{"id":1166,"date":"2022-05-15T15:14:10","date_gmt":"2022-05-15T07:14:10","guid":{"rendered":"http:\/\/zhuxinyong.com\/?p=1166"},"modified":"2022-05-15T16:33:39","modified_gmt":"2022-05-15T08:33:39","slug":"ni-wei-he-yao-bi-mian-shi-yong-indexjs","status":"publish","type":"post","link":"https:\/\/zhuxinyong.com\/?p=1166","title":{"rendered":"\u4f60\u4e3a\u4f55\u8981\u907f\u514d\u4f7f\u7528 index.js ?"},"content":{"rendered":"

\"2022-05-15+15_19_50\"<\/p>\n

\u5728\u5f88\u591a JavaScript \u9879\u76ee\u4e2d\uff0c\u4e0d\u7ba1\u662f\u524d\u7aef React \u9879\u76ee\uff0c\u8fd8\u662f\u540e\u7aef node.js \u9879\u76ee\u4f60\u53ef\u4ee5\u901a\u8fc7\u4e00\u4e2a index.js \u6587\u4ef6\u6765\u805a\u5408\u6240\u6709\u7684\u5bfc\u5165\u3002\u5728\u4e00\u4e2a\u6587\u4ef6\u4e2d\u5bfc\u51fa\u6240\u6709\u76f8\u5173\u7684 exports \u4f1a\u65b9\u4fbf\u8bb8\u591a\uff0c\u63a5\u7740\u5176\u5b83\u6587\u4ef6\u53ef\u4ee5\u4ece\u8fd9\u4e2a\u6587\u4ef6\u4e2d\u5bfc\u5165\u5185\u5bb9\u3002\u5b83\u770b\u4e0a\u53bb\u7b80\u6d01\uff0c\u4f46\u53ef\u80fd\u4f1a\u5f88\u5feb\u5931\u63a7\u3002<\/p>\n

TLDR:<\/strong><\/p>\n

\u4e3a\u4f55\u4f60\u5e94\u8be5\u907f\u514d\u805a\u5408\u6240\u6709\u7684\u5bfc\u5165\u5230\u4e00\u4e2a\u6587\u4ef6 index.js \u4e2d\uff1f<\/strong><\/p>\n

    \n
  1. \u5faa\u73af\u5f15\u7528\uff1b<\/li>\n
  2. \u4f7f\u7528\u52a8\u6001\u5bfc\u5165\u65f6\u7684\u610f\u5916\u5bfc\u5165\uff1b<\/li>\n
  3. nodejs \u7684\u4f5c\u8005\u4e5f\u8bf4\u8981\u907f\u514d\u4f7f\u7528\uff1b<\/li>\n<\/ol>\n

    \u4ec0\u4e48\u65f6\u5019\u53ef\u4ee5 index.js ?<\/strong><\/p>\n

    \u5f53\u4f60\u521b\u5efa npm \u5305\u65f6\uff0c\u5efa\u8bae\u4f7f\u7528 index.js \u3002<\/p>\n

    <\/span><\/a>\u5178\u578b\u7684 index.js \u957f\u4ec0\u4e48\u6837\u5b50\uff1f<\/h3>\n

    \u5178\u578b\u7684 index.js \u6587\u4ef6\u50cf\u4e0b\u9762\u8fd9\u6837\uff0c\u53ef\u4ee5\u805a\u5408\u6240\u6709\u7684\u5bfc\u51fa\u5728\u4e00\u4e2a\u6587\u4ef6\u4e2d\u3002<\/p>\n

    \"\"<\/p>\n

    <\/span><\/a>1. \u5faa\u73af\u5f15\u7528<\/h3>\n

    \u867d\u7136\u65f6\u95f4\u7684\u63a8\u79fb index.js \u6587\u4ef6\u53d8\u5f97\u8d8a\u6765\u8d8a\u5927\uff0c\u6b64\u65f6\u4e00\u4f4d\u5f00\u53d1\u8005\u5229\u7528\u81ea\u52a8\u5f15\u5165\u529f\u80fd\uff0c\u5728\u4e00\u4e2a\u76f8\u90bb\u6587\u4ef6\u4e2d\u5f15\u5165\u4e86 index.js \u4e2d\u7684\u5185\u5bb9\u3002<\/p>\n

