{"id":165978,"date":"2024-05-08T15:27:30","date_gmt":"2024-05-08T07:27:30","guid":{"rendered":"https:\/\/docs.pingcode.com\/ask\/ask-ask\/165978.html"},"modified":"2024-05-08T15:27:38","modified_gmt":"2024-05-08T07:27:38","slug":"javascript%e4%b8%ad%e7%9a%84%e6%9c%80%e5%a4%a7%e5%80%bc","status":"publish","type":"post","link":"https:\/\/docs.pingcode.com\/ask\/165978.html","title":{"rendered":"JavaScript\u4e2d\u7684\u6700\u5927\u503c"},"content":{"rendered":"<p style=\"text-align:center\"><img decoding=\"async\" src=\"https:\/\/cdn-kb.worktile.com\/kb\/wp-content\/uploads\/2024\/04\/26232951\/ba69adfe-bf91-4811-bc9c-ed9ab3fe3119.webp\" alt=\"JavaScript\u4e2d\u7684\u6700\u5927\u503c\" \/><\/p>\n<p><p>JavaScript\u4e2d\u80fd\u591f\u8868\u793a\u7684\u6700\u5927\u6570\u503c\u662f <strong>Number.MAX_VALUE<\/strong>\uff0c\u5b83\u5927\u7ea6\u7b49\u4e8e <strong>1.7976931348623157e+308<\/strong>\u3002\u8d85\u51fa\u8fd9\u4e2a\u8303\u56f4\u7684\u6570\u503c\u4f1a\u88ab\u89c6\u4e3a\u65e0\u7a77\u5927\uff08Infinity\uff09\u3002\u5728\u5b9e\u9645\u5f00\u53d1\u4e2d\uff0c\u4e86\u89e3\u8fd9\u4e00\u9650\u5236\u5341\u5206\u91cd\u8981\uff0c\u56e0\u4e3a\u5b83\u53ef\u80fd\u4f1a\u5f71\u54cd\u6570\u503c\u5904\u7406\u548c\u6570\u5b66\u8ba1\u7b97\u7684\u7cbe\u786e\u6027\u3002\u4f8b\u5982\uff0c\u5f53\u5904\u7406\u6781\u5927\u7684\u6570\u503c\u65f6\uff0c\u5f00\u53d1\u8005\u5e94\u5f53\u5c0f\u5fc3\u5904\u7406\u53ef\u80fd\u51fa\u73b0\u7684\u6ea2\u51fa\u95ee\u9898\uff0c\u5e76\u8003\u8651\u4f7f\u7528\u5982 BigInt \u8fd9\u6837\u7684\u7279\u6b8a\u6570\u636e\u7c7b\u578b\u6765\u5904\u7406\u8d85\u8fc7 <strong>Number.MAX_VALUE<\/strong> \u7684\u6570\u503c\u3002<\/p>\n<\/p>\n<p><p>\u4e00\u3001NUMBER.MAX_VALUE \u8be6\u89e3<\/p>\n<p>JavaScript \u4e2d\u7684 Number \u7c7b\u578b\u6309\u7167 IEEE 754 \u6807\u51c6\u5b9e\u73b0\uff0c\u8fd9\u610f\u5473\u7740\u5b83\u80fd\u591f\u8868\u793a\u7684\u6700\u5927\u6b63\u6570\u5c31\u662f <strong>Number.MAX_VALUE<\/strong>\u3002\u8fd9\u4e2a\u6570\u503c\u5728 JavaScript \u7684\u6240\u6709\u73b0\u4ee3\u6d4f\u89c8\u5668\u548c\u73af\u5883\u4e2d\u5747\u6709\u5b9a\u4e49\uff0c\u4f7f\u5176\u6210\u4e3a\u6807\u51c6\u5316\u7684\u90e8\u5206\u3002<\/p>\n<\/p>\n<p><p>\u4e8c\u3001\u8d85\u51fa\u6700\u5927\u503c\u7684\u540e\u679c<\/p>\n<p>\u786c\u6027\u5b9a\u4e49\u4e86\u6700\u5927\u6570\u503c\u4e4b\u540e\uff0c\u8d85\u51fa\u8fd9\u4e2a\u6570\u503c\u4f1a\u4ea7\u751f\u4ec0\u4e48\u6548\u679c\u5462\uff1f\u7b80\u5355\u6765\u8bf4\uff0c<strong>\u4efb\u4f55\u8d85\u51fa Number.MAX_VALUE \u7684\u6570\u503c\u90fd\u4f1a\u88ab\u8f6c\u6362\u4e3a JavaScript \u7684Infinity<\/strong>\u3002\u8fd9\u610f\u5473\u7740\uff0c\u8fd9\u4e9b\u6570\u503c\u5728\u6570\u5b66\u8fd0\u7b97\u4e2d\u65e0\u6cd5\u6b63\u5e38\u4f7f\u7528\uff0c\u5e76\u4e14\u6709\u53ef\u80fd\u5bfc\u81f4\u67d0\u4e9b\u6570\u503c\u6bd4\u8f83\u8fd0\u7b97\u5931\u6548\u3002<\/p>\n<\/p>\n<p><p>\u4e09\u3001BigInt\uff1a\u4e00\u4e2a\u89e3\u51b3\u65b9\u6848<\/p>\n<p>\u5bf9\u4e8e\u9700\u8981\u5904\u7406\u6bd4 Number.MAX_VALUE \u66f4\u5927\u6570\u503c\u7684\u573a\u5408\uff0cJavaScript \u5728\u6700\u65b0\u7684\u89c4\u8303\u4e2d\u5f15\u5165\u4e86 BigInt \u7c7b\u578b\u3002<strong>BigInt \u7c7b\u578b\u5141\u8bb8\u7528\u6237\u8868\u793a\u4efb\u610f\u7cbe\u5ea6\u7684\u6574\u6570<\/strong>\uff0c\u7406\u8bba\u4e0a\u53ef\u4ee5\u5904\u7406\u65e0\u9650\u5927\u7684\u6570\u503c\u3002\u4f7f\u7528 BigInt\uff0c\u5f00\u53d1\u8005\u53ef\u4ee5\u6267\u884c\u5927\u6570\u7684\u7b97\u672f\u8fd0\u7b97\u800c\u4e0d\u4f1a\u4e22\u5931\u7cbe\u5ea6\u3002<\/p>\n<\/p>\n<p><p>\u56db\u3001\u4f7f\u7528\u573a\u666f\u4e0e\u6ce8\u610f\u4e8b\u9879<\/p>\n<p>\u867d\u7136 Number.MAX_VALUE \u5b9a\u4e49\u4e86 JavaScript \u6570\u503c\u7684\u7406\u8bba\u4e0a\u9650\uff0c\u4f46\u5728\u4e0d\u5c11\u573a\u5408\u4e0b\u7684\u5b9e\u9645\u5e94\u7528\u4f1a\u8f83\u5c11\u9047\u89c1\u8d85\u51fa\u8fd9\u4e2a\u8303\u56f4\u7684\u60c5\u51b5\u3002\u4e0d\u8fc7\uff0c\u5728\u91d1\u878d\u79d1\u6280\u3001\u79d1\u5b66\u8ba1\u7b97\u7b49\u5bf9\u6570\u503c\u7cbe\u786e\u5ea6\u8981\u6c42\u6781\u9ad8\u7684\u9886\u57df\uff0c\u5904\u7406\u5927\u6570\u5b57\u65f6\u8fd8\u9700\u8c28\u614e\uff0c\u907f\u514d\u53ef\u80fd\u5f15\u8d77\u7684\u7cbe\u5ea6\u95ee\u9898\u548c\u6ea2\u51fa\u9519\u8bef\u3002<\/p>\n<\/p>\n<p><p>\u4e94\u3001\u517c\u5bb9\u6027\u548c\u8de8\u73af\u5883\u95ee\u9898<\/p>\n<p>\u5c3d\u7ba1 Number.MAX_VALUE \u4f5c\u4e3a\u57fa\u672c\u7684 JavaScript \u7279\u5f81\u5df2\u7ecf\u5f97\u5230\u4e86\u5e7f\u6cdb\u652f\u6301\uff0c\u4f46\u5904\u7406\u8d85\u5927\u6570\u503c\u65f6\u7684\u517c\u5bb9\u6027\u548c\u8de8\u73af\u5883\u95ee\u9898\u4ecd\u7136\u503c\u5f97\u5173\u6ce8\u3002\u7279\u522b\u662f\u5728\u4e0d\u540c\u7684 JavaScript \u73af\u5883\uff08\u5982\u4e0d\u540c\u7684\u6d4f\u89c8\u5668\u548c Node.js\uff09\u4e2d\uff0c\u5bf9\u4e8e\u5927\u6570\u503c\u7684\u5904\u7406\u53ef\u80fd\u4f1a\u6709\u7ec6\u5fae\u7684\u5dee\u5f02\u3002<\/p>\n<\/p>\n<p><p>\u516d\u3001\u7ed3\u5408\u73b0\u5b9e\u95ee\u9898\u7684\u6700\u4f73\u5b9e\u8df5<\/p>\n<p>\u5728\u65e5\u5e38\u5f00\u53d1\u4e2d\uff0c\u5408\u7406\u5229\u7528 Number.MAX_VALUE \u9700\u8981\u7ed3\u5408\u5b9e\u9645\u95ee\u9898\u3002\u5f00\u53d1\u8005\u5728\u8bbe\u8ba1\u7a0b\u5e8f\u65f6\u8981\u786e\u4fdd\u5145\u5206\u8003\u8651\u6781\u7aef\u60c5\u51b5\uff0c\u5e76\u5728\u6587\u6863\u4e2d\u660e\u786e\u6307\u51fa\u6570\u503c\u5904\u7406\u7684\u8303\u56f4\u9650\u5236\u3002\u8fdb\u884c\u5e38\u89c4\u7684\u9519\u8bef\u5904\u7406\u548c\u9a8c\u8bc1\u4e5f\u662f\u786e\u4fdd\u7a0b\u5e8f\u7a33\u5b9a\u6027\u7684\u5173\u952e\u3002<\/p>\n<\/p>\n<h2><strong>\u76f8\u5173\u95ee\u7b54FAQs\uff1a<\/strong><\/h2>\n<p><strong>1. JavaScript\u4e2d\u5982\u4f55\u627e\u51fa\u6570\u7ec4\u4e2d\u7684\u6700\u5927\u503c\uff1f<\/strong><br \/>\n\u5728JavaScript\u4e2d\uff0c\u53ef\u4ee5\u901a\u8fc7\u4f7f\u7528Math\u5bf9\u8c61\u7684max()\u65b9\u6cd5\u6765\u627e\u51fa\u6570\u7ec4\u4e2d\u7684\u6700\u5927\u503c\u3002\u8be5\u65b9\u6cd5\u63a5\u53d7\u4e00\u4e2a\u6570\u7ec4\u4f5c\u4e3a\u53c2\u6570\uff0c\u5e76\u8fd4\u56de\u8be5\u6570\u7ec4\u4e2d\u7684\u6700\u5927\u503c\u3002\u4f8b\u5982\uff0c\u8003\u8651\u4ee5\u4e0b\u4ee3\u7801\u7247\u6bb5\uff1a<\/p>\n<pre><code>const