127.0.0.1:9200<br>URL: http://127.0.0.1:9200/likecs_art_db/_search<br>REQUEST:<pre>Array
(
    [query] => Array
        (
            [match] => Array
                (
                    [text] => Array
                        (
                            [query] => JavaScript 判断对象中是否有某属性
                        )

                )

        )

    [highlight] => Array
        (
            [fields] => Array
                (
                    [text] => stdClass Object
                        (
                        )

                )

            [pre_tags] => #em#
            [post_tags] => #/em#
        )

    [size] => 8
    [from] => 0
)
</pre>RESPONSE:<pre>string(8531) "{"took":24,"timed_out":false,"_shards":{"total":1,"successful":1,"skipped":0,"failed":0},"hits":{"total":{"value":10000,"relation":"gte"},"max_score":57.37968,"hits":[{"_index":"likecs_art_db","_type":"_doc","_id":"21563","_score":57.37968,"_source":{"id":"21563","text":"JavaScript \u5224\u65ad\u5bf9\u8c61\u4e2d\u662f\u5426\u6709\u67d0\u5c5e\u6027","intro":"\u76ee\u5f55\n\nECharts\n\u5f02\u6b65\u52a0\u8f7d\n\n\n\nECharts\r\n\u6570\u636e\u53ef\u89c6\u5316\u5728\u8fc7\u53bb\u51e0\u5e74\u4e2d\u53d6\u5f97\u4e86\u5de8\u5927\u8fdb\u5c55\u3002\u5f00\u53d1\u4eba\u5458\u5bf9\u53ef\u89c6\u5316\u4ea7\u54c1\u7684\u671f\u671b\u4e0d\u518d\u662f\u7b80\u5355\u7684\u56fe\u8868\u521b\u5efa\u5de5\u5177\uff0c\u800c\u662f\u5728\u4ea4\u4e92\u3001\u6027\u80fd\u3001\u6570\u636e\u5904\u7406\u7b49\u65b9\u9762\u6709\u66f4\u9ad8\u7684\u8981\u6c42\u3002\r\nchart.setOption({\r\n    color: [\r\n        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","username":"qianxiaox","tagsname":"","tagsid":"","catesname":null,"catesid":"","createtime":"1634381006"},"highlight":{"text":["js#em#判#/em##em#断#/em##em#对#/em##em#象#/em##em#是#/em##em#否#/em#为空#em#对#/em##em#象#/em#，#em#判#/em##em#断#/em##em#对#/em##em#象#/em##em#中#/em##em#是#/em##em#否#/em##em#有#/em##em#某#/em##em#属#/em##em#性#/em#"]}},{"_index":"likecs_art_db","_type":"_doc","_id":"738899","_score":47.649773,"_source":{"id":"738899","text":"javascript\u5982\u4f55\u5224\u65ad\u5bf9\u8c61\u662f\u5426\u5305\u542b\u67d0\u5c5e\u6027\uff1f","intro":"\u76ee\u5f55\n\nECharts\n\u5f02\u6b65\u52a0\u8f7d\n\n\n\nECharts\r\n\u6570\u636e\u53ef\u89c6\u5316\u5728\u8fc7\u53bb\u51e0\u5e74\u4e2d\u53d6\u5f97\u4e86\u5de8\u5927\u8fdb\u5c55\u3002\u5f00\u53d1\u4eba\u5458\u5bf9\u53ef\u89c6\u5316\u4ea7\u54c1\u7684\u671f\u671b\u4e0d\u518d\u662f\u7b80\u5355\u7684\u56fe\u8868\u521b\u5efa\u5de5\u5177\uff0c\u800c\u662f\u5728\u4ea4\u4e92\u3001\u6027\u80fd\u3001\u6570\u636e\u5904\u7406\u7b49\u65b9\u9762\u6709\u66f4\u9ad8\u7684\u8981\u6c42\u3002\r\nchart.setOption({\r\n 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","username":"crackedlove","tagsname":"","tagsid":"","catesname":"","catesid":"","createtime":"1638849774"},"highlight":{"text":["JS如何#em#判#/em##em#断#/em#一个#em#对#/em##em#象#/em##em#是#/em##em#否#/em#为空、#em#是#/em##em#否#/em##em#有#/em##em#某#/em#个#em#属#/em##em#性#/em#"]}},{"_index":"likecs_art_db","_type":"_doc","_id":"738915","_score":42.35935,"_source":{"id":"738915","text":"JavaScript\u5224\u65ad\u5bf9\u8c61\u662f\u5426\u5305\u542b\u67d0