{"id":52759,"date":"2024-12-03T13:34:08","date_gmt":"2024-12-03T05:34:08","guid":{"rendered":"https:\/\/fwq.ai\/blog\/52759\/"},"modified":"2024-12-03T13:34:08","modified_gmt":"2024-12-03T05:34:08","slug":"javascript-%e4%b8%ad-window-%e5%af%b9%e8%b1%a1%e7%9a%84%e7%a5%9e%e5%a5%87%e5%8f%96%e5%80%bc%ef%bc%9a%e4%b8%ba%e4%bb%80%e4%b9%88%e5%8f%af%e4%bb%a5%e8%ae%bf%e9%97%ae%e4%b8%8d%e5%ad%98%e5%9c%a8%e7%9a%84","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/52759\/","title":{"rendered":"JavaScript \u4e2d window \u5bf9\u8c61\u7684\u795e\u5947\u53d6\u503c\uff1a\u4e3a\u4ec0\u4e48\u53ef\u4ee5\u8bbf\u95ee\u4e0d\u5b58\u5728\u7684\u5c5e\u6027\uff1f"},"content":{"rendered":"

<\/b> <\/p>\n

JavaScript \u4e2d window \u5bf9\u8c61\u7684\u795e\u5947\u53d6\u503c\uff1a\u4e3a\u4ec0\u4e48\u53ef\u4ee5\u8bbf\u95ee\u4e0d\u5b58\u5728\u7684\u5c5e\u6027\uff1f<\/h1>\n

\u5927\u5bb6\u597d\uff0c\u6211\u4eec\u53c8\u89c1\u9762\u4e86\u554a~\u672c\u6587\u300aJavaScript \u4e2d window \u5bf9\u8c61\u7684\u795e\u5947\u53d6\u503c\uff1a\u4e3a\u4ec0\u4e48\u53ef\u4ee5\u8bbf\u95ee\u4e0d\u5b58\u5728\u7684\u5c5e\u6027\uff1f\u300b<\/span>\u7684\u5185\u5bb9\u4e2d\u5c06\u4f1a\u6d89\u53ca\u5230<\/span>\u7b49\u7b49\u3002\u5982\u679c\u4f60\u6b63\u5728\u5b66\u4e60\u6587\u7ae0<\/span>\u76f8\u5173\u77e5\u8bc6\uff0c\u6b22\u8fce\u5173\u6ce8\u6211\uff0c\u4ee5\u540e\u4f1a\u7ed9\u5927\u5bb6\u5e26\u6765\u66f4\u591a\u6587\u7ae0<\/span>\u76f8\u5173\u6587\u7ae0\uff0c\u5e0c\u671b\u6211\u4eec\u80fd\u4e00\u8d77\u8fdb\u6b65\uff01\u4e0b\u9762\u5c31\u5f00\u59cb\u672c\u6587\u7684\u6b63\u5f0f\u5185\u5bb9~<\/p>\n

\"JavaScript<\/p>\n

window \u5bf9\u8c61\u4e2d\u7684\u795e\u5947\u53d6\u503c<\/strong><\/p>\n

\u5728 javascript \u4e2d\uff0c\u6211\u4eec\u7ecf\u5e38\u4f7f\u7528 window \u5bf9\u8c61\u6765\u83b7\u53d6\u6d4f\u89c8\u5668\u76f8\u5173\u4fe1\u606f\u3002\u4f46\u4f60\u77e5\u9053\u5417\uff1fwindow \u5bf9\u8c61\u53ef\u4ee5\u53d6\u503c\u4efb\u610f\u4e00\u4e2a\u540d\u79f0\uff0c\u5373\u4f7f\u8fd9\u4e2a\u540d\u79f0\u4e0d\u5b58\u5728\uff01<\/p>\n

