{"id":2976,"date":"2013-01-29T18:00:50","date_gmt":"2013-01-29T10:00:50","guid":{"rendered":"http:\/\/www.zhangxinxu.com\/wordpress\/?p=2976"},"modified":"2018-01-02T02:31:15","modified_gmt":"2018-01-01T18:31:15","slug":"understand-this-of-object-literals","status":"publish","type":"post","link":"https:\/\/www.zhangxinxu.com\/wordpress\/2013\/01\/understand-this-of-object-literals\/","title":{"rendered":"\u6211\u5bf9\u539f\u578b\u5bf9\u8c61\u4e2dthis\u7684\u4e00\u4e2a\u61f5\u61c2\u9519\u8bef\u8ba4\u8bc6"},"content":{"rendered":"

by zhangxinxu<\/a> from http:\/\/www.zhangxinxu.com<\/a>
\n\u672c\u6587\u5730\u5740\uff1ahttp:\/\/www.zhangxinxu.com\/wordpress\/?p=2976<\/a><\/p>\n

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1. \u4e91\u6e38\u56db\u6d77\uff0c\u96c6\u767e\u5bb6\u4e4b\u8a00<\/strong>
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\u2460 \u56fd\u5916\u7ad9\u70b9<\/strong>
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\n\"web\u6280\u672f\u9700\u8981\u4e86\u89e3\u7684\u4e00\u4e9b\u7f51\u7ad9<\/p>\n

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\u2461 \u778e\u6643\u60a0<\/strong>
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\u2462 \u8ba2\u9605<\/strong>
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2. \u90af\u90f8\u5b66\u6b65\uff0c\u4f9d\u846b\u82a6\u753b\u74e2<\/strong>
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\u2462 \u78e8\u5200\u970d\u970d\u5411\u732a\u7f8a<\/strong>
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\u4e8c\u3001\u6211\u60f3\u6784\u5efa\u4e00\u4e2aHash\u65b9\u6cd5<\/h3>\n

\u6211\u60f3\u6784\u5efa\u4e00\u4e2aHash<\/code>\u65b9\u6cd5\uff0c\u4ec0\u4e48\u65f6\u5019\u6709\u8fd9\u4e2a\u60f3\u6cd5\u7684\u5462\uff1f\u4e0d\u8bb0\u5f97\u4e86\uff0c\u53ef\u80fd\u662f\u60a0\u54c9\u62c9\u7fd4\u7684\u65f6\u5019\uff0c\u4e5f\u53ef\u80fd\u662f\u6d51\u5669\u778c\u7761\u7684\u65f6\u5019~~\u5bf9\u81ea\u5df1\u7684\u5b66\u4e60\u6709\u4ec0\u4e48\u7528\u5462\uff1f\u6211\u4e5f\u4e0d\u77e5\u9053\uff0c\u53ea\u662f\u89c9\u5f97\u4e00\u756a\u63e3\u6469\u4e0b\u6765\uff0c\u5e94\u8be5\u4f1a\u6709\u6240\u6536\u83b7~~<\/p>\n

Hash\u4e3a\u4f55\u7269\uff1f<\/strong>
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\n\"MooTools\u7684\u539f\u751f\u7c7b<\/p>\n

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\u7528\u6cd5\u5982\u4e0b\uff1a<\/p>\n