\u4e2a\u5c5e\u6027\u7684\u51e0\u79cd\u65b9\u6cd5","intro":"\u76ee\u5f55\n\nECharts\n\u5f02\u6b65\u52a0\u8f7d\n\n\n\nECharts\r\n\u6570\u636e\u53ef\u89c6\u5316\u5728\u8fc7\u53bb\u51e0\u5e74\u4e2d\u53d6\u5f97\u4e86\u5de8\u5927\u8fdb\u5c55\u3002\u5f00\u53d1\u4eba\u5458\u5bf9\u53ef\u89c6\u5316\u4ea7\u54c1\u7684\u671f\u671b\u4e0d\u518d\u662f\u7b80\u5355\u7684\u56fe\u8868\u521b\u5efa\u5de5\u5177\uff0c\u800c\u662f\u5728\u4ea4\u4e92\u3001\u6027\u80fd\u3001\u6570\u636e\u5904\u7406\u7b49\u65b9\u9762\u6709\u66f4\u9ad8\u7684\u8981\u6c42\u3002\r\nchart.setOption({\r\n    color: [\r\n        ","username":"cyfeng","tagsname":"","tagsid":"","catesname":null,"catesid":"","createtime":"1636232589"},"highlight":{"text":["#em#JavaScript#/em##em#判#/em##em#断#/em##em#对#/em##em#象#/em##em#是#/em##em#否#/em#包含#em#某#/em#个#em#属#/em##em#性#/em#的几种方法"]}},{"_index":"likecs_art_db","_type":"_doc","_id":"497537","_score":41.905342,"_source":{"id":"497537","text":"[\u8f6c]JS\u5982\u4f55\u5224\u65ad\u4e00\u4e2a\u5bf9\u8c61\u662f\u5426\u4e3a\u7a7a\u3001\u662f\u5426\u6709\u67d0\u4e2a\u5c5e\u6027","intro":"\u76ee\u5f55\n\nECharts\n\u5f02\u6b65\u52a0\u8f7d\n\n\n\nECharts\r\n\u6570\u636e\u53ef\u89c6\u5316\u5728\u8fc7\u53bb\u51e0\u5e74\u4e2d\u53d6\u5f97\u4e86\u5de8\u5927\u8fdb\u5c55\u3002\u5f00\u53d1\u4eba\u5458\u5bf9\u53ef\u89c6\u5316\u4ea7\u54c1\u7684\u671f\u671b\u4e0d\u518d\u662f\u7b80\u5355\u7684\u56fe\u8868\u521b\u5efa\u5de5\u5177\uff0c\u800c\u662f\u5728\u4ea4\u4e92\u3001\u6027\u80fd\u3001\u6570\u636e\u5904\u7406\u7b49\u65b9\u9762\u6709\u66f4\u9ad8\u7684\u8981\u6c42\u3002\r\nchart.setOption({\r\n    color: [\r\n        ","username":"dirgo","tagsname":"","tagsid":"","catesname":"","catesid":"","createtime":"1638849778"},"highlight":{"text":["[转]JS如何#em#判#/em##em#断#/em#一个#em#对#/em##em#象#/em##em#是#/em##em#否#/em#为空、#em#是#/em##em#否#/em##em#有#/em##em#某#/em#个#em#属#/em##em#性#/em#"]}},{"_index":"likecs_art_db","_type":"_doc","_id":"738919","_score":41.650887,"_source":{"id":"738919","text":"js\u5224\u65ad\u5bf9\u8c61\u662f\u5426\u5305\u542b\u67d0\u4e2a(\u5b57\u6bb5)\u5c5e\u6027","intro":"\u76ee\u5f55\n\nECharts\n\u5f02\u6b65\u52a0\u8f7d\n\n\n\nECharts\r\n\u6570\u636e\u53ef\u89c6\u5316\u5728\u8fc7\u53bb\u51e0\u5e74\u4e2d\u53d6\u5f97\u4e86\u5de8\u5927\u8fdb\u5c55\u3002\u5f00\u53d1\u4eba\u5458\u5bf9\u53ef\u89c6\u5316\u4ea7\u54c1\u7684\u671f\u671b\u4e0d\u518d\u662f\u7b80\u5355\u7684\u56fe\u8868\u521b\u5efa\u5de5\u5177\uff0c\u800c\u662f\u5728\u4ea4\u4e92\u3001\u6027\u80fd\u3001\u6570\u636e\u5904\u7406\u7b49\u65b9\u9762\u6709\u66f4\u9ad8\u7684\u8981\u6c42\u3002\r\nchart.setOption({\r\n    color: [\r\n        ","username":"lifan12589","tagsname":"","tagsid":"","catesname":null,"catesid":"","createtime":"1636232591"},"highlight":{"text":["js#em#判#/em##em#断#/em##em#对#/em##em#象#/em##em#是#/em##em#否#/em#包含#em#某#/em#个(字段)#em#属#/em##em#性#/em#"]}}]}}"
</pre>127.0.0.1:9200<br>URL: http://127.0.0.1:9200/likecs_art_db/_search<br>REQUEST:<pre>Array
(
    [query] => Array
        (
            [match] => Array
                (
                    [text] => Array
                        (
                            [query] => JavaScript 判断对象中是否有某属性
                        )