\u95ee\u9898\u573a\u666f<\/strong><\/p>\n

\u4ee5\u4e0b\u4ee3\u7801\u6f14\u793a\u4e86\u8fd9\u79cd\u7279\u6027\uff1a<\/p>\n

console.log(window.num); \/\/ undefined\nconsole.log(num); \/\/ Uncaught ReferenceError: num is not defined<\/pre>\n
\u6267\u884c\u539f\u7406<\/strong><\/p>\n
\u4e3a\u4ec0\u4e48\u53ef\u4ee5\u76f4\u63a5\u4f7f\u7528 window \u5bf9\u8c61\u53d6\u503c\u4e0d\u5b58\u5728\u7684\u5c5e\u6027 num\uff1f\u539f\u6765\uff0c\u8fd9\u79cd\u7279\u6027\u662f\u4e00\u79cd\u8bed\u8a00\u7279\u6027\uff0c\u7c7b\u4f3c\u4e8e\u4e3a\u6570\u7ec4\u8d4b\u503c\u4e0d\u5b58\u5728\u7684\u4e0b\u6807\u65f6\u81ea\u52a8\u6269\u5bb9\u3002<\/p>\n
\u70b9\u8bed\u6cd5\u662f\u901a\u8fc7 [[getownproperty]] \u53d6\u503c\u7684\u3002\u5728 ecmascript \u89c4\u8303\u4e2d\uff0c\u5bf9\u8fd9\u79cd\u884c\u4e3a\u6709\u76f8\u5173\u7684\u63cf\u8ff0\uff1a<\/p>\n
\u5f53\u4f7f\u7528\u70b9\u8bed\u6cd5\u83b7\u53d6\u5bf9\u8c61\u5c5e\u6027\u65f6\uff0c\u5982\u679c\u8be5\u5c5e\u6027\u4e0d\u5b58\u5728\uff0c\u5b83\u4f1a\u89e6\u53d1\u4e00\u4e2a\u5185\u90e8\u7684\u4ee3\u7406\u9677\u9631\u3002\u8fd9\u4e2a\u9677\u9631\u7684\u4f5c\u7528\u662f\uff0c\u68c0\u67e5\u8be5\u5c5e\u6027\u662f\u5426\u5728\u5bf9\u8c61\u7684\u539f\u578b\u94fe\u4e2d\u5b58\u5728\u3002\u5982\u679c\u5728\u539f\u578b\u94fe\u4e2d\u5b58\u5728\uff0c\u5219\u8fd4\u56de\u8be5\u5c5e\u6027\u7684\u503c\uff1b\u5426\u5219\uff0c\u8fd4\u56de undefined\u3002<\/p>\n
\u6269\u5c55\u8bf4\u660e<\/strong><\/p>\n
\u8fd9\u79cd\u7279\u6027\u53ef\u4ee5\u4f7f\u5f97\u4ee3\u7801\u66f4\u7b80\u6d01\u4f18\u96c5\uff0c\u4f46\u9700\u8981\u6ce8\u610f\u4e0d\u8981\u6ee5\u7528\uff0c\u4ee5\u514d\u9020\u6210\u4ee3\u7801\u903b\u8f91\u6df7\u4e71\u3002\u5728\u67d0\u4e9b\u60c5\u51b5\u4e0b\uff0c\u8fd8\u662f\u5efa\u8bae\u660e\u786e\u4f7f\u7528 window \u5bf9\u8c61\u6765\u8bbf\u95ee\u5168\u5c40\u53d8\u91cf\u3002<\/p>\n
\u6587\u4e2d\u5173\u4e8e\u7684\u77e5\u8bc6\u4ecb\u7ecd\uff0c\u5e0c\u671b\u5bf9\u4f60\u7684\u5b66\u4e60\u6709\u6240\u5e2e\u52a9\uff01\u82e5\u662f\u53d7\u76ca\u532a\u6d45\uff0c\u90a3\u5c31\u52a8\u52a8\u9f20\u6807\u6536\u85cf\u8fd9\u7bc7\u300aJavaScript \u4e2d window \u5bf9\u8c61\u7684\u795e\u5947\u53d6\u503c\uff1a\u4e3a\u4ec0\u4e48\u53ef\u4ee5\u8bbf\u95ee\u4e0d\u5b58\u5728\u7684\u5c5e\u6027\uff1f\u300b\u6587\u7ae0\u5427\uff0c\u4e5f\u53ef\u5173\u6ce8\u7c73\u4e91\u516c\u4f17\u53f7\u4e86\u89e3\u76f8\u5173\u6280\u672f\u6587\u7ae0\u3002<\/p>\n