\n
var obj = { a: 0, b: \"1\"}\n    , myHash = new Hash(obj);<\/pre>\n<\/div>\n
\u8fd9\u4e2amyHash<\/code>\u4fdd\u7559\u4e86\u539f\u751fobject <\/code>\u7684\u6240\u6709\u7279\u6027\uff0c\u540c\u65f6\u6709N\u591a\u5176\u4ed6\u6269\u5c55\uff0c\u4f8b\u5982each<\/code>\u65b9\u6cd5\uff08\u904d\u5386\uff09\uff0chasValue<\/code>\u65b9\u6cd5\uff08\u68c0\u6d4b\u662f\u5426\u6709\u67d0\u503c\uff09, map<\/code>\u65b9\u6cd5\uff08\u90fd\u61c2\u7684\uff09\uff0c\u4ee5\u53ca\u6211\u6bd4\u8f83\u559c\u6b22\u7684toQueryString<\/code>\u65b9\u6cd5\uff08\u5bf9\u8c61\u8f6c\u4e3a\u67e5\u8be2\u5b57\u7b26\u4e32\uff09\u7b49\u3002\u5728\u5b9e\u9645\u5904\u7406\u7684\u65f6\u5019\uff0c\u5f88\u597d\u7528\u7684\u3002<\/p>\n
\u6211\u5bf9\u5b9e\u73b0\u6ca1\u5174\u8da3<\/strong>
\n\u8fd9\u79cd\u60f3\u6cd5\u4e0d\u4ec5\u5bf9\u7528\u6237\u5982\u6b64\uff0c\u5bf9\u4e8e\u540c\u884c\u4e4b\u95f4\u4e5f\u662f\u8fd9\u6837\uff1b\u4eba\u4eec\u603b\u662f\u4e50\u4e8e\u63a5\u53d7\u8868\u9762\u7684\u3001\u53ef\u4ee5\u5feb\u901f\u601d\u7ef4\u3001\u4e0d\u635f\u8017\u7cbe\u529b\u7684\u4e8b\u60c5\u3002\u56e0\u6b64\uff0c\u6211\u662f\u4e0d\u4f1a\u611a\u8822\u5230\u7b80\u5355\u7684\u4ee3\u7801\u79c0\uff0c\u5206\u4eab\u81ea\u5df1\u4e00\u70b9\u6240\u5b66\u663e\u7136\u66f4\u6709\u7b80\u5355\u7545\u5feb\u4e4b\u611f\u3002<\/p>\n
\u4e09\u3001\u8fd9\u662f\u4e2a\u5b8c\u6574\u7684\u6545\u4e8b<\/h3>\n
\u4e00\u4e2a\u5b8c\u6574\u7684\u6545\u4e8b\u4f1a\u6709\u8d77\u56e0\uff0c\u7ecf\u8fc7\u4ee5\u53ca\u7ed3\u679c\uff0c\u6211\u5bf9\u5bf9\u8c61\u5b57\u9762\u91cf\u4e2dthis<\/code>\u7684\u8ba4\u8bc6\u4e5f\u662f\u5982\u6b64\u3002<\/p>\n
1. \u4e8b\u60c5\u7684\u8d77\u56e0<\/strong>
\n\u5e73\u65f6\u63a5\u89e6\u7684\u90fd\u662f\u4e0b\u9762\u7684\u6545\u4e8b\uff1a<\/p>\n
\n
var story = {\n    progress: \"unknown\",\n    start: function() {\n        this<\/span>.progress = \"start\";\n    }\n};<\/pre>\n<\/div>\n
\u7136\u540e\u5982\u4e0b\u6267\u884c\u7684\u65f6\u5019\uff0c\u7ed3\u679c\u5c31\u662f\uff1a<\/p>\n
\n
story.start();\nconsole.log(story.progress);<\/pre>\n<\/div>\n
\"\u7ed3\u679c\"<\/p>\n
\u5c06\u6545\u4e8b\u4e2d\u6807\u7ea2\u7684this<\/code>\u6539\u6210story<\/code>\uff0c\u7ed3\u679c\u4e5f\u662f\u4e00\u6837\u7684\uff1a<\/p>\n
\n
var story = {\n    progress: \"unknown\",\n    start: function() {\n        story<\/span>.progress = \"start\";\n    }\n};\n\nstory.start();\nconsole.log(story.progress);<\/pre>\n<\/div>\n
\"\u7ed3\u679c\"<\/p>\n
\u56e0\u6b64\uff0c\u5f88\u81ea\u7136\u800c\u7136\u7684\uff0c\u5728\u7406\u89e3\u4e0a\uff0c\u6211\u5c31\u4f1a\u5c06this<\/code>\u7b49\u540c\u4e8estory<\/code>\uff0c\u4e5f\u5c31\u662fthis<\/code>\u7b49\u4e8e\u8fd9\u4e2a\u5bf9\u8c61\u672c\u8eab\u2460<\/sup>\u3002
