540e\u7eed\u53c2\u6570，\u7c7b\u578b\u4e3anumber[]<\/span>
\nfunction<\/span> sum<\/span>(<\/span>…<\/span>args:<\/span> number<\/span>[<\/span>]<\/span>)<\/span>:<\/span> number<\/span> {<\/span>
\n return<\/span> args.<\/span>reduce<\/span>(<\/span>(<\/span>total,<\/span> curr)<\/span> =><\/span> total +<\/span> curr,<\/span> 0<\/span>)<\/span>;<\/span>
\n}<\/span><\/p>\n

\/\/ \u6b63\u786e\u8c03\u7528：\u4f20\u4efb\u610f\u4e2anumber\u7c7b\u578b\u53c2\u6570<\/span>
\nsum<\/span>(<\/span>1<\/span>)<\/span>;<\/span> \/\/ \u7ed3\u679c1<\/span>
\nsum<\/span>(<\/span>1<\/span>,<\/span> 2<\/span>,<\/span> 3<\/span>)<\/span>;<\/span> \/\/ \u7ed3\u679c6<\/span>
\nsum<\/span>(<\/span>10<\/span>,<\/span> 20<\/span>,<\/span> 30<\/span>,<\/span> 40<\/span>)<\/span>;<\/span> \/\/ \u7ed3\u679c100<\/span><\/p>\n

\/\/ \u5269\u4f59\u53c2\u6570\u7ed3\u5408\u5fc5\u9009\u53c2\u6570<\/span>
\nfunction<\/span> joinStr<\/span>(<\/span>separator:<\/span> string<\/span>,<\/span> …<\/span>strs:<\/span> string<\/span>[<\/span>]<\/span>)<\/span>:<\/span> string<\/span> {<\/span>
\n return<\/span> strs.<\/span>join<\/span>(<\/span>separator)<\/span>;<\/span>
\n}<\/span>
\njoinStr<\/span>(<\/span>"-"<\/span>,<\/span> "a"<\/span>,<\/span> "b"<\/span>,<\/span> "c"<\/span>)<\/span>;<\/span> \/\/ \u7ed3\u679c"a-b-c"<\/span><\/p>\n

\u907f\u5751\u70b9：\u5269\u4f59\u53c2\u6570\u5fc5\u987b\u662f\u51fd\u6570\u7684\u6700\u540e\u4e00\u4e2a\u53c2\u6570，\u4e14\u7c7b\u578b\u53ea\u80fd\u662f\u6570\u7ec4\u7c7b\u578b（\u6bd4\u5982number[]\u3001string[]），\u4e0d\u80fd\u662f\u5355\u4e2a\u7c7b\u578b\u3002<\/p>\n

\u56db\u3001\u51fd\u6570\u91cd\u8f7d：\u7ed9\u6267\u884c\u8005\u914d\u201c\u591a\u5957\u5de5\u4f5c\u624b\u518c\u201d<\/h3>\n

\u6709\u4e9b\u51fd\u6570\u9700\u8981\u5904\u7406\u4e0d\u540c\u7c7b\u578b\/\u6570\u91cf\u7684\u53c2\u6570，\u8fd4\u56de\u4e0d\u540c\u7c7b\u578b\u7684\u7ed3\u679c（\u6bd4\u5982\u201c\u83b7\u53d6\u7528\u6237\u4fe1\u606f\u201d，\u4f20ID\u8fd4\u56de\u5355\u4e2a\u7528\u6237，\u4f20\u6570\u7ec4ID\u8fd4\u56de\u7528\u6237\u5217\u8868）\u3002\u8fd9\u65f6\u5019\u5c31\u9700\u8981\u51fd\u6570\u91cd\u8f7d\u2014\u2014\u4e3a\u540c\u4e00\u4e2a\u51fd\u6570\u5b9a\u4e49\u591a\u4e2a\u201c\u7c7b\u578b\u7b7e\u540d\u201d，\u8ba9\u51fd\u6570\u6839\u636e\u5165\u53c2\u81ea\u52a8\u5339\u914d\u5bf9\u5e94\u7684\u7ea6\u675f\u89c4\u5219\u3002<\/p>\n