\n
<\/dt>\n
\n   win10\u600e\u4e48\u5f00\u542f\u8f93\u5165\u6cd5\u517c\u5bb9\u6a21\u5f0f win10\u8f93\u5165\u6cd5\u517c\u5bb9\u6a21\u5f0f\u5f00\u542f\u65b9\u6cd5\n <\/dd>\n<\/dl>\n","protected":false},"excerpt":{"rendered":"
JavaScript \u4e2d window \u5bf9\u8c61\u7684\u795e\u5947\u53d6\u503c\uff1a\u4e3a\u4ec0\u4e48\u53ef\u4ee5\u8bbf\u95ee\u4e0d\u5b58\u5728\u7684\u5c5e\u6027\uff1f \u5927\u5bb6\u597d\uff0c\u6211\u4eec\u53c8\u89c1\u9762\u4e86\u554a~\u672c\u6587\u300aJavaScript \u4e2d window \u5bf9\u8c61\u7684\u795e\u5947\u53d6\u503c\uff1a\u4e3a\u4ec0\u4e48\u53ef\u4ee5\u8bbf\u95ee\u4e0d\u5b58\u5728\u7684\u5c5e\u6027\uff1f\u300b\u7684\u5185\u5bb9\u4e2d\u5c06\u4f1a\u6d89\u53ca\u5230\u7b49\u7b49\u3002\u5982\u679c\u4f60\u6b63\u5728\u5b66\u4e60\u6587\u7ae0\u76f8\u5173\u77e5\u8bc6\uff0c\u6b22\u8fce\u5173\u6ce8\u6211\uff0c\u4ee5\u540e\u4f1a\u7ed9\u5927\u5bb6\u5e26\u6765\u66f4\u591a\u6587\u7ae0\u76f8\u5173\u6587\u7ae0\uff0c\u5e0c\u671b\u6211\u4eec\u80fd\u4e00\u8d77\u8fdb\u6b65\uff01\u4e0b\u9762\u5c31\u5f00\u59cb\u672c\u6587\u7684\u6b63\u5f0f\u5185\u5bb9~ window \u5bf9\u8c61\u4e2d\u7684\u795e\u5947\u53d6\u503c \u5728 javascript \u4e2d\uff0c\u6211\u4eec\u7ecf\u5e38\u4f7f\u7528 window \u5bf9\u8c61\u6765\u83b7\u53d6\u6d4f\u89c8\u5668\u76f8\u5173\u4fe1\u606f\u3002\u4f46\u4f60\u77e5\u9053\u5417\uff1fwindow \u5bf9\u8c61\u53ef\u4ee5\u53d6\u503c\u4efb\u610f\u4e00\u4e2a\u540d\u79f0\uff0c\u5373\u4f7f\u8fd9\u4e2a\u540d\u79f0\u4e0d\u5b58\u5728\uff01 \u95ee\u9898\u573a\u666f \u4ee5\u4e0b\u4ee3\u7801\u6f14\u793a\u4e86\u8fd9\u79cd\u7279\u6027\uff1a console.log(window.num); \/\/ undefined console.log(num); \/\/ Uncaught ReferenceError: num is not defined \u6267\u884c\u539f\u7406 \u4e3a\u4ec0\u4e48\u53ef\u4ee5\u76f4\u63a5\u4f7f\u7528 window \u5bf9\u8c61\u53d6\u503c\u4e0d\u5b58\u5728\u7684\u5c5e\u6027 num\uff1f\u539f\u6765\uff0c\u8fd9\u79cd\u7279\u6027\u662f\u4e00\u79cd\u8bed\u8a00\u7279\u6027\uff0c\u7c7b\u4f3c\u4e8e\u4e3a\u6570\u7ec4\u8d4b\u503c\u4e0d\u5b58\u5728\u7684\u4e0b\u6807\u65f6\u81ea\u52a8\u6269\u5bb9\u3002 \u70b9\u8bed\u6cd5\u662f\u901a\u8fc7 [[getownproperty]] \u53d6\u503c\u7684\u3002\u5728 ecmascript \u89c4\u8303\u4e2d\uff0c\u5bf9\u8fd9\u79cd\u884c\u4e3a\u6709\u76f8\u5173\u7684\u63cf\u8ff0\uff1a \u5f53\u4f7f\u7528\u70b9\u8bed\u6cd5\u83b7\u53d6\u5bf9\u8c61\u5c5e\u6027\u65f6\uff0c\u5982\u679c\u8be5\u5c5e\u6027\u4e0d\u5b58\u5728\uff0c\u5b83\u4f1a\u89e6\u53d1\u4e00\u4e2a\u5185\u90e8\u7684\u4ee3\u7406\u9677\u9631\u3002\u8fd9\u4e2a\u9677\u9631\u7684\u4f5c\u7528\u662f\uff0c\u68c0\u67e5\u8be5\u5c5e\u6027\u662f\u5426\u5728\u5bf9\u8c61\u7684\u539f\u578b\u94fe\u4e2d\u5b58\u5728\u3002\u5982\u679c\u5728\u539f\u578b\u94fe\u4e2d\u5b58\u5728\uff0c\u5219\u8fd4\u56de\u8be5\u5c5e\u6027\u7684\u503c\uff1b\u5426\u5219\uff0c\u8fd4\u56de undefined\u3002 \u6269\u5c55\u8bf4\u660e \u8fd9\u79cd\u7279\u6027\u53ef\u4ee5\u4f7f\u5f97\u4ee3\u7801\u66f4\u7b80\u6d01\u4f18\u96c5\uff0c\u4f46\u9700\u8981\u6ce8\u610f\u4e0d\u8981\u6ee5\u7528\uff0c\u4ee5\u514d\u9020\u6210\u4ee3\u7801\u903b\u8f91\u6df7\u4e71\u3002\u5728\u67d0\u4e9b\u60c5\u51b5\u4e0b\uff0c\u8fd8\u662f\u5efa\u8bae\u660e\u786e\u4f7f\u7528 window \u5bf9\u8c61\u6765\u8bbf\u95ee\u5168\u5c40\u53d8\u91cf\u3002 \u6587\u4e2d\u5173\u4e8e\u7684\u77e5\u8bc6\u4ecb\u7ecd\uff0c\u5e0c\u671b\u5bf9\u4f60\u7684\u5b66\u4e60\u6709\u6240\u5e2e\u52a9\uff01\u82e5\u662f\u53d7\u76ca\u532a\u6d45\uff0c\u90a3\u5c31\u52a8\u52a8\u9f20\u6807\u6536\u85cf\u8fd9\u7bc7\u300aJavaScript \u4e2d window \u5bf9\u8c61\u7684\u795e\u5947\u53d6\u503c\uff1a\u4e3a\u4ec0\u4e48\u53ef\u4ee5\u8bbf\u95ee\u4e0d\u5b58\u5728\u7684\u5c5e\u6027\uff1f\u300b\u6587\u7ae0\u5427\uff0c\u4e5f\u53ef\u5173\u6ce8\u7c73\u4e91\u516c\u4f17\u53f7\u4e86\u89e3\u76f8\u5173\u6280\u672f\u6587\u7ae0\u3002 win10\u600e\u4e48\u5f00\u542f\u8f93\u5165\u6cd5\u517c\u5bb9\u6a21\u5f0f win10\u8f93\u5165\u6cd5\u517c\u5bb9\u6a21\u5f0f\u5f00\u542f\u65b9\u6cd5<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[16],"tags":[],"class_list":["post-52759","post","type-post","status-publish","format-standard","hentry","category-16"],"_links":{"self":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/52759","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/comments?post=52759"}],"version-history":[{"count":0,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/52759\/revisions"}],"wp:attachment":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/media?parent=52759"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/categories?post=52759"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/tags?post=52759"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}