{"id":167646,"date":"2024-05-08T16:07:15","date_gmt":"2024-05-08T08:07:15","guid":{"rendered":"https:\/\/docs.pingcode.com\/ask\/ask-ask\/167646.html"},"modified":"2024-05-08T16:07:21","modified_gmt":"2024-05-08T08:07:21","slug":"javascript%ef%bc%9a%e5%85%b3%e4%ba%8e%e7%a8%80%e7%96%8f%e6%95%b0%e7%bb%84%e7%9a%84%e9%97%ae%e9%a2%98","status":"publish","type":"post","link":"https:\/\/docs.pingcode.com\/ask\/167646.html","title":{"rendered":"JavaScript\uff1a\u5173\u4e8e\u7a00\u758f\u6570\u7ec4\u7684\u95ee\u9898"},"content":{"rendered":"<p style=\"text-align:center\"><img decoding=\"async\" src=\"https:\/\/cdn-kb.worktile.com\/kb\/wp-content\/uploads\/2024\/04\/27033706\/891552de-196e-4371-ab84-e6ba2c1ac1cf.webp\" alt=\"JavaScript\uff1a\u5173\u4e8e\u7a00\u758f\u6570\u7ec4\u7684\u95ee\u9898\" \/><\/p>\n<p><p>JavaScript\u4e2d\u7684\u7a00\u758f\u6570\u7ec4\u662f\u6307\u6570\u7ec4\u4e2d\u542b\u6709\u4e0d\u8fde\u7eed\u7d22\u5f15\u7684\u6570\u7ec4\u3002<strong>\u7a00\u758f\u6570\u7ec4\u7684\u7279\u70b9\u4e3b\u8981\u6709\u4e24\u4e2a\uff1a\u5305\u542b\u7a7a\u4f4d\u3001\u6027\u80fd\u8f83\u7a20\u5bc6\u6570\u7ec4\u5dee<\/strong>\u3002\u5728\u7a00\u758f\u6570\u7ec4\u4e2d\uff0c\u7a7a\u4f4d\u6307\u7684\u662f\u6570\u7ec4\u4e2d\u67d0\u4e9b\u7d22\u5f15\u4f4d\u6ca1\u6709\u88ab\u8d4b\u4e88\u503c\u3002\u4f8b\u5982\uff0c\u521b\u5efa\u4e00\u4e2a\u6570\u7ec4\uff0c\u4ec5\u5bf9\u7b2c0\u4e2a\u548c\u7b2c1000\u4e2a\u4f4d\u7f6e\u8d4b\u503c\uff0c\u4e2d\u95f4\u7684998\u4e2a\u4f4d\u7f6e\u90fd\u5c06\u662f\u7a7a\u4f4d\u3002\u7a00\u758f\u6570\u7ec4\u548c\u7a20\u5bc6\u6570\u7ec4\u7684\u6027\u80fd\u5dee\u5f02\u4e3b\u8981\u4f53\u73b0\u5728\u904d\u5386\u548c\u8bbf\u95ee\u901f\u5ea6\u4e0a\uff0c\u7a00\u758f\u6570\u7ec4\u56e0\u4e3a\u6709\u7a7a\u4f4d\u7684\u5b58\u5728\uff0c\u5176\u5728\u904d\u5386\u65f6\u9700\u505a\u66f4\u591a\u7684\u5224\u65ad\u5904\u7406\uff0c\u76f8\u6bd4\u4e4b\u4e0b\uff0c\u7a20\u5bc6\u6570\u7ec4\u56e0\u4e3a\u6bcf\u4e2a\u4f4d\u7f6e\u90fd\u6709\u503c\uff0c\u5904\u7406\u8d77\u6765\u66f4\u4e3a\u5feb\u6377\u3002<\/p>\n<\/p>\n<p><p>\u5bf9<strong>\u7a7a\u4f4d\u7684\u5904\u7406\u548c\u7