    \"\"<\/p>\n

    \u73b0\u5728\uff0c\u8be5\u5f00\u53d1\u8005\u53c8\u901a\u8fc7 index.js \u6587\u4ef6\u5bfc\u51fa\u4e86\u4e00\u4e9b\u5185\u5bb9\uff0c\u5c31\u50cf\u5176\u4ed6\u4eba\u505a\u7684\u4e00\u6837\u3002<\/p>\n

    \"\"<\/p>\n

    \u73b0\u5728\u95ee\u9898\u662f\u4ec0\u4e48\uff1f\u4ed6\u5236\u9020\u4e86\u4e00\u4e2a\u5faa\u73af\u5f15\u7528\u3002<\/p>\n

    \u4ec0\u4e48\uff1f"composition.js" \u4ece "index.js" \u4e2d\u5bfc\u5165 Items\uff0c"index.js" \u5bfc\u5165\u4e86 "composition.js" \u4e2d\u7684 "CompostionsOfItems" \u5e76\u5bfc\u51fa\u3002<\/p>\n

    \n

    composition.js \u2192 index.js \u2192 composition.js<\/p>\n<\/blockquote>\n

    \u73b0\u5728\uff0c\u4e00\u4e2a\uff08\u4f8b\u5982\uff0citems.js\uff09\u4ece index.js \u6587\u4ef6\u4e2d\u5bfc\u5165\u4e00\u4e9b\u53d8\u91cf\u7684\u6587\u4ef6\u5c06\u4f1a\u629b\u51fa\u9519\u8bef\uff1acannot read property "Item1" of undefined<\/code>\u3002<\/p>\n

    \u4e00\u4e9b\u7f16\u8bd1\u5de5\u5177\u53ef\u4ee5\u5e94\u4ed8\u8fd9\u79cd\u5faa\u73af\u5bfc\u5165\uff08\u4f8b\u5982\uff1a\u5e26\u6709 babel \u7684 webpack\uff09\uff0c\u4f46\u662f\u5176\u4ed6\u4f8b\u5b50\uff08jest + ts-jest\u3001jest + bable\uff09\u7684\u7f16\u8bd1\u65e0\u6cd5\u5904\u7406\u8fd9\u79cd\u95ee\u9898\uff0c\u5c06\u4f1a\u629b\u51fa\u4e0d\u6e05\u6670\u7684\u9519\u8bef\u4fe1\u606f\u3002\u8fd9\u5f88\u96be\u8c03\u8bd5\u4f46\u662f\u5f53\u4f60\u77e5\u9053\u907f\u514d\u4f7f\u7528 index.js \u65f6\uff0c\u6b64\u79cd\u95ee\u9898\u5c06\u4f1a\u5f88\u5c11\u3002<\/p>\n

    \u95ee\u9898<\/strong>\uff1a\u90a3\u6211\u4eec\u8be5\u5982\u4f55\u505a \uff1f<\/p>\n

    \u56de\u7b54\uff1a<\/strong> \u907f\u514d\u4f7f\u7528 index.js \u540c\u65f6\u53ea\u4ece\u6587\u4ef6\u4e2d\u5f15\u5165\u4f60\u9700\u8981\u7684\u5185\u5bb9\u3002\u5728\u6211\u4eec\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\uff0c\u4ece items.js \u4e2d\u5f15\u5165 Item1 \u548c Item2 \u5c31\u4e0d\u4f1a\u4ea7\u751f\u95ee\u9898\u3002<\/p>\n

