{"id":1488,"date":"2014-06-10T19:08:27","date_gmt":"2014-06-10T11:08:27","guid":{"rendered":"http:\/\/leegorous.net\/blog\/?p=1488"},"modified":"2014-06-10T19:08:27","modified_gmt":"2014-06-10T11:08:27","slug":"javascript-hashcode-function","status":"publish","type":"post","link":"http:\/\/leegorous.net\/blog\/2014\/06\/10\/javascript-hashcode-function\/","title":{"rendered":"Javascript hashCode \u51fd\u6570"},"content":{"rendered":"<p>\u7f51\u4e0a\u627e\u4e86\u597d\u4e00\u8f6e\uff0c\u627e\u5230\u4e2a<a href=\"http:\/\/werxltd.com\/wp\/2010\/05\/13\/javascript-implementation-of-javas-string-hashcode-method\/#comment-38551\" target=\"_blank\">\u6bd4\u8f83\u50cf\u6837\u800c\u4e14\u8db3\u591f\u77ed\u7684 hashCode \u5b9e\u73b0<\/a>\uff0c\u662f\u4ece Java \u7684 hashCode \u4e2d\u501f\u9274\u800c\u5f97\u7684\u3002\u539f\u7406\u89c1 <a href=\"http:\/\/en.wikipedia.org\/wiki\/Java_hashCode()\" title=\"Java hashCode()\" target=\"_blank\">Java hashCode() <\/a> \uff0c\u4e5f\u53ef\u4ee5\u8ddf\u8fd9\u91cc\u7684 <a href=\"http:\/\/hg.openjdk.java.net\/jdk7u\/jdk7u6\/jdk\/file\/8c2c5d63a17e\/src\/share\/classes\/java\/lang\/String.java\" title=\"Java String\" target=\"_blank\">Java String \u7684\u6e90\u7801<\/a> \u53c2\u7167\u5bf9\u6bd4\u4e00\u4e0b\u3002<\/p>\n<p>\u4e3a\u4e86\u4f7f\u7528\u7684\u65b9\u4fbf\uff0c\u7a0d\u7a0d\u518d\u6539\u826f\u4e86\u4e00\u4e0b<\/p>\n<pre class=\"brush: javascript;\">\r\nfunction hashcode(str) {\r\n  var hash = 0, i, chr, len;\r\n  if (str.length === 0) return hash;\r\n  for (i = 0, len = str.length; i &lt; len; i++) {\r\n    chr   = str.charCodeAt(i);\r\n    hash  = ((hash &lt;&lt; 5) - hash) + chr;\r\n    hash |= 0; \/\/ Convert to 32bit integer\r\n  }\r\n  return hash;\r\n}\r\n\r\nhashcode(&quot;this is a string&quot;)\r\n\/\/-1853110172\r\n<\/pre>\n<p>\u8fd9\u91cc\u63a5\u53d7\u7684\u53c2\u6570\u662f\u4e00\u4e2a String\uff0c\u5176\u5b83\u7c7b\u578b\u600e\u4e48\u529e\uff1f\u53ef\u4ee5\u5148\u505a\u4e00\u4e2a\u7edf\u4e00\u7684\u5904\u7406\uff0c\u6bd4\u5982<\/p>\n<pre class=\"brush: javascript;\">\r\nhashcode(JSON.stringify(obj))\r\n<\/pre>\n<p>\u5e8f\u5217\u5316\u4e4b\u540e\u518d\u4f7f\u7528 hashCode \u51fd\u6570\uff0c\u57fa\u672c\u6240\u6709\u7c7b\u578b\u6570\u636e\u90fd\u901a\u5403\uff0c\u9664\u4e86\u542b\u6709\u5faa\u73af\u5d4c\u5957\u7684\u5bf9\u8c61\u3002<\/p>\n<p>PS\uff1a<br \/>\n\u51fd\u6570\u5b9e\u73b0\u4e2d\u6709\u4e00\u884c\u4f7f\u7528\u4e86 \u201c|\u201d \u8fd0\u7b97\u7b26\uff0c\u53ea\u662f\u5229\u7528 <a href=\"https:\/\/developer.mozilla.org\/en\/docs\/Web\/JavaScript\/Reference\/Operators\/Bitwise_Operators\" target=\"_blank\">Bitwise \u8fd0\u7b97\u7b26\u8f6c\u6362\u53c2\u6570\u4e3a 32bit<\/a>\uff0c\u7528\u6765\u786e\u4fdd\u7ed3\u679c\u662f\u4e2a 32\u4f4d\u6574\u6570\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u7f51\u4e0a\u627e\u4e86\u597d\u4e00\u8f6e\uff0c\u627e\u5230\u4e2a\u6bd4\u8f83\u50cf\u6837\u800c\u4e14\u8db3\u591f\u77ed\u7684 hashCode \u5b9e\u73b0\uff0c\u662f\u4ece Java \u7684 hashCode \u4e2d\u501f &hellip; <\/p>\n<p class=\"link-more\"><a href=\"http:\/\/leegorous.net\/blog\/2014\/06\/10\/javascript-hashcode-function\/\" class=\"more-link\">\u7ee7\u7eed\u9605\u8bfb<span class=\"screen-reader-text\">\u201cJavascript hashCode \u51fd\u6570\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":[9],"_links":{"self":[{"href":"http:\/\/leegorous.net\/blog\/wp-json\/wp\/v2\/posts\/1488"}],"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=1488"}],"version-history":[{"count":4,"href":"http:\/\/leegorous.net\/blog\/wp-json\/wp\/v2\/posts\/1488\/revisions"}],"predecessor-version":[{"id":1492,"href":"http:\/\/leegorous.net\/blog\/wp-json\/wp\/v2\/posts\/1488\/revisions\/1492"}],"wp:attachment":[{"href":"http:\/\/leegorous.net\/blog\/wp-json\/wp\/v2\/media?parent=1488"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/leegorous.net\/blog\/wp-json\/wp\/v2\/categories?post=1488"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/leegorous.net\/blog\/wp-json\/wp\/v2\/tags?post=1488"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}