406\u89e3<\/strong>\u9700\u5c55\u5f00\u8be6\u7ec6\u63cf\u8ff0\u3002\u5728JavaScript\u4e2d\uff0c\u6570\u7ec4\u7684\u7a7a\u4f4d\u5e76\u4e0d\u4f1a\u88ab\u771f\u5b9e\u5730\u5b58\u50a8\u3002\u4f8b\u5982\uff0c\u5f53\u4f60\u521b\u5efa\u4e86\u4e00\u4e2a\u957f\u5ea6\u4e3a100\u4f46\u53ea\u8d4b\u503c\u4e86\u4e24\u4e2a\u5143\u7d20\u7684\u7a00\u758f\u6570\u7ec4\u65f6\uff0c\u8fd9\u4e2a\u6570\u7ec4\u5e76\u4e0d\u4f1a\u5b9e\u9645\u5360\u7528100\u4e2a\u5143\u7d20\u7684\u5b58\u50a8\u7a7a\u95f4\u3002\u5728\u904d\u5386\u8fd9\u6837\u7684\u6570\u7ec4\u65f6\uff0c\u7a7a\u4f4d\u5904\u7684\u503c\u4f1a\u88ab\u5904\u7406\u4e3a<code>undefined<\/code>\uff0c\u4f46\u8fd9\u5e76\u4e0d\u7b49\u4e8e\u7a7a\u4f4d\u76f4\u63a5\u88ab\u8d4b\u503c\u4e3a<code>undefined<\/code>\u3002JavaScript\u7684\u4e00\u4e9b\u6570\u7ec4\u65b9\u6cd5\u5bf9\u5f85\u7a7a\u4f4d\u7684\u5904\u7406\u5404\u4e0d\u76f8\u540c\uff0c\u6bd4\u5982<code>map()<\/code>\u4f1a\u8df3\u8fc7\u7a7a\u4f4d\uff0c\u800c<code>forEach()<\/code>\u4f1a\u5ffd\u7565\u7a7a\u4f4d\u3002\u56e0\u6b64\uff0c\u6b63\u786e\u5904\u7406\u548c\u7406\u89e3\u7a00\u758f\u6570\u7ec4\u4e2d\u7684\u7a7a\u4f4d\u5bf9\u4e8e\u9ad8\u6548\u7f16\u7801\u800c\u8a00\u6781\u4e3a\u91cd\u8981\u3002<\/p>\n<\/p>\n<p><h2>\u4e00\u3001\u7a00\u758f\u6570\u7ec4\u7684\u521b\u5efa<\/h2>\n<\/p>\n<p><h3>\u521b\u5efa\u65b9\u5f0f<\/h3>\n<\/p>\n<p><p>\u521b\u5efa\u7a00\u758f\u6570\u7ec4\u7684\u65b9\u6cd5\u591a\u79cd\u591a\u6837\uff0c\u6700\u76f4\u63a5\u7684\u65b9\u5f0f\u662f\u5728\u6570\u7ec4\u5b57\u9762\u91cf\u4e2d\u4f7f\u7528\u9017\u53f7\u9694\u5f00\u4e0d\u8d4b\u503c\u7684\u9879\uff0c\u4f8b\u5982<code>let sparseArray = [1,,3];<\/code>\uff0c\u8fd9\u6837\u521b\u5efa\u7684<code>sparseArray<\/code>\u4fbf\u662f\u4e00\u4e2a\u5178\u578b\u7684\u7a00\u758f\u6570\u7ec4\uff0c\u5176\u4e2d\u7684\u7b2c1\u4e2a\u4f4d\u7f6e\u662f\u4e00\u4e2a\u7a7a\u4f4d\u3002\u6b64\u5916\uff0c\u901a\u8fc7\u6307\u5b9a\u6570\u7ec4\u7684\u957f\u5ea6\u521b\u5efa\u6570\u7ec4\u540e\uff0c\u518d\u7ed9\u7279\u5b9a\u7684\u7d22\u5f15\u4f4d\u7f6e\u8d4b\u503c\u4e5f\u53ef\u4ee5\u521b\u5efa\u7a00\u758f\u6570\u7ec4\u3002<\/p>\n<\/p>\n<p><