\u51fd\u6570\u91cd\u8f7d\u7684\u6838\u5fc3\u662f\u201c\u5148\u58f0\u660e，\u540e\u5b9e\u73b0\u201d：\u5148\u5b9a\u4e49\u591a\u4e2a\u7c7b\u578b\u7b7e\u540d，\u518d\u5199\u4e00\u4e2a\u517c\u5bb9\u6240\u6709\u7b7e\u540d\u7684\u51fd\u6570\u5b9e\u73b0\u3002<\/p>\n

\/\/ 1. \u5b9a\u4e49\u51fd\u6570\u91cd\u8f7d\u7b7e\u540d（\u591a\u5957\u5de5\u4f5c\u624b\u518c）<\/span>
\nfunction<\/span> getUser<\/span>(<\/span>id:<\/span> number<\/span>)<\/span>:<\/span> {<\/span> id:<\/span> number<\/span>;<\/span> name:<\/span> string<\/span> }<\/span>;<\/span> \/\/ \u4f20number，\u8fd4\u56de\u5355\u4e2a\u7528\u6237<\/span>
\nfunction<\/span> getUser<\/span>(<\/span>ids:<\/span> number<\/span>[<\/span>]<\/span>)<\/span>:<\/span> {<\/span> id:<\/span> number<\/span>;<\/span> name:<\/span> string<\/span> }<\/span>[<\/span>]<\/span>;<\/span> \/\/ \u4f20number[]，\u8fd4\u56de\u7528\u6237\u5217\u8868<\/span><\/p>\n

\/\/ 2. \u5b9e\u73b0\u51fd\u6570（\u517c\u5bb9\u6240\u6709\u7b7e\u540d，\u9700\u5904\u7406\u6240\u6709\u573a\u666f）<\/span>
\nfunction<\/span> getUser<\/span>(<\/span>idOrIds:<\/span> number<\/span> |<\/span> number<\/span>[<\/span>]<\/span>)<\/span>:<\/span> {<\/span> id:<\/span> number<\/span>;<\/span> name:<\/span> string<\/span> }<\/span> |<\/span> {<\/span> id:<\/span> number<\/span>;<\/span> name:<\/span> string<\/span> }<\/span>[<\/span>]<\/span> {<\/span>
\n if<\/span> (<\/span>typeof<\/span> idOrIds ===<\/span> "number"<\/span>)<\/span> {<\/span>
\n \/\/ \u5904\u7406\u5355\u4e2aID\u573a\u666f<\/span>
\n return<\/span> {<\/span> id:<\/span> idOrIds,<\/span> name:<\/span> `<\/span>\u7528\u6237<\/span>${<\/span>idOrIds}<\/span><\/span>`<\/span><\/span> }<\/span>;<\/span>
\n }<\/span> else<\/span> {<\/span>
\n \/\/ \u5904\u7406ID\u6570\u7ec4\u573a\u666f<\/span>
\n return<\/span> idOrIds.<\/span>map<\/span>(<\/span>id =><\/span> (<\/span>{<\/span> id,<\/span> name:<\/span> `<\/span>\u7528\u6237<\/span>${<\/span>id}<\/span><\/span>`<\/span><\/span> }<\/span>)<\/span>)<\/span>;<\/span>
\n }<\/span>
\n}<\/span><\/p>\n