    \u907f\u514d\u4f7f\u7528 index.js \u5e76\u4e0d\u80fd\u4fdd\u8bc1\u4e0d\u4f1a\u4ea7\u751f\u5faa\u73af\u5f15\u7528\uff0c\u4f60\u5fc5\u987b\u628a\u5bfc\u5165\u8bed\u53e5\u7ec4\u7ec7\u6210\u4e00\u4e2a\u6811\u72b6\u7ed3\u6784\u3002<\/p>\n

    \"\"<\/p>\n

    \u907f\u514d\u5faa\u73af\u5f15\u7528\u7684\u53e6\u4e00\u79cd\u65b9\u6cd5\u662f\u4f7f\u7528 eslint-plugin-import \u4e2d\u7684 Eslint no-cycle<\/code> \u89c4\u5219\uff1a<\/p>\n

    \"\"<\/p>\n

    <\/span><\/a>2. \u4f7f\u7528\u52a8\u6001\u5bfc\u5165\u65f6\u7684\u610f\u5916\u5bfc\u5165<\/h3>\n

    \u5f53\u5728\u5199\u524d\u7aef\u9879\u76ee\u65f6\uff0c\u901a\u5e38\u662f\u8981\u8003\u8651\u4f7f\u7528\u52a8\u6001\u5bfc\u5165\u6765\u5206\u5272\u4ee3\u7801\u3002\u4f8b\u5982\uff1a\u5728 React \u4e2d\u4f60\u53ef\u4ee5\u4f7f\u7528 React.lazy()<\/code> \u4f7f\u4ee3\u7801\u5206\u5272\u4e3a\u591a\u5757\u3002\u4f7f\u7528\u54ea\u4e2a\u6846\u67b6\u5e76\u4e0d\u91cd\u8981\uff0c\u4f46\u6211\u4eec\u4ee5\u5199 react app \u4e3a\u4f8b\uff0c\u4f60\u628a\u6240\u6709\u7684 routes \u6574\u6d01\u7684\u805a\u5408\u4e0e routes.js \u6587\u4ef6\u4e2d\uff1a<\/p>\n