                )

        )

    [highlight] => Array
        (
            [fields] => Array
                (
                    [text] => stdClass Object
                        (
                        )

                )

            [pre_tags] => #em#
            [post_tags] => #/em#
        )

    [size] => 8
    [from] => 8
)
</pre>RESPONSE:<pre>string(8514) "{"took":25,"timed_out":false,"_shards":{"total":1,"successful":1,"skipped":0,"failed":0},"hits":{"total":{"value":10000,"relation":"gte"},"max_score":57.37968,"hits":[{"_index":"likecs_art_db","_type":"_doc","_id":"497566","_score":38.56413,"_source":{"id":"497566","text":"js\u5224\u65ad\u4e00\u4e2a\u5bf9\u8c61{}\u662f\u5426\u4e3a\u7a7a\u5bf9\u8c61\uff0c\u6ca1\u6709\u4efb\u4f55\u5c5e\u6027","intro":"\u76ee\u5f55\n\nECharts\n\u5f02\u6b65\u52a0\u8f7d\n\n\n\nECharts\r\n\u6570\u636e\u53ef\u89c6\u5316\u5728\u8fc7\u53bb\u51e0\u5e74\u4e2d\u53d6\u5f97\u4e86\u5de8\u5927\u8fdb\u5c55\u3002\u5f00\u53d1\u4eba\u5458\u5bf9\u53ef\u89c6\u5316\u4ea7\u54c1\u7684\u671f\u671b\u4e0d\u518d\u662f\u7b80\u5355\u7684\u56fe\u8868\u521b\u5efa\u5de5\u5177\uff0c\u800c\u662f\u5728\u4ea4\u4e92\u3001\u6027\u80fd\u3001\u6570\u636e\u5904\u7406\u7b49\u65b9\u9762\u6709\u66f4\u9ad8\u7684\u8981\u6c42\u3002\r\nchart.setOption({\r\n    color: [\r\n        ","username":"cczlovexw","tagsname":"","tagsid":"","catesname":"","catesid":"","createtime":"1634381019"},"highlight":{"text":["js#em#判#/em##em#断#/em#一个#em#对#/em##em#象#/em#{}#em#是#/em##em#否#/em#为空#em#对#/em##em#象#/em#，没#em#有#/em#任何#em#属#/em##em#性#/em#"]}},{"_index":"likecs_art_db","_type":"_doc","_id":"714123","_score":37.827965,"_source":{"id":"714123","text":"JS\u4e4b\u5224\u65adjson\u5bf9\u8c61\u4e2d\u662f\u5426\u542b\u6709\u67d0\u4e2akey\u503c","intro":"\u76ee\u5f55\n\nECharts\n\u5f02\u6b65\u52a0\u8f7d\n\n\n\nECharts\r\n\u6570\u636e\u53ef\u89c6\u5316\u5728\u8fc7\u53bb\u51e0\u5e74\u4e2d\u53d6\u5f97\u4e86\u5de8\u5927\u8fdb\u5c55\u3002\u5f00\u53d1\u4eba\u5458\u5bf9\u53ef\u89c6\u5316\u4ea7\u54c1\u7684\u671f\u671b\u4e0d\u518d\u662f\u7b80\u5355\u7684\u56fe\u8868\u521b\u5efa\u5de5\u5177\uff0c\u800c\u662f\u5728\u4ea4\u4e92\u3001\u6027\u80fd\u3001\u6570\u636e\u5904\u7406\u7b49\u65b9\u9762\u6709\u66f4\u9ad8\u7684\u8981\u6c42\u3002\r\nchart.setOption({\r\n    color: [\r\n        ","username":"xiaozhouyuxiaohou","tagsname":"","tagsid":"","catesname":"","catesid":"","createtime":"1636087892"},"highlight":{"text":["JS之#em#判#/em##em#断#/em#json#em#对#/em##em#象#/em##em#中#/em##em#是#/em##em#否#/em#含#em#有#/em##em#某#/em#个key值"]}},{"_index":"likecs_art_db","_type":"_doc","_id":"738910","_score":37.636925,"_source":{"id":"738910","text":"js\u5224\u65ad\u5bf9\u8c61\u6570\u7ec4\u4e2d\u662f\u5426\u5b58\u5728\u67d0\u4e2a\u5bf9\u8c61","intro":"\u76ee\u5f55\n\nECharts\n\u5f02\u6b65\u52a0\u8f7d\n\n\n\nECharts\r\n\u6570\u636e\u53ef\u89c6\u5316\u5728\u8fc7\u53bb\u51e0\u5e74\u4e2d\u53d6\u5f97\u4e86\u5de8\u5927\u8fdb\u5c55\u3002\u5f00\u53d1\u4eba\u5458\u5bf9\u53ef\u89c6\u5316\u4ea7\u54c1\u7684\u671f\u671b\u4e0d\u518d\u662f\u7b80\u5355\u7684\u56fe\u8868\u521b\u5efa\u5de5\u5177\uff0c\u800c\u662f\u5728\u4ea4\u4e92\u3001\u6027\u80fd\u3001\u6570\u636e\u5904\u7406\u7b49\u65b9\u9762\u6709\u66f4\u9ad8\u7684\u8981\u6c42\u3002\r\nchart.setOption({\r\n    color: [\r\n        ","username":"leiting","tagsname":"","tagsid":"","catesname":"","catesid":"","createtime":"1636232584"},"highlight":{"text":["js#em#判#/em##em#断#/em##em#对#/em##em#象#/em#数组#em#中#/em##em#是#/em##em#否#/em#存在#em#某#/em#个#em#对#/em##em#象#/em#"]}},{"_index":"likecs_art_db","_type":"_doc","_id":"738923","_score":36.6512,"_source":{"id":"738923","text":"js\u5224\u65ad\u5bf9\u8c61\u6570\u7ec4\u4e2d\u662f\u5426\u5b58\u5728\u67d0\u4e2a\u5bf9\u8c61 - 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</pre>127.0.0.1:9200<br>URL: http://192.168.101.128/searchcore/index.php/cihere_cn_db/_search<br>REQUEST:<pre>Array
(
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        (
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                (
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                        (
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                        )

                )

        )

    [highlight] => Array
        (
            [fields] => Array
                (
                    [title] => stdClass Object
                        (
                        )

                )

            [pre_tags] => #em#
            [post_tags] => #/em#
        )

    [from] => 0
)
</pre>RESPONSE:<pre>bool(false)
</pre>127.0.0.1:9200<br>URL: http://127.0.0.1:9200/likecs_down_db/_search<br>REQUEST:<pre>Array
(
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                                        (
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        )