\/\/ \u6b63\u786e\u8c03\u7528：\u81ea\u52a8\u5339\u914d\u5bf9\u5e94\u7b7e\u540d<\/span>
\nconst<\/span> user =<\/span> getUser<\/span>(<\/span>1001<\/span>)<\/span>;<\/span> \/\/ \u5339\u914d\u7b2c\u4e00\u4e2a\u7b7e\u540d，\u8fd4\u56de\u5355\u4e2a\u7528\u6237<\/span>
\nconst<\/span> userList =<\/span> getUser<\/span>(<\/span>[<\/span>1001<\/span>,<\/span> 1002<\/span>]<\/span>)<\/span>;<\/span> \/\/ \u5339\u914d\u7b2c\u4e8c\u4e2a\u7b7e\u540d，\u8fd4\u56de\u7528\u6237\u5217\u8868<\/span><\/p>\n

\/\/ \u9519\u8bef\u793a\u4f8b：\u65e0\u5bf9\u5e94\u7b7e\u540d<\/span>
\n\/\/ getUser("1001"); \/\/ \u62a5\u9519：\u65e0\u63a5\u6536string\u7c7b\u578b\u7684\u7b7e\u540d<\/span><\/p>\n

\u907f\u5751\u70b9：\u51fd\u6570\u5b9e\u73b0\u7684\u53c2\u6570\u7c7b\u578b\u548c\u8fd4\u56de\u503c\u7c7b\u578b，\u5fc5\u987b\u517c\u5bb9\u6240\u6709\u91cd\u8f7d\u7b7e\u540d，\u4e0d\u80fd\u9057\u6f0f\u4efb\u4f55\u4e00\u79cd\u573a\u666f\u3002\u540c\u65f6，\u91cd\u8f7d\u7b7e\u540d\u8981\u7cbe\u51c6\u533a\u5206，\u907f\u514d\u6a21\u7cca\u51b2\u7a81（\u6bd4\u5982\u4e24\u4e2a\u7b7e\u540d\u53c2\u6570\u6570\u91cf\u76f8\u540c\u3001\u7c7b\u578b\u517c\u5bb9，TS\u65e0\u6cd5\u533a\u5206）\u3002<\/p>\n

\u4e94\u3001\u7c7b\u578b\u522b\u540d：\u7ed9\u51fd\u6570\u7c7b\u578b\u201c\u8d77\u522b\u540d\u201d，\u63d0\u5347\u590d\u7528\u6027<\/h3>\n

\u5982\u679c\u591a\u4e2a\u51fd\u6570\u7684\u7c7b\u578b\u7b7e\u540d\u76f8\u540c（\u6bd4\u5982\u591a\u4e2a\u56de\u8c03\u51fd\u6570\u90fd\u662f\u201c\u63a5\u6536number，\u8fd4\u56destring\u201d），\u53cd\u590d\u5199\u5b8c\u6574\u7c7b\u578b\u4f1a\u5f88\u5197\u4f59\u3002\u8fd9\u65f6\u5019\u53ef\u4ee5\u7528type\u7ed9\u51fd\u6570\u7c7b\u578b\u8d77\u522b\u540d，\u5b9e\u73b0\u7c7b\u578b\u590d\u7528\u3002<\/p>\n

\/\/ \u5b9a\u4e49\u51fd\u6570\u7c7b\u578b\u522b\u540d：\u63a5\u6536number，\u8fd4\u56destring<\/span>
\ntype<\/span> NumberToStringFn<\/span> =<\/span> (<\/span>num:<\/span> number<\/span>)<\/span> =><\/span> string<\/span>;<\/span><\/p>\n

\/\/ \u590d\u7528\u522b\u540d\u5b9a\u4e49\u51fd\u6570<\/span>
\nconst<\/span> formatNum:<\/span> NumberToStringFn<\/span> =<\/span> (<\/span>num)<\/span> =><\/span> `<\/span>\u6570\u5b57：<\/span>${<\/span>num}<\/span><\/span>`<\/span><\/span>;<\/span>
\nconst<\/span> convertNum:<\/span> NumberToStringFn<\/span> =<\/span> (<\/span>num)<\/span> =><\/span> num.<\/span>toString<\/span>(<\/span>)<\/span>;<\/span><\/p>\n

