{"id":926,"date":"2011-06-20T10:55:56","date_gmt":"2011-06-20T02:55:56","guid":{"rendered":"http:\/\/leegorous.net\/blog\/?p=926"},"modified":"2012-03-03T19:10:50","modified_gmt":"2012-03-03T11:10:50","slug":"about-function","status":"publish","type":"post","link":"http:\/\/leegorous.net\/blog\/2011\/06\/20\/about-function\/","title":{"rendered":"\u51fd\u6570\u62bd\u8c61"},"content":{"rendered":"<p>JavaScript \u91cc <a href=\"https:\/\/developer.mozilla.org\/en\/JavaScript\/Reference\/Global_Objects\/Array\" target=\"_blank\">Array<\/a> \u975e\u5e38\u5e38\u7528\u3002\u8fd8\u8bb0\u5f97\u5f53\u521d\u662f\u56e0\u4e3a\u76f4\u63a5\u5b57\u7b26\u4e32\u62fc\u63a5\u6548\u7387\u597d\u5dee\uff0c\u4f46\u662f\u7528 [&#8230;].join(&#8221;) \u5374\u795e\u5947\u5730\u5feb\u800c\u4f7f\u6211\u5370\u8c61\u6df1\u523b\u3002<\/p>\n<p>\u5728 JavaScript 1.6 \u91cc\u8fd8\u5f15\u5165\u4e86\u4e00\u4e9b\u65b0\u7684\u65b9\u6cd5\uff0c\u867d\u7136\u6709\u4e9b\u770b\u4e0a\u53bb\u597d\u50cf\u6ca1\u4ec0\u4e48\u7279\u522b\uff0c\u751a\u81f3\u4f1a\u4f7f\u4eba\u7591\u60d1\u4e3a\u4ec0\u4e48\u9700\u8981\u591a\u8fd9\u4e48\u4e2a\u65b9\u6cd5\u3002\u6211\u5f88\u597d\u5947\u8fd9\u662f\u57fa\u4e8e\u4ec0\u4e48\u8bbe\u8ba1\u51fa\u6765\u7684\u3002<\/p>\n<p>\u5fd8\u8bb0\u4e86\u662f\u4ece\u54ea\u91cc\u770b\u6765\u7684\uff0c\u8bf4\u4e00\u4e9b\u65b9\u6cd5\u662f\u4e3a\u4e86\u53ef\u4ee5\u652f\u6301\u51fd\u6570\u5f0f\u7f16\u7a0b\u800c\u5f15\u5165\u7684\u3002\u6bd4\u5982 <a href=\"https:\/\/developer.mozilla.org\/en\/JavaScript\/Reference\/Global_Objects\/Array\/forEach\">forEach<\/a>, <a href=\"https:\/\/developer.mozilla.org\/en\/JavaScript\/Reference\/Global_Objects\/Array\/filter\">filter<\/a>, <a href=\"https:\/\/developer.mozilla.org\/en\/JavaScript\/Reference\/Global_Objects\/Array\/every\">every<\/a>, <a href=\"https:\/\/developer.mozilla.org\/en\/JavaScript\/Reference\/Global_Objects\/Array\/map\">map<\/a>, <a href=\"https:\/\/developer.mozilla.org\/en\/JavaScript\/Reference\/Global_Objects\/Array\/Reduce\">reduce<\/a>\u3002<\/p>\n<p>\u5b9e\u9645\u4f7f\u7528\u8fc7\u540e\uff0c\u8fd8\u771f\u662f\u5c1d\u5230\u751c\u5934\u4e86\u3002\u6700\u76f4\u63a5\u7684\u611f\u89c9\u5c31\u662f\uff0c\u4ee3\u7801\u53d8\u77ed\u4e86\uff08\u4e0d\u662f\u5b57\u7b26\u6570\uff0c\u800c\u662f\u72ec\u7acb\u7684\u8bed\u6cd5\u5355\u4f4d\u6570\u91cf\uff09\u3002\u6bd4\u5982 every <\/p>\n<p>\u5982\u679c\u6ca1\u6709\u5b83\uff0c\u4f60\u9700\u8981\u5199\u8fd9\u4e9b\u4ee3\u7801<\/p>\n<pre name=\"code\" class=\"brush: js\">\r\nvar arr = [15, 20, 30];\r\nvar isbigger = true;\r\nfor (var i = 0; i &lt; arr.length; i++) {\r\n    if (!