h3>\u6ce8\u610f\u4e8b\u9879<\/h3>\n<\/p>\n<p><p>\u521b\u5efa\u7a00\u758f\u6570\u7ec4\u65f6\u9700\u8981\u7279\u522b\u7559\u610f\u4ee3\u7801\u7684\u53ef\u8bfb\u6027\u548c\u540e\u7eed\u7ef4\u62a4\u7684\u4fbf\u5229\u6027\u3002\u7531\u4e8e\u7a00\u758f\u6570\u7ec4\u5728\u67d0\u4e9b\u573a\u666f\u4e0b\u53ef\u80fd\u5bfc\u81f4\u4ee3\u7801\u884c\u4e3a\u4e0d\u76f4\u89c2\uff0c\u5efa\u8bae\u5728\u5fc5\u987b\u4f7f\u7528\u65f6\u624d\u9009\u62e9\u7a00\u758f\u6570\u7ec4\uff0c\u5e76\u505a\u597d\u5145\u5206\u7684\u6ce8\u91ca\u8bf4\u660e\u3002<\/p>\n<\/p>\n<p><h2>\u4e8c\u3001\u7a00\u758f\u6570\u7ec4\u7684\u6027\u80fd\u5f71\u54cd<\/h2>\n<\/p>\n<p><h3>\u6027\u80fd\u5bf9\u6bd4<\/h3>\n<\/p>\n<p><p>\u4e0e\u7a20\u5bc6\u6570\u7ec4\u76f8\u6bd4\uff0c\u7a00\u758f\u6570\u7ec4\u5728\u6027\u80fd\u4e0a\u5b58\u5728\u5dee\u5f02\u3002<strong>\u56e0\u4e3a\u7a7a\u4f4d\u7684\u5b58\u5728\uff0cJavaScript\u5f15\u64ce\u5728\u5904\u7406\u7a00\u758f\u6570\u7ec4\u65f6\u9700\u8981\u8fdb\u884c\u989d\u5916\u7684\u5224\u65ad<\/strong>\uff0c\u8fd9\u4e00\u7279\u6027\u4f7f\u5f97\u7a00\u758f\u6570\u7ec4\u5728\u8bf8\u5982\u904d\u5386\u3001\u641c\u7d22\u7b49\u64cd\u4f5c\u4e0a\u53ef\u80fd\u6bd4\u7a20\u5bc6\u6570\u7ec4\u6162\u3002\u5bf9\u4e8e\u9ad8\u6027\u80fd\u8981\u6c42\u7684\u5e94\u7528\uff0c\u8003\u8651\u6570\u7ec4\u7684\u7a20\u5bc6\u6027\u662f\u5341\u5206\u5fc5\u8981\u7684\u3002<\/p>\n<\/p>\n<p><h3>\u4f18\u5316\u7b56\u7565<\/h3>\n<\/p>\n<p><p>\u4e3a\u4e86\u7f13\u89e3\u7a00\u758f\u6570\u7ec4\u5e26\u6765\u7684\u6027\u80fd\u5f71\u54cd\uff0c\u53ef\u4ee5\u8003\u8651\u4ee5\u4e0b\u4f18\u5316\u7b56\u7565\uff1a<\/p>\n<\/p>\n<ul>\n<li>\u53ef\u80fd\u7684\u8bdd\uff0c\u907f\u514d\u4f7f\u7528\u7a00\u758f\u6570\u7ec4\uff0c\u7279\u522b\u662f\u5728\u6027\u80fd\u654f\u611f\u7684\u90e8\u5206\u3002<\/li>\n<li>\u4f7f\u7528\u4e13\u95e8\u7684\u6570\u636e\u7ed3\u6784\u6765\u6a21\u62df\u7a00\u758f\u6570\u7ec4\uff0c\u5982\u54c8\u5e0c\u8868\u7b49\uff0c\u8fd9\u4e9b\u7ed3\u6784\u5728\u5904\u7406\u4e0d\u8fde\u7eed\u7d22\u5f15\u65f6\u53ef\u80fd\u66f4\u52a0\u9ad8\u6548\u3002<\/li>\n<\/ul>\n<p><h2>\u4e09\u3001\u7a00\u758f\u6570\u7ec4\u7