numbers = [1, 5, 9, 3, 7];\nconst maxNumber = Math.max(...numbers);\nconsole.log(maxNumber); \/\/ \u8f93\u51fa\uff1a9\n<\/code><\/pre>\n<p><strong>2. JavaScript\u4e2d\u5982\u4f55\u627e\u51fa\u5bf9\u8c61\u6570\u7ec4\u4e2d\u7684\u6700\u5927\u503c\uff1f<\/strong><br \/>\n\u5982\u679c\u8981\u627e\u51fa\u5bf9\u8c61\u6570\u7ec4\u4e2d\u67d0\u4e2a\u5c5e\u6027\u7684\u6700\u5927\u503c\uff0c\u53ef\u4ee5\u4f7f\u7528Array.reduce()\u65b9\u6cd5\u6765\u8fdb\u884c\u6bd4\u8f83\u3002reduce()\u65b9\u6cd5\u63a5\u53d7\u4e00\u4e2a\u56de\u8c03\u51fd\u6570\u4f5c\u4e3a\u53c2\u6570\uff0c\u8be5\u51fd\u6570\u53ef\u4ee5\u7528\u6765\u6bd4\u8f83\u6570\u7ec4\u4e2d\u7684\u5143\u7d20\u5e76\u8fd4\u56de\u6700\u5927\u503c\u3002\u4f8b\u5982\uff0c\u8003\u8651\u4ee5\u4e0b\u4ee3\u7801\u7247\u6bb5\uff1a<\/p>\n<pre><code>const students = [\n  { name: &#039;John&#039;, score: 80 },\n  { name: &#039;Jane&#039;, score: 95 },\n  { name: &#039;Bob&#039;, score: 75 }\n];\n\nconst maxScore = students.reduce((max, student) =&gt; {\n  return (student.score &gt; max) ? student.score : max;\n}, 0);\n\nconsole.log(maxScore); \/\/ \u8f93\u51fa\uff1a95\n<\/code><\/pre>\n<p><strong>3. JavaScript\u4e2d\u5982\u4f55\u627e\u51fa\u5b57\u7b26\u4e32\u6570\u7ec4\u4e2d\u6700\u957f\u7684\u5b57\u7b26\u4e32\uff1f<\/strong><br \/>\n\u5982\u679c\u8981\u627e\u51fa\u5b57\u7b26\u4e32\u6570\u7ec4\u4e2d\u6700\u957f\u7684\u5b57\u7b26\u4e32\uff0c\u53ef\u4ee5\u4f7f\u7528Array.reduce()\u65b9\u6cd5\u7ed3\u5408\u5b57\u7b26\u4e32\u7684length\u5c5e\u6027\u6765\u8fdb\u884c\u6bd4\u8f83\u3002\u5982\u4e0b\u6240\u793a\uff1a<\/p>\n<pre><code>const strings = [&#039;hello&#039;, &#039;world&#039;, &#039;JavaScript&#039;, &#039;web&#039;, &#039;development&#039;];\n\nconst longestString = strings.reduce((longest, current) =&gt; {\n  return (current.length &gt; longest.length) ? current : longest;\n}, &#039;&#039;);\n\nconsole.log(longestString); \/\/ \u8f93\u51fa\uff1a&#039;development&#039;\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"JavaScript\u4e2d\u80fd\u591f\u8868\u793a\u7684\u6700\u5927\u6570\u503c\u662f Number.MAX_VALUE\uff0c\u5b83\u5927\u7ea6\u7b49\u4e8e 1.79769313 [&hellip;]","protected":false},"author":3,"featured_media":165995,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[37],"tags":[],"acf":[],"_links":{"self":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/165978"}],"collection":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/comments?post=165978"}],"version-history":[{"count":0,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/165978\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media\/165995"}],"wp:attachment":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media?parent=165978"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/categories?post=165978"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/tags?post=165978"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}