(arr[i] &gt; 10))  {\r\n        isbigger = false;\r\n        break;\r\n    }\r\n}\r\nisbigger === true\r\n<\/pre>\n<p>\u6709\u4e86\u5b83\uff0c\u4f60\u53ef\u4ee5\u8fd9\u6837\u5199<\/p>\n<pre name=\"code\" class=\"brush: js\">\r\nvar arr = [15, 20, 30];\r\narr.every(function(it) {\r\n    return it &gt; 10;\r\n}) === true;\r\n<\/pre>\n<p>\u5c11\u5b9a\u4e49\u4e86\u4e00\u4e2a\u53d8\u91cf isbigger, \u6ca1\u6709\u4e86 for \u5faa\u73af\uff0c\u81ea\u7136\u4e5f\u4e0d\u9700\u8981\u8003\u8651\u4ec0\u4e48\u65f6\u5019 break \u4e86\u3002\u9700\u8981\u505a\u7684\u5224\u65ad\u53ef\u4ee5\u975e\u5e38\u6e05\u6670\u5730\u7528 it > 10 \u8868\u8fbe\u51fa\u6765\u3002\u771f\u662f\u7b80\u5355\u660e\u5feb\u3002<\/p>\n<p>\u6216\u8bb8\u60f3\u8981\u8868\u8fbe\u7684\u5c31\u662f\u8fd9\u79cd\u62bd\u8c61\u65b9\u5f0f\uff0c\u5c06\u67d0\u79cd\u7279\u5b9a\u8fc7\u7a0b\u62bd\u8c61\u6210\u4e00\u4e2a every\uff0c\u4f7f\u7528\u8005\u53ef\u4ee5\u53ea\u5173\u5fc3\u6240\u9700\u8981\u7684\u903b\u8f91\u3002\u800c\u8fd9\u4e2a\u903b\u8f91\u662f\u7528\u4e00\u4e2a\u51fd\u6570\u6765\u8868\u793a\u7684\uff0c\u4f5c\u4e3a\u53c2\u6570\u4f20\u5165\u5230 every \u5f53\u4e2d\u53bb\u3002\u7531\u4e8e JavaScript \u652f\u6301\u51fd\u6570\u4f5c\u4e3a\u53c2\u6570\uff0c\u4f7f\u5f97\u4f7f\u7528\u51fd\u6570\u6765\u62bd\u8c61\u975e\u5e38\u7684\u65b9\u4fbf\uff0c\u4e0d\u9700\u8981\u989d\u5916\u6784\u5efa\u4e00\u4e9b\u6a21\u5f0f\u6765\u8fdb\u884c\u80f6\u8fde\u3002\u5982\u679c\u4ece\u8fd9\u4e2a\u89d2\u5ea6\u770b\uff0c\u7684\u786e\u5f88\u7b26\u5408\u51fd\u6570\u5f0f\u7f16\u7a0b\u7684\u6a21\u5f0f\u3002<\/p>\n<p>\u518d\u770b\u770b every \u7684\u5b9e\u73b0\uff0c\u548c\u7b2c\u4e00\u6bb5\u4ee3\u7801\u7684\u4e3b\u4f53\u662f\u975e\u5e38\u7684\u76f8\u50cf\u7684\u3002<\/p>\n<pre name=\"code\" class=\"brush: js\">\r\n\/**\r\n * Copyright (c) Mozilla Foundation http:\/\/www.mozilla.org\/\r\n * This code is available under the terms of the MIT License\r\n *\/\r\nif (!Array.prototype.every) {\r\n    Array.prototype.every = function(fun \/*, thisp*\/) {\r\n        var len = this.length &gt;&gt;&gt; 0;\r\n        if (typeof fun != &quot;function&quot;) {\r\n            throw new TypeError();\r\n        }\r\n\r\n        var thisp = arguments[1];\r\n        for (var i = 0; i &lt; len; i++) {\r\n            if (i in this &amp;&amp; !fun.call(thisp, this[i], i, this)) {\r\n                return false;\r\n            }\r\n        }\r\n\r\n        return true;\r\n    };\r\n}\r\n<\/pre>\n<p>\u5c31\u8fd9\u6837\u4e00\u4e2a\u72ec\u7acb\u529f\u80fd\u7684\u7b80\u5355\u51fd\u6570\u5c31\u53ef\u4ee5\u5b9e\u73b0\u5173\u6ce8\u70b9\u7684\u5206\u79bb\u3002\u800c\u4e14\uff0c\u5206\u79bb\u4e4b\u540e\uff0c\u5404\u81ea\u90fd\u53ef\u4ee5\u5f88\u597d\u5730\u6d4b\u8bd5\uff0c\u5173\u6ce8\u70b9\u7684\u5355\u4e00\uff0c\u4f7f\u5f97\u6d4b\u8bd5\u66f4\u52a0\u5bb9\u6613\u8fdb\u884c\u3002\u529f\u80fd\u53d8\u5f97\u7b80\u5355\uff08\u4e13\u6ce8\uff09\u4e86\uff0c\u5c11\u6253\u4e86\u8bb8\u591a\u5b57\uff0c\u4ee3\u7801\u66f4\u52a0\u6e05\u6670\u6613\u61c2\uff0c\u51fa\u9519\u7684\u51e0\u7387\u4e5f\u76f8\u5e94\u5730\u51cf\u5c11\u3002\u51fa\u9519\u5c11\u4e86\uff0c\u4f60\u4f1a\u611f\u89c9\u662f\u81ea\u5df1\u53d8\u806a\u660e\u4e86\uff08Ruby \u521b\u59cb\u4eba\u5728\u4e00\u6b21\u6f14\u8bb2\u4e2d\u8bf4\u5230\u7684\u4e00\u4e2a\u5f88\u6709\u8da3\u7684\u89c2\u70b9\uff09\u3002<\/p>\n<p>\u540c\u6837\u7684\u539f\u7406\uff0c\u6211\u89c9\u5f97\u662f\u53ef\u4ee5\u5f88\u65b9\u4fbf\u5730\u5e94\u7528\u5230\u81ea\u5df1\u7f16\u5199\u7684\u4ee3\u7801\u5f53\u4e2d\u53bb\uff0c\u4ed4\u7ec6\u5206\u6790\u4ee3\u7801\uff0c\u5206\u79bb\u4e0d\u540c\u7684\u5173\u6ce8\u70b9\uff0c\u662f\u5b9e\u73b0\u81ea\u4e0b\u800c\u4e0a\u7684\u7f16\u7a0b\u65b9\u5f0f\u7684\u91cd\u8981\u4e00\u73af\u3002<\/p>\n<p>\u4e5f\u8bb8\u770b\u4e0a\u53bb\u5f88\u7b80\u5355\uff0c\u4f46\u662f\u6211\u89c9\u5f97\u8fd9\u79cd\u62bd\u8c61\u65b9\u5f0f\u4f5c\u4e3a\u4e00\u4e2a\u5f88\u597d\u7684\u57fa\u7840\uff0c\u53ef\u4ee5\u5e2e\u52a9\u6211\u4eec\u8bbe\u8ba1\u51fa\u66f4\u597d\u7684\u4ee3\u7801\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>JavaScript \u91cc Array \u975e\u5e38\u5e38\u7528\u3002\u8fd8\u8bb0\u5f97\u5f53\u521d\u662f\u56e0\u4e3a\u76f4\u63a5\u5b57\u7b26\u4e32\u62fc\u63a5\u6548\u7387\u597d\u5dee\uff0c\u4f46\u662f\u7528 [&#038;#8230 &hellip; <\/p>\n<p class=\"link-more\"><a href=\"http:\/\/leegorous.net\/blog\/2011\/06\/20\/about-function\/\" class=\"more-link\">\u7ee7\u7eed\u9605\u8bfb<span class=\"screen-reader-text\">\u201c\u51fd\u6570\u62bd\u8c61\u201d<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[102],"tags":[64,9],"_links":{"self":[{"href":"http:\/\/leegorous.net\/blog\/wp-json\/wp\/v2\/posts\/926"}],"collection":[{"href":"http:\/\/leegorous.net\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/leegorous.net\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/leegorous.net\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/leegorous.net\/blog\/wp-json\/wp\/v2\/comments?post=926"}],"version-history":[{"count":3,"href":"http:\/\/leegorous.net\/blog\/wp-json\/wp\/v2\/posts\/926\/revisions"}],"predecessor-version":[{"id":1056,"href":"http:\/\/leegorous.net\/blog\/wp-json\/wp\/v2\/posts\/926\/revisions\/1056"}],"wp:attachment":[{"href":"http:\/\/leegorous.net\/blog\/wp-json\/wp\/v2\/media?parent=926"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/leegorous.net\/blog\/wp-json\/wp\/v2\/categories?post=926"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/leegorous.net\/blog\/wp-json\/wp\/v2\/tags?post=926"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}