684\u65b9\u6cd5\u5904\u7406\u5dee\u5f02<\/h2>\n<\/p>\n<p><h3>\u6570\u7ec4\u65b9\u6cd5\u7684\u5dee\u5f02\u5904\u7406<\/h3>\n<\/p>\n<p><p>JavaScript\u4e2d\u7684\u8bb8\u591a\u6570\u7ec4\u65b9\u6cd5\u5728\u5904\u7406\u7a00\u758f\u6570\u7ec4\u65f6\u884c\u4e3a\u5404\u5f02\u3002\u4f8b\u5982\uff0c<code>forEach()<\/code>\u4f1a\u5ffd\u7565\u7a7a\u4f4d\uff0c\u800c<code>map()<\/code>\u4f1a\u4fdd\u7559\u7a7a\u4f4d\u4f46\u8df3\u8fc7\u8c03\u7528\u56de\u8c03\u51fd\u6570\u3002\u8fd9\u79cd\u5dee\u5f02\u4f7f\u5f97\u5f00\u53d1\u8005\u5728\u4f7f\u7528\u6570\u7ec4\u65b9\u6cd5\u65f6\u5fc5\u987b\u5bf9\u8fd9\u4e9b\u65b9\u6cd5\u7684\u884c\u4e3a\u6709\u6df1\u5165\u7684\u4e86\u89e3\u548c\u6b63\u786e\u7684\u9884\u671f\u3002<\/p>\n<\/p>\n<p><h3>\u7a00\u758f\u6570\u7ec4\u7684\u6700\u4f73\u5b9e\u8df5<\/h3>\n<\/p>\n<ul>\n<li>\u5728\u4f7f\u7528\u65f6\u660e\u786e\u77e5\u9053\u6bcf\u4e2a\u6570\u7ec4\u65b9\u6cd5\u5bf9\u7a7a\u4f4d\u7684\u5904\u7406\u65b9\u5f0f\uff0c\u907f\u514d\u4e0d\u5fc5\u8981\u7684\u9519\u8bef\u3002<\/li>\n<li>\u7ed3\u5408\u5177\u4f53\u7684\u5e94\u7528\u573a\u666f\u9009\u62e9\u5408\u9002\u7684\u6570\u7ec4\u65b9\u6cd5\uff0c\u6bd4\u5982\u5728\u4e0d\u9700\u8981\u5904\u7406\u7a7a\u4f4d\u7684\u573a\u666f\u4e0b\uff0c\u4f7f\u7528\u53ef\u4ee5\u81ea\u52a8\u8df3\u8fc7\u7a7a\u4f4d\u7684\u65b9\u6cd5\u3002<\/li>\n<\/ul>\n<p><h2>\u56db\u3001\u7a00\u758f\u6570\u7ec4\u7684\u5e94\u7528\u573a\u666f<\/h2>\n<\/p>\n<p><h3>\u4ec0\u4e48\u65f6\u5019\u4f7f\u7528<\/h3>\n<\/p>\n<p><p>\u7a00\u758f\u6570\u7ec4\u7684\u4f7f\u7528\u573a\u666f\u76f8\u5bf9\u8f83\u5c11\uff0c\u4f46\u5728\u67d0\u4e9b\u7279\u5b9a\u60c5\u51b5\u4e0b\u5b83\u4eec\u53ef\u4ee5\u63d0\u4f9b\u65b9\u4fbf\u3002\u4f8b\u5982\uff0c\u5728\u5904\u7406\u5927\u91cf\u4f46\u5206\u5e03\u4e0d\u5747\u7684\u6570\u636e\u65f6\uff0c\u4f7f\u7528\u7a00\u758f\u6570\u7ec4\u53ef\u4ee5\u5728\u4e0d\u5360\u7528\u8fc7\u591a\u5185\u5b58\u7684\u60c5\u51b5\u4e0b\uff0c\u6709\u6548\u5730\u8868\u793a\u8fd9\u4e9b\u6570\u636e\u3002<\/p>\n<\/p>\n<p><h3>\u4f7f\u7528\u65f6\u7684\u8003\u91cf<\/h3>\n<\/p>\n<p><p>\u4f7f\u7528\u7a00\u758f\u6570\u7ec4\u65f6\u9700\u8981\u8003