\/\/ \u522b\u540d\u4e5f\u53ef\u7528\u4e8e\u51fd\u6570\u53c2\u6570（\u6bd4\u5982\u56de\u8c03\u51fd\u6570\u53c2\u6570）<\/span>
\nfunction<\/span> processNumber<\/span>(<\/span>num:<\/span> number<\/span>,<\/span> callback:<\/span> NumberToStringFn)<\/span>:<\/span> string<\/span> {<\/span>
\n return<\/span> callback<\/span>(<\/span>num)<\/span>;<\/span>
\n}<\/span><\/p>\n

\/\/ \u8c03\u7528：\u56de\u8c03\u51fd\u6570\u81ea\u52a8\u5339\u914d\u522b\u540d\u7c7b\u578b<\/span>
\nprocessNumber<\/span>(<\/span>10<\/span>,<\/span> (<\/span>num)<\/span> =><\/span> `<\/span>\u5904\u7406\u540e：<\/span>${<\/span>num}<\/span><\/span>`<\/span><\/span>)<\/span>;<\/span> \/\/ \u7ed3\u679c"\u5904\u7406\u540e：10"<\/span><\/p>\n

\u5c0f\u6280\u5de7：\u51fd\u6570\u7c7b\u578b\u522b\u540d\u53ef\u4ee5\u7ed3\u5408\u590d\u5408\u7c7b\u578b\u3001\u6cdb\u578b（\u540e\u7eed\u7ae0\u8282）\u4f7f\u7528，\u6bd4\u5982\u5b9a\u4e49\u201c\u63a5\u6536\u7528\u6237\u5bf9\u8c61，\u8fd4\u56de\u5e03\u5c14\u503c\u201d\u7684\u522b\u540d，\u9002\u914d\u590d\u6742\u4e1a\u52a1\u573a\u666f\u3002<\/p>\n

\u516d\u3001\u5b9e\u8df5：\u56de\u8c03\u51fd\u6570\u7684\u7c7b\u578b\u7ea6\u675f（\u9ad8\u9891\u573a\u666f）<\/h3>\n

\u56de\u8c03\u51fd\u6570\u662f\u524d\u7aef\u5f00\u53d1\u7684\u9ad8\u9891\u573a\u666f（\u5f02\u6b65\u8bf7\u6c42\u3001\u4e8b\u4ef6\u76d1\u542c\u3001\u6570\u7ec4\u65b9\u6cd5\u7b49），\u7528TS\u7ea6\u675f\u56de\u8c03\u7c7b\u578b，\u80fd\u907f\u514d\u201c\u56de\u8c03\u53c2\u6570\u4e71\u4f20\u3001\u8fd4\u56de\u503c\u4e0d\u7b26\u5408\u9884\u671f\u201d\u7684\u95ee\u9898\u3002\u54b1\u4eec\u7ed3\u5408\u4e24\u4e2a\u6838\u5fc3\u573a\u666f\u5b9e\u6218\u3002<\/p>\n

\u573a\u666f1：\u5f02\u6b65\u56de\u8c03（\u5982\u5b9a\u65f6\u5668\u3001\u8bf7\u6c42\u56de\u8c03）<\/h4>\n

\/\/ \u5b9a\u4e49\u5f02\u6b65\u51fd\u6570，\u63a5\u6536\u56de\u8c03\u53c2\u6570<\/span>
\ntype<\/span> AsyncCallback<\/span> =<\/span> (<\/span>result:<\/span> string<\/span>)<\/span> =><\/span> void<\/span>;<\/span> \/\/ \u56de\u8c03：\u63a5\u6536string，\u65e0\u8fd4\u56de\u503c<\/span>
\nfunction<\/span> fetchData<\/span>(<\/span>callback:<\/span> AsyncCallback)<\/span> {<\/span>
\n \/\/ \u6a21\u62df\u5f02\u6b65\u8bf7\u6c42<\/span>
\n setTimeout<\/span>(<\/span>(<\/span>)<\/span> =><\/span> {<\/span>
\n callback<\/span>(<\/span>"\u8bf7\u6c42\u6210\u529f，\u8fd4\u56de\u6570\u636e"<\/span>)<\/span>;<\/span> \/\/ \u56de\u8c03\u53c2\u6570\u5fc5\u987b\u662fstring，\u5426\u5219\u62a5\u9519<\/span>
\n }<\/span>,<\/span> 1000<\/span>)<\/span>;<\/span>
\n}<\/span><\/p>\n