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)
</pre>RESPONSE:<pre>string(3048) "{"took":7,"timed_out":false,"_shards":{"total":1,"successful":1,"skipped":0,"failed":0},"hits":{"total":{"value":7401,"relation":"eq"},"max_score":28.756327,"hits":[{"_index":"likecs_down_db","_type":"_doc","_id":"71508","_score":28.756327,"_source":{"id":"71508","title":"SQLite Database\u5224\u65ad\u662f\u5426\u5b58\u5728\u3001\u65b0\u5efa\u3001\u5220\u9664 \u4e2d\u6587WORD\u7248","spidertime":"1623127138","contenttime":"1676277162","pageimage":"https:\/\/img.jbzj.com\/do\/uploads\/litimg\/161021\/091911596334.png","tag":"SQLite|Database|\u65b0\u5efa|\u5220\u9664","cate1":"\u7535\u5b50\u4e66\u7c4d","cate2":"\u6570\u636e\u5e93XML","cate3":"\u6570\u636e\u5e93\u5176\u5b83","attr1":"15.2KB"},"highlight":{"title":["SQLite Database#em#判#/em##em#断#/em##em#是#/em##em#否#/em#存在、新建、删除 #em#中#/em#文WORD版"]}},{"_index":"likecs_down_db","_type":"_doc","_id":"36484","_score":28.756327,"_source":{"id":"36484","title":"SQLite Database\u5224\u65ad\u662f\u5426\u5b58\u5728\u3001\u65b0\u5efa\u3001\u5220\u9664 \u4e2d\u6587WORD\u7248","spidertime":"1622961551","contenttime":"1672366486","pageimage":"https:\/\/img.jbzj.com\/do\/uploads\/litimg\/161021\/091911596334.png","tag":"SQLite|Database|\u65b0\u5efa|\u5220\u9664","cate1":"\u7535\u5b50\u4e66\u7c4d","cate2":"\u6570\u636e\u5e93XML","cate3":"\u6570\u636e\u5e93\u5176\u5b83","attr1":"15.2KB"},"highlight":{"title":["SQLite Database#em#判#/em##em#断#/em##em#是#/em##em#否#/em#存在、新建、删除 #em#中#/em#文WORD版"]}},{"_index":"likecs_down_db","_type":"_doc","_id":"70359","_score":21.985262,"_source":{"id":"70359","title":"JavaScript\u7684RegExp\u5bf9\u8c61 WORD\u7248","spidertime":"1623125605","contenttime":"1670272887","pageimage":"https:\/\/img.jbzj.com\/do\/uploads\/litimg\/170416\/095I059E54.png","tag":"javascript|RegExp|\u5bf9\u8c61","cate1":"\u7535\u5b50\u4e66\u7c4d","cate2":"javascript\u7535\u5b50\u4e66","attr1":"16.4KB"},"highlight":{"title":["#em#JavaScript#/em#的RegExp#em#对#/em##em#象#/em# WORD版"]}},{"_index":"likecs_down_db","_type":"_doc","_id":"35260","_score":21.985262,"_source":{"id":"35260","title":"JavaScript\u7684RegExp\u5bf9\u8c61 WORD\u7248","spidertime":"1622960124","contenttime":"1670604863","pageimage":"https:\/\/img.jbzj.com\/do\/uploads\/litimg\/170416\/095I059E54.png","tag":"javascript|RegExp|\u5bf9\u8c61","cate1":"\u7535\u5b50\u4e66\u7c4d","cate2":"javascript\u7535\u5b50\u4e66","attr1":"16.4KB"},"highlight":{"title":["#em#JavaScript#/em#的RegExp#em#对#/em##em#象#/em# WORD版"]}},{"_index":"likecs_down_db","_type":"_doc","_id":"70280","_score":21.688519,"_source":{"id":"70280","title":"CSS \u5c5e\u6027\u517c\u5bb9\u6027\u5bf9\u7167\u8868 PDF","spidertime":"1623125504","contenttime":"1670450215","pageimage":"https:\/\/img.jbzj.com\/do\/uploads\/userup\/0910\/2512125WN3.gif","tag":"css|\u517c\u5bb9\u6027\u5bf9\u7167\u8868","cate1":"\u7535\u5b50\u4e66\u7c4d","cate2":"CSS\u6559\u7a0b","attr1":"96KB"},"highlight":{"title":["CSS #em#属#/em##em#性#/em#兼容#em#性#/em##em#对#/em#照表 PDF"]}}]}}"
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                        <h1 class="page-title"><a href="/show-21563.html" title="JavaScript 判断对象中是否有某属性">JavaScript 判断对象中是否有某属性</a></h1>
            