\n\"this\u4e0e\u5b57\u9762\u91cf\u5bf9\u8c61\u7684\u7406\u89e3\"<\/p>\n
\/\/zxx: \u2460 \u5b9e\u9645\u4e0athis<\/code>\u5e76\u4e0d\u80fd\u5b8c\u5168\u7b49\u540c\u4e8estory<\/code>\u3002\u5982\u4e0b\u4f8b\u5b50\uff1a
\n\"\u4e0d\u540c\u8c03\u7528\u4e0d\u540c\u7684this\u542b\u4e49\"
\n\u7ed3\u679c\u5c31\u662f”unknown<\/code>“. \/\/zxx: \u6b64\u65f6window.progress\u4e3a”start”;<\/span><\/p>\n
\u800c\u6267\u884cstory<\/span>.progress = \"start\";<\/code>\u7684\u7ed3\u679c\u5219\u4f9d\u7136\u662f\uff1a”start<\/code>“.
\n\"\u4f7f\u7528story.progress\u7684\u7ed3\u679c\"
\n\"\u7ed3\u679c\u622a\u56fe\n<\/p><\/blockquote>\n
2. \u4e8b\u60c5\u7684\u7ecf\u8fc7<\/strong>
\n\u5982\u4e0b\uff0c\u5f88\u7b80\u5355\u7684\u51e0\u884c\u539f\u578b\u76f8\u5173\u7684\u4ee3\u7801\uff1a<\/p>\n
\n
var Story = function() {};\nStory.prototype = {\n    progress: \"unknown\",\n    start: function() {\n        this<\/span>.progress = \"doing\";\n    }\n};\n\nvar myStory = new Story();\nmyStory.start();\nconsole.log(myStory.progress); \/\/ doing<\/green><\/pre>\n<\/div>\n
\u7ed3\u679c\u662fdoing<\/code>\u4e0d\u96be\u77e5\u9053\uff0c\u5173\u952e\u5728\u8ba4\u8bc6\u4e0a\u3002<\/p>\n
prototype<\/code>\u8fd9\u4e1c\u897f\u6709\u70b9\u50cf\u5c4c\u4e1d\u8fc7\u6ee4\u5668\uff0c\u4e0d\u89e3\u91ca\u3002
\n\u6211\u521a\u63a5\u89e6\u539f\u578b\u6982\u5ff5\u7684\u65f6\u5019\uff0c\u88ab\u4e00\u5806\u89e3\u91ca\u6405\u5f97\u5c31\u50cf\u88ab\u629b\u5f03\u5728\u5317\u4eac\u7684\u96fe\u973e\u5929\u6c14\u91cc\uff0c\u4e0d\u4ec5\u770b\u4e0d\u89c1\u65b9\u5411\uff0c\u8fd8\u80f8\u95f7\uff01\u90a3\u79cd\u611f\u89c9\u5c31\u50cf\u662f\u5728\u6b65\u884c\u8857\u4e0a\u9047\u5230\u8fd8\u6ca1\u53c2\u52a0\u8d85\u5973\u7684\u5f20\u542b\u97f5\uff0c\u6211\u4e0d\u8ba4\u8bc6\u5979\uff0c\u5979\u4e5f\u4e0d\u8ba4\u8bc6\u6211\u3002<\/p>\n
\u540e\u6765\uff0c\u751f\u642c\u786c\u5957\uff0c\u56eb\u56f5\u541e\u67a3\uff0c\u4e5f\u80fd\u7528\u7528\uff1a\u641e\u4e9b\u6269\u5c55\u554a\uff0c\u7ee7\u627f\u554a\u4ec0\u4e48\u7684\u3002\u7136\u800c\u591a\u6d6e\u4e8e\u8868\u9762\uff0c\u867d\u4e13\u95e8\u82b1\u4e86\u529f\u592b\u53bb\u6df1\u5165\u7406\u900f\uff0c\u4f46\u56e0\u5927\u96fe\u8fc7\u4e8e\u78c5\u7934\uff0c\u4f9d\u7136\u7406\u4e0d\u6e05\u554a\uff01\u8fd9\u79cd\u611f\u89c9\u5c31\u50cf\u662f\u5f20\u59b9\u5b50\u53c2\u52a0\u8d85\u5973\u7ea2\u4e86\uff0c\u6211\u8ba4\u8bc6\u5979\uff0c\u5979\u5374\u4e0d\u8ba4\u8bc6\u6211\uff0c\u4f46\u662f\u6211\u4ecd\u80fd\u611f\u53d7\u5176\u8868\u9762\u7684\u98ce\u91c7\u3002<\/p>\n