\/\/ \u8c03\u7528：\u56de\u8c03\u51fd\u6570\u53c2\u6570\u81ea\u52a8\u5339\u914d\u7c7b\u578b<\/span>
\nfetchData<\/span>(<\/span>(<\/span>res)<\/span> =><\/span> {<\/span>
\n console<\/span>.<\/span>log<\/span>(<\/span>res)<\/span>;<\/span> \/\/ res\u88ab\u63a8\u5bfc\u4e3astring，\u6709\u4ee3\u7801\u63d0\u793a<\/span>
\n}<\/span>)<\/span>;<\/span><\/p>\n

\u573a\u666f2：\u4e8b\u4ef6\u56de\u8c03（\u5982DOM\u4e8b\u4ef6）<\/h4>\n

DOM\u4e8b\u4ef6\u56de\u8c03\u6709\u81ea\u5e26\u7684\u7c7b\u578b（\u5982MouseEvent\u3001KeyboardEvent），\u65e0\u9700\u624b\u52a8\u5b9a\u4e49，\u76f4\u63a5\u590d\u7528TS\u5185\u7f6e\u7c7b\u578b\u5373\u53ef\u3002<\/p>\n

\/\/ \u83b7\u53d6\u6309\u94ae\u5143\u7d20（\u7528\u975e\u7a7a\u65ad\u8a00!，\u6392\u9664null）<\/span>
\nconst<\/span> btn =<\/span> document.<\/span>getElementById<\/span>(<\/span>"btn"<\/span>)<\/span>!<\/span>;<\/span><\/p>\n

\/\/ \u70b9\u51fb\u4e8b\u4ef6\u56de\u8c03：\u53c2\u6570e\u7c7b\u578b\u4e3aMouseEvent<\/span>
\nbtn.<\/span>addEventListener<\/span>(<\/span>"click"<\/span>,<\/span> (<\/span>e:<\/span> MouseEvent)<\/span> =><\/span> {<\/span>
\n console<\/span>.<\/span>log<\/span>(<\/span>"\u70b9\u51fb\u4f4d\u7f6e："<\/span>,<\/span> e.<\/span>clientX,<\/span> e.<\/span>clientY)<\/span>;<\/span> \/\/ e\u6709\u5b8c\u6574\u7684\u4e8b\u4ef6\u5c5e\u6027\u63d0\u793a<\/span>
\n}<\/span>)<\/span>;<\/span><\/p>\n

\/\/ \u952e\u76d8\u4e8b\u4ef6\u56de\u8c03：\u53c2\u6570e\u7c7b\u578b\u4e3aKeyboardEvent<\/span>
\ndocument.<\/span>addEventListener<\/span>(<\/span>"keydown"<\/span>,<\/span> (<\/span>e:<\/span> KeyboardEvent)<\/span> =><\/span> {<\/span>
\n console<\/span>.<\/span>log<\/span>(<\/span>"\u6309\u4e0b\u6309\u952e："<\/span>,<\/span> e.<\/span>key)<\/span>;<\/span>
\n}<\/span>)<\/span>;<\/span><\/p>\n