    \/\/ routes.js\nexport Route1 from 'route1'\nexport Route2 from 'route2'\nexport Route3 from 'route3'\nexport Route4 from 'route4'\n<\/code><\/pre>\n
    \u82e5\u4f60\u6253\u7b97\u5229\u7528\u61d2\u52a0\u8f7d\u6765\u4f7f\u4f60\u7684\u5e94\u7528\u66f4\u5feb\uff0c\u4f60\u53ef\u80fd\u4f1a\u5199\u51fa\u4e0b\u9762\u7684\u4ee3\u7801\uff1a<\/p>\n
    const LazyRoute1 = React.lazy(() => import('.\/routes').then(module => ({ default: module.Route1 }));\n<\/code><\/pre>\n
    \u7f6a\u9b41\u7978\u9996\u662f\u4ec0\u4e48\uff1f\u4f60\u5b9e\u9645\u4e0a\u662f\u4e00\u6b21\u6027\u8bf7\u6c42\u4e86\u6240\u6709\u7684\u8def\u7531\u800c\u4e0d\u662f\u53ea\u6309\u9700\u52a0\u8f7d\u4e86 Route1 \uff0c\u5bfc\u81f4\u4f7f\u7528\u4e86\u6bd4\u9884\u671f\u66f4\u591a\u7684\u5e26\u5bbd\u540c\u65f6\u4e5f\u4f7f\u61d2\u52a0\u8f7d\u548c\u4ee3\u7801\u5206\u5272\u529f\u80fd\u5931\u6548\u3002<\/p>\n
    <\/span><\/a>3. nodejs \u7684\u4f5c\u8005\u4e5f\u8bf4\u907f\u514d\u4f7f\u7528 index.js<\/h3>\n
    \u5728 JSConf EU \u7684\u4f1a\u8bae\u4e0a\uff0cnodejs \u7684\u4f5c\u8005 Ryan Dahl \u6f14\u793a\u4e86\u5173\u4e8e nodejs \u7684 10 \u4ef6\u9057\u61be\u7684\u4e8b\uff0c\u5176\u4e2d\u4e00\u4e2a\u5c31\u662f index.js \u6587\u4ef6\u3002\u90a3\u662f\u4e00\u4e2a\u5f88\u597d\u7684\u6f14\u8bb2\u6211\u5efa\u8bae\u4f60\u770b\u4e0b\uff1a<\/p>\n
    \u603b\u7ed3\uff1a10 Things I Regret About Node.js \u2014 Ryan Dahl<\/a><\/p>\n
    \u89c6\u9891\uff1a10 Things I Regret About Node.js – Ryan Dahl – JSConf EU<\/a><\/p>\n
    \"\"<\/p>\n
    <\/span><\/a>\u4ec0\u4e48\u65f6\u5019\u4f60\u5e94\u8be5\u4f7f\u7528 index.js ?<\/h3>\n
    \u5982\u679c\u4f60\u521b\u5efa\u4e86\u4e00\u4e2a\u5f00\u6e90\u7684\u5305\u540c\u65f6\u5e0c\u671b\u5bfc\u51fa\u516c\u5171\u6a21\u5757\uff0c\u901a\u5e38\u662f\u4f7f\u7528\u4e00\u4e2a\u6587\u4ef6\u6765\u66b4\u9732\u51fa\u6240\u6709\u9700\u8981\u5bfc\u51fa\u7684\u4e1c\u897f\u3002<\/p>\n
    \"\"<\/p>\n
    \u53e6\u5916\u6211\u4e2a\u4eba\u52a0\u4e00\u4e2a\u975e\u4f5c\u8005\u6240\u5199<\/strong>\uff0c\u5c31\u662f\u5f53\u641c\u6587\u4ef6\u6216\u6587\u4ef6\u7f16\u8f91\u5668\u91cc\u6253\u5f00\u4e86\u5f88\u591a index.js \u65f6\uff0c\u4f1a\u8ba9\u6211\u6293\u72c2\uff0c\u6839\u672c\u4e0d\u77e5\u9053\u6253\u5f00\u4e86\u4ec0\u4e48\u6587\u4ef6\uff1a<\/p>\n
    \"\"<\/p>\n
    \u6211\u7684\u4e2a\u4eba\u5efa\u8bae\u662f\uff1a\u4e1a\u52a1\u4ee3\u7801\u4e2d\u5c11\u7528 index.js \u6765\u7ec4\u7ec7\u4ee3\u7801<\/strong>\u3002<\/p>\n
    \u539f\u6587\u94fe\u63a5\uff1ahttps:\/\/medium.com\/@alonmiz1234\/why-you-should-avoid-index-js-3321a9902120<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"
    \u5728\u5f88\u591a JavaScript \u9879\u76ee\u4e2d\uff0c\u4e0d\u7ba1\u662f\u524d\u7aef React \u9879\u76ee\uff0c\u8fd8\u662f\u540e\u7aef node.js \u9879\u76ee\u4f60...<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[2,20,21,3],"tags":[11],"class_list":["post-1166","post","type-post","status-publish","format-standard","hentry","category-all","category-frontend","category-backend","category-tech","tag-11"],"_links":{"self":[{"href":"https:\/\/zhuxinyong.com\/index.php?rest_route=\/wp\/v2\/posts\/1166","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/zhuxinyong.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/zhuxinyong.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/zhuxinyong.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/zhuxinyong.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1166"}],"version-history":[{"count":1,"href":"https:\/\/zhuxinyong.com\/index.php?rest_route=\/wp\/v2\/posts\/1166\/revisions"}],"predecessor-version":[{"id":1167,"href":"https:\/\/zhuxinyong.com\/index.php?rest_route=\/wp\/v2\/posts\/1166\/revisions\/1167"}],"wp:attachment":[{"href":"https:\/\/zhuxinyong.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1166"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/zhuxinyong.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1166"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/zhuxinyong.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1166"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}