\u5982\u679c\u4ee5\u4e0a\u9762\u8fd9\u79cd\u72b6\u6001\u7406\u89e3\u4e3a\u4f55\u7ed3\u679c\u4e3a”doing<\/code>“\uff0c\u53ef\u80fd\u81ea\u5df1\u90a3\u4e2a\u672a\u7ecf\u6df1\u5165\u601d\u8003\u7684\u7406\u89e3\u5c31\u662f\u9519\u8bef\u7684\u3002<\/p>\n
\u6211\u7684\u9519\u8bef\u7406\u89e3<\/strong>
\n\u6211\u4ee5\u4e3a\uff0c\u5f53\u6267\u884c\u4e86myStory.start();<\/code>\u7684\u65f6\u5019\uff0c\u76f8\u5f53\u4e8e\u8fd9\u4e2a\uff1a<\/p>\n
\n
progress: \"unknown\", \u2192 this.progress = \"doing\";\n\u2193\nprogress: \"unknown\"<\/del> \"doing\",\n\u2193\nmyStory.progress = \"doing\"; \u221a<\/span><\/pre>\n<\/div>\n
\u56fe\u7247\u793a\u610f\u5c31\u662f\uff1a
\n\"\u9519\u8bef\u7406\u89e3\u793a\u610f\"<\/p>\n
\u9a9a\u5e74\uff0c\u4e0d\u8981\u5f00\u5c0f\u5dee\u554a\uff0c\u4e0a\u9762\u7684\u793a\u610f\u662f\u9519\u8bef\u7684.\u9519\u8bef\u7684..\u9519\u8bef\u7684…..<\/strong><\/p>\n
\u9519\u8bef\u7684\u7406\u89e3\u6e90\u4e8e\u201c\u6545\u4e8b\u7684\u5f00\u59cb\u201d – \u666e\u901a\u5bf9\u8c61\u5b57\u9762\u91cf\u4e2d\u7684this<\/code>\u8fd9\u6837\u7406\u89e3\u5f88\u8bf4\u5f97\u901a\u7684\uff1b\u4ee5\u53ca\u5bf9\u539f\u578b\u6d6e\u4e8e\u8868\u9762\u7684\u80a4\u6d45\u8ba4\u77e5\uff08\u6709\u5f88\u591a\u7684\u611f\u6027\u6210\u5206\uff09\u3002<\/p>\n
\u5982\u4f55\u53d1\u73b0\u9519\u8bef\u7684\uff1f<\/strong>
\n\u6240\u8c13\u201c\u5b9e\u8df5\u51fa\u771f\u77e5\u201d\uff0c\u4e00\u70b9\u4e0d\u5047\u3002\u5982\u679c\u6574\u5929\u7761\u5728\u51bb\u5e8a\u4e0a\u4e0d\u77e5\u51b7\u70ed\uff0c\u4f60\u5219\u4f1a\u2014\u2014\u2014\u2014\u2014\u2014\u53d8\u6210\u5c0f\u9f99\u5973\uff01<\/p>\n
\u6211\u7740\u624b\u6784\u5efa\u4e00\u4e2a\u901a\u8fc7new<\/code>\u6784\u9020\u7684\u54c8\u5e0c\u65b9\u6cd5(Hash<\/code>)\uff08\u672c\u6587part2\uff09\uff0c\u5176\u4e2d\uff0c\u6709\u4e2a\u5f88\u65b9\u6cd5\uff0c\u53eb\u505ahas<\/code>, \u7528\u6765\u68c0\u6d4b\u5bf9\u8c61\u662f\u5426\u6709\u67d0\u5173\u952e\u5b57\uff08\u952e\u503c\u5bf9\u4e2d\u7684\u952e\uff09\uff08\u4e0d\u5305\u62ec\u539f\u578b\u4e2d\u7684\uff09\u3002\u5176\u5b9e\u672c\u8d28\u4e0a\u5c31\u662fhasOwnProperty<\/code>\u65b9\u6cd5\u3002<\/p>\n
\u4f8b\u5982\u4e0a\u9762\u90a3\u4e2amyStory<\/code>\u5b9e\u4f8b\uff0c\u7ee7\u7eed\u4e0b\u9762\u7684\u68c0\u6d4b\u4ee3\u7801\uff1a<\/p>\n
\n
console.log(myStory.hasOwnProperty(\"progress\")); \nconsole.log(myStory.hasOwnProperty(\"start\")); <\/pre>\n<\/div>\n
\"\u6d4b\u8bd5\u4ee3\u7801\"<\/p>\n
\u7ed3\u679c\u662f\u4ec0\u4e48\u5462\uff1f\u8bf7\u9009\u62e9<\/strong>\uff1a
\n