{"id":838,"date":"2018-05-05T10:45:42","date_gmt":"2018-05-05T02:45:42","guid":{"rendered":"http:\/\/zouyang1230.com\/blog\/?p=838"},"modified":"2020-10-28T22:46:47","modified_gmt":"2020-10-28T14:46:47","slug":"js%e8%b6%a3%e7%8e%a9%ef%bc%9a%e5%ae%9e%e7%8e%b0js%e6%95%b0%e5%ad%97%e9%98%b6%e4%b9%98%ef%bc%88%e6%ad%a3%e6%95%b0%e9%98%b6%e4%b9%98%ef%bc%89","status":"publish","type":"post","link":"http:\/\/www.imzouyang.com\/blog\/archives\/838.html","title":{"rendered":"js\u8da3\u73a9\uff1a\u5b9e\u73b0js\u6570\u5b57\u9636\u4e58\uff08\u6b63\u6570\u9636\u4e58\uff09"},"content":{"rendered":"<p>\u672c\u6587\u4e3e\u4f8b\u8ba8\u8bba\u5982\u4f55\u89e3\u51fa\u4e00\u4e2a\u6570\u5b57\u9636\u4e58\u3002\u8d1f\u6570\u9636\u4e58\u672c\u8eab\u6ca1\u6709\u591a\u5927\u610f\u4e49\uff0c\u672c\u6587\u793a\u4f8b\u4e3a\u6b63\u6570\u9636\u4e58\u3002<br \/>\n&nbsp;<br \/>\n\u5047\u8bbe\u6211\u4eec\u6709\u4e00\u4e2a\u6b63\u6570 5\uff0c\u6211\u4eec\u8981\u5b9e\u73b0 5 \u7684\u9636\u4e58\uff0c\u5f97\u5230\u9636\u4e58\u7ed3\u679c 120\uff08PS\uff1a5*4*3*2*1=120\uff09<br \/>\n&nbsp;<br \/>\n\u6211\u4eec\u53ef\u4ee5\u7528\u591a\u79cd\u65b9\u6cd5\u6765\u5b9e\u73b0\uff0c\u6bd4\u5982\uff1a<br \/>\n&nbsp;<br \/>\n<strong>\u65b9\u6cd51\uff1a<\/strong>\u9012\u5f52\u76f8\u4e58\uff08\u4e0b\u4f8b\u5404\u79cd\u793a\u4f8b\u7684if-else \u5faa\u73af \u5e94\u8be5\u628a\u6700\u5927\u53ef\u80fd\u51fa\u73b0\u7684\u60c5\u51b5\u653e\u5728\u7b2c\u4e00\u4e2aif\u5185\u800c\u63d0\u5347\u6027\u80fd\uff0c\u4e3a\u4e86\u5927\u5bb6\u9605\u8bfb\u4ee3\u7801\u65f6\u66f4\u987a\u7545\uff0c\u6240\u4ee5\u6682\u672a\u4f5c\u6b64\u4f18\u5316\uff09<\/p>\n<pre><code class=\"javascript\">\nfunction factorialize(num) { \n    if (num < 0) { \n        return -1; \n    } else if (num === 0 || num === 1) { \n        return 1;\n    } else { \n        return ( num * factorialize(num - 1) );    \/\/\u9012\u5f52\u8c03\u7528\u81ea\u8eab\n    } \n};\nconsole.log( factorialize(5) );\t \/\/120\n\n\n\/\/\u4f18\u5316\uff0c\u5728\u975e\u4e25\u683c\u6a21\u5f0f\u4e0b\uff08\"use strict\"\uff09\uff0c\u51fd\u6570\u540d\u53ef\u4ee5\u7528 arguments.callee \u66ff\u4ee3\uff08\u4e25\u683c\u6a21\u5f0f\u4f7f\u7528arguments.callee\u4f1a\u62a5\u9519\uff09\uff1a\nfunction factorialize(num) {\n    if (num < 0) { \n        return -1; \n    } else if (num === 0 || num === 1) { \n        return 1; \n    } else { \n        return ( num * arguments.callee(num - 1) ); \/\/arguments.callee \u66ff\u4ee3 factorialize\n    } \n};\nconsole.log( factorialize(5) );\t \/\/120\n<\/code><\/pre>\n<p>&nbsp;<br \/>\n<strong>\u65b9\u6cd52\uff1a<\/strong>\u5faa\u73af\u76f8\u4e58<\/p>\n<pre><code class=\"javascript\">\n\/\/\u901a\u8fc7for\u5faa\u73af\u5faa\u73af\u9012\u51cf\u5b9e\u73b0\u9636\u4e58\nfunction factorialize (num) {\n    if (num < 0) {\n        return -1;\n    } else if (num === 0 || num === 1) {\n        return 1;\n    } else {\n        for (var i = num - 1; i >= 1; i--) {    \/\/\u9012\u51cf\n            num *= i;\n        }\n    }\n    return num;\n};\nconsole.log( factorialize(5) );\t \/\/120\n\n\n\/\/\u8fd8\u53ef\u4ee5\u4f7f\u7528\u5faa\u73af\u9012\u52a0\u7684\u65b9\u5f0f\u5b9e\u73b0\uff1a\nfunction factorialize (num) {\n    if (num < 0) {\n        return -1;\n    } else if (num === 0 || num === 1) {\n        return 1;\n    } else {\n    \tvar total = 1;\n        for (var i = 1; i <= num; i++) {    \/\/\u9012\u52a0\n            total *= i;\n        }\n    }\n    return total;\n};\nconsole.log( factorialize(5) );\t \/\/120\n<\/code><\/pre>\n<p>PS\uff1a\u53e6\u5916\u53ef\u4ee5\u4f7f\u7528 while \u5faa\u73af\u7b49\u5176\u5b83\u5f62\u5f0f\u7684\u5faa\u73af\uff0c\u539f\u7406\u4e00\u81f4\uff0c\u53ea\u662f\u4f7f\u7528\u7684\u4e0d\u540c\u5faa\u73af\u65b9\u5f0f\u800c\u5df2<br \/>\n&nbsp;<br \/>\n<strong>\u65b9\u6cd53\uff1a<\/strong>\u901a\u8fc7\u6570\u7ec4\u7684 reduce \u51fd\u6570\u5b9e\u73b0\u9636\u4e58<\/p>\n<pre><code class=\"javascript\">\nfunction factorialize (num) {\n    if (num < 0) {\n        return -1;\n    } else if (num === 0 || num === 1) {\n        return 1;\n    } else {\n    \t\/\/\u5148\u5236\u4f5c\u9012\u589e\u6570\u7ec4\n    \tvar arr = [];\n    \tfor(var i=1; i <= num; i++){\n\t    arr.push(i);\n    \t}\n    \t\/\/reduce\u9636\u4e58\n    \treturn arr.reduce(function(x,y){\n    \t    return x*y;\n    \t});\n    }\n};\nconsole.log( factorialize(5) );\t \/\/120\n<\/code><\/pre>\n<p>\uff08\u5b8c\uff09<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u672c\u6587\u4e3e\u4f8b\u8ba8\u8bba\u5982\u4f55\u89e3\u51fa\u4e00\u4e2a\u6570\u5b57\u9636\u4e58\u3002\u8d1f\u6570\u9636\u4e58\u672c\u8eab\u6ca1\u6709\u591a\u5927\u610f\u4e49\uff0c\u672c\u6587\u793a\u4f8b\u4e3a\u6b63\u6570\u9636\u4e58\u3002 &nbsp; \u5047\u8bbe\u6211\u4eec\u6709\u4e00\u4e2a &hellip; <a href=\"http:\/\/www.imzouyang.com\/blog\/archives\/838.html\" class=\"read-more\">\u7ee7\u7eed\u9605\u8bfb <span class=\"screen-reader-text sr-only\">js\u8da3\u73a9\uff1a\u5b9e\u73b0js\u6570\u5b57\u9636\u4e58\uff08\u6b63\u6570\u9636\u4e58\uff09<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"aside","meta":[],"categories":[30],"tags":[],"_links":{"self":[{"href":"http:\/\/www.imzouyang.com\/blog\/wp-json\/wp\/v2\/posts\/838"}],"collection":[{"href":"http:\/\/www.imzouyang.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.imzouyang.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.imzouyang.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/www.imzouyang.com\/blog\/wp-json\/wp\/v2\/comments?post=838"}],"version-history":[{"count":2,"href":"http:\/\/www.imzouyang.com\/blog\/wp-json\/wp\/v2\/posts\/838\/revisions"}],"predecessor-version":[{"id":2246,"href":"http:\/\/www.imzouyang.com\/blog\/wp-json\/wp\/v2\/posts\/838\/revisions\/2246"}],"wp:attachment":[{"href":"http:\/\/www.imzouyang.com\/blog\/wp-json\/wp\/v2\/media?parent=838"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.imzouyang.com\/blog\/wp-json\/wp\/v2\/categories?post=838"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.imzouyang.com\/blog\/wp-json\/wp\/v2\/tags?post=838"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}