\u8651\u7684\u4e3b\u8981\u6709\u4e24\u65b9\u9762\uff1a\u4e00\u662f\u5b83\u4eec\u5e26\u6765\u7684\u6f5c\u5728\u6027\u80fd\u95ee\u9898\uff0c\u4e8c\u662f\u4ee3\u7801\u7684\u53ef\u8bfb\u6027\u548c\u7ef4\u62a4\u6027\u3002\u5728\u51b3\u5b9a\u4f7f\u7528\u7a00\u758f\u6570\u7ec4\u524d\uff0c\u5e94\u5f53\u6743\u8861\u8fd9\u4e9b\u56e0\u7d20\uff0c\u786e\u4fdd\u5728\u7279\u5b9a\u7684\u5e94\u7528\u573a\u666f\u4e0b\u5b83\u4eec\u786e\u5b9e\u662f\u6700\u4f73\u9009\u62e9\u3002<\/p>\n<\/p>\n<p><p>\u7a00\u758f\u6570\u7ec4\u63d0\u4f9b\u4e86JavaScript\u4e2d\u5904\u7406\u975e\u8fde\u7eed\u6570\u636e\u7684\u4e00\u79cd\u65b9\u5f0f\uff0c\u4f46\u5b83\u4eec\u7684\u4f7f\u7528\u9700\u8981\u8c28\u614e\u548c\u6df1\u601d\u719f\u8651\u3002\u4e86\u89e3\u548c\u638c\u63e1\u7a00\u758f\u6570\u7ec4\u7684\u7279\u6027\u3001\u6027\u80fd\u5f71\u54cd\u4ee5\u53ca\u6b63\u786e\u7684\u4f7f\u7528\u573a\u666f\u548c\u65b9\u6cd5\uff0c\u662f\u6bcf\u4e2aJavaScript\u5f00\u53d1\u8005\u5728\u7f16\u7a0b\u5b9e\u8df5\u4e2d\u9700\u8981\u6ce8\u610f\u7684\u91cd\u70b9\u3002<\/p>\n<\/p>\n<h2><strong>\u76f8\u5173\u95ee\u7b54FAQs\uff1a<\/strong><\/h2>\n<p><strong>1. \u7a00\u758f\u6570\u7ec4\u662f\u4ec0\u4e48\uff1f<\/strong><br \/>\n\u7a00\u758f\u6570\u7ec4\u662f\u4e00\u4e2a\u6570\u7ec4\uff0c\u5176\u4e2d\u5305\u542b\u6709\u7a7a\u6d1e\u7684\u8fde\u7eed\u7d22\u5f15\u4f4d\u7f6e\u3002\u6362\u53e5\u8bdd\u8bf4\uff0c\u7a00\u758f\u6570\u7ec4\u4e2d\u5e76\u4e0d\u662f\u6bcf\u4e2a\u7d22\u5f15\u4f4d\u7f6e\u90fd\u6709\u4e00\u4e2a\u503c\u3002<\/p>\n<p><strong>2. \u5982\u4f55\u521b\u5efa\u7a00\u758f\u6570\u7ec4\uff1f<\/strong><br \/>\n\u8981\u521b\u5efa\u7a00\u758f\u6570\u7ec4\uff0c\u53ea\u9700\u5728\u6570\u7ec4\u5b9a\u4e49\u65f6\u7559\u4e0b\u4e00\u4e9b\u7d22\u5f15\u4f4d\u7f6e\u4e3a\u7a7a\u5373\u53ef\u3002\u4f8b\u5982\uff0c\u53ef\u4ee5\u4f7f\u7528\u5b57\u9762\u91cf\u65b9\u5f0f\u521b\u5efa\u7a00\u758f\u6570\u7ec4\uff1a<code>let sparseArr = [1, , , 4];<\/code><\/p>\n<p><strong>3. \u7a00\u758f\u6570\u7ec4\u4e0e\u5bc6\u96c6\u6570\u7ec4\u6709\u4ec0\u4e48\u533a\u522b\uff1f<\/strong><br 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