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<p>　　判断对象中是否有某属性的常见方式总结，不同的场景要使用不同的方式。</p>
<h3>一、点( . )或者方括号( [ ] )</h3>
<p>　　通过点或者方括号可以获取对象的属性值，如果对象上不存在该属性，则会返回undefined。当然，这里的“不存在”指的是对象自身和原型链上都不存在，如果原型链有该属性，则会返回原型链上的属性值。</p>
<div class="likecs_code">
<pre><span style="color: #008000">//</span><span style="color: #008000"> 创建对象</span>
let test = {name : 'lei'<span style="color: #000000">}
</span><span style="color: #008000">//</span><span style="color: #008000"> 获取对象的自身的属性</span>
test.name            <span style="color: #008000">//</span><span style="color: #008000">"lei"</span>
test["name"]         <span style="color: #008000">//</span><span style="color: #008000">"lei"</span>

<span style="color: #008000">//</span><span style="color: #008000"> 获取不存在的属性</span>
test.age             <span style="color: #ff0000"><strong>//undefined</strong></span>

<span style="color: #008000">//</span><span style="color: #008000"> 获取原型上的属性</span>
test["toString"]     <span style="color: #008000">//</span><span style="color: #008000">toString() { [native code] }<br><br>// 新增一个值为undefined的属性<br>test.un = undefined<br><br>test.un              //undefined    不能用在属性值存在，但可能为 undefined的场景</span></pre>
</div>
<p>　　所以，我们可以根据 Obj.x !== undefined 的返回值 来判断Obj是否有x属性。</p>
<p>　　<span style="color: #ff0000">这种方式很简单方便，局限性就是：不能用在x的属性值存在，但可能为 undefined的场景。<span style="color: #000000"> in运算符可以解决这个问题</span></span></p>
<h3><span style="color: #000000">二、 in 运算符</span></h3>
<p><span style="color: #000000">　　<a href="https://developer.mozilla.org/zh-CN/docs/Web/JavaScript/Reference/Operators/in" target="_blank" rel="nofollow">MDN</a> 上对in运算符的介绍：</span><strong>如果指定的属性在指定的对象或其原型链中，则<code>in</code> 运算符返回<code>true</code>。</strong></p>
<div class="likecs_code">
<pre>'name' <span style="color: #0000ff">in</span> test        <span style="color: #008000">//</span><span style="color: #008000">true</span>
'un' <span style="color: #0000ff">in</span> test             <span style="color: #008000">//</span><span style="color: #008000">true</span>
'toString' <span style="color: #0000ff">in</span> test    <span style="color: #008000">//</span><span style="color: #008000">true</span>
'age' <span style="color: #0000ff">in</span> test           <span style="color: #008000">//</span><span style="color: #008000">false</span></pre>
</div>
<p>　　示例中可以看出，值为undefined的属性也可正常判断。</p>
<p>　　这种方式的局限性就是<span style="color: #ff0000">无法区分自身和原型链上的属性</span>，在只需要判断自身属性是否存在时，这种方式就不适用了。这时需要hasOwnProperty()</p>
<p> </p>
<h3>三、hasOwnProperty()</h3>
<div class="likecs_code">
<pre>test.hasOwnProperty('name')        <span style="color: #008000">//</span><span style="color: #008000">true   自身属性</span>
test.hasOwnProperty('age')           <span style="color: #008000">//</span><span style="color: #008000">false  不存在</span>
test.hasOwnProperty('toString')    <span style="color: #008000">//</span><span style="color: #008000">false  原型链上属性</span></pre>
</div>
<p>　　可以看到，只有自身存在该属性时，才会返回true。适用于<span style="color: #ff0000">只判断自身属性</span>的场景。</p>
<h3>总结</h3>
<p>　　三种方式各有优缺点，不同的场景使用不同的方式，有时还需要结合使用，比如遍历自身属性的时候，就会把 for ··· in  ···和 hasOwnProperty()结合使用。</p>
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