\u907f\u5751\u70b9：DOM\u5143\u7d20\u83b7\u53d6\u53ef\u80fd\u8fd4\u56denull，\u7528!\u975e\u7a7a\u65ad\u8a00（\u786e\u8ba4\u5143\u7d20\u5b58\u5728），\u6216\u5148\u5224\u65ad\u5143\u7d20\u662f\u5426\u5b58\u5728，\u518d\u7ed1\u5b9a\u4e8b\u4ef6，\u907f\u514d\u7c7b\u578b\u9519\u8bef\u3002<\/p>\n

\u4e03\u3001\u672c\u7ae0\u5c0f\u7ed3：\u51fd\u6570\u7c7b\u578b\u7684\u6838\u5fc3\u662f\u201c\u7cbe\u51c6\u7ea6\u675f\u8f93\u5165\u8f93\u51fa\u201d<\/h3>\n

\u8fd9\u4e00\u7ae0\u54b1\u4eec\u5403\u900f\u4e86\u51fd\u6570\u7c7b\u578b\u7684\u5168\u573a\u666f\u7ea6\u675f，\u6838\u5fc3\u903b\u8f91\u53ef\u4ee5\u603b\u7ed3\u4e3a：\u51fd\u6570\u7c7b\u578b\u6807\u6ce8\u7684\u672c\u8d28\u662f\u201c\u9501\u5b9a\u8f93\u5165\u8f93\u51fa\u7684\u89c4\u5219\u201d\u2014\u2014\u53ef\u9009\u53c2\u6570\u3001\u9ed8\u8ba4\u53c2\u6570\u3001\u5269\u4f59\u53c2\u6570\u8d1f\u8d23\u201c\u7075\u6d3b\u9002\u914d\u8f93\u5165\u573a\u666f\u201d，\u51fd\u6570\u91cd\u8f7d\u8d1f\u8d23\u201c\u591a\u573a\u666f\u5dee\u5f02\u5316\u7ea6\u675f\u201d，\u7c7b\u578b\u522b\u540d\u8d1f\u8d23\u201c\u63d0\u5347\u7c7b\u578b\u590d\u7528\u6027\u201d\u3002<\/p>\n

\u65b0\u624b\u5bb9\u6613\u8e29\u7684\u5751：\u4e00\u662f\u53ef\u9009\u53c2\u6570\u653e\u9519\u4f4d\u7f6e；\u4e8c\u662f\u5ffd\u7565\u53ef\u9009\u53c2\u6570\u7684undefined\u5224\u65ad；\u4e09\u662f\u51fd\u6570\u91cd\u8f7d\u5b9e\u73b0\u4e0d\u517c\u5bb9\u6240\u6709\u7b7e\u540d；\u56db\u662f\u56de\u8c03\u51fd\u6570\u6ee5\u7528any\u3002\u8fd9\u4e9b\u90fd\u9700\u8981\u901a\u8fc7\u591a\u5199\u5b9e\u6218\u4ee3\u7801\u6765\u78e8\u5408，\u517b\u6210\u201c\u5148\u5b9a\u89c4\u5219，\u518d\u5199\u903b\u8f91\u201d\u7684\u4e60\u60ef\u3002<\/p>\n

\u4e0b\u4e00\u7ae0\u54b1\u4eec\u8981\u89e3\u9501TS\u7684\u201c\u7ed3\u6784\u5316\u7ea6\u675f\u795e\u5668\u201d\u2014\u2014\u63a5\u53e3（Interface），\u5b66\u4f1a\u7528\u63a5\u53e3\u7edf\u4e00\u590d\u6742\u5bf9\u8c61\u3001\u51fd\u6570\u7684\u7c7b\u578b\u89c4\u5219，\u8ba9\u4ee3\u7801\u66f4\u89c4\u8303\u3001\u66f4\u6613\u7ef4\u62a4\u3002\u54b1\u4eec\u4e0b\u4e00\u7ae0\u89c1！<\/p>\n","protected":false},"excerpt":{"rendered":"

TypeScript\u5b66\u4e60-\u7b2c4\u7ae0：\u51fd\u6570\u7c7b\u578b
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