{"id":12073,"date":"2023-11-28T22:42:23","date_gmt":"2023-11-28T14:42:23","guid":{"rendered":"https:\/\/wx.kaifamiao.info\/?p=12073"},"modified":"2023-11-30T17:45:45","modified_gmt":"2023-11-30T09:45:45","slug":"javascript-zhong-shen-me-shi-zhi-xing-shang-xia-we","status":"publish","type":"post","link":"http:\/\/wx.kaifamiao.info\/index.php\/2023\/11\/28\/javascript-zhong-shen-me-shi-zhi-xing-shang-xia-we\/","title":{"rendered":"JavaScript \u4e2d\u4ec0\u4e48\u662f\u6267\u884c\u4e0a\u4e0b\u6587\u548c\u6267\u884c\u6808\uff1f"},"content":{"rendered":"<p>\u6267\u884c\u4e0a\u4e0b\u6587\uff08Execution Context\uff09\u548c\u6267\u884c\u6808\uff08Execution Stack\uff09\u662f JavaScript \u4e2d\u7528\u6765\u7ba1\u7406\u4ee3\u7801\u6267\u884c\u7684\u91cd\u8981\u6982\u5ff5\u3002<\/p>\n<h3><a id=\"%E6%89%A7%E8%A1%8C%E4%B8%8A%E4%B8%8B%E6%96%87%EF%BC%88execution-context%EF%BC%89%EF%BC%9A\" class=\"anchor\" aria-hidden=\"true\"><span class=\"octicon octicon-link\"><\/span><\/a>\u6267\u884c\u4e0a\u4e0b\u6587\uff08Execution Context\uff09\uff1a<\/h3>\n<p>\u6267\u884c\u4e0a\u4e0b\u6587\u662f JavaScript \u4e2d\u4ee3\u7801\u6267\u884c\u7684\u73af\u5883\u62bd\u8c61\uff0c\u5b83\u5b9a\u4e49\u4e86\u4ee3\u7801\u88ab\u6267\u884c\u65f6\u7684\u8fd0\u884c\u73af\u5883\u3002\u6bcf\u5f53 JavaScript \u4ee3\u7801\u88ab\u6267\u884c\u65f6\uff0c\u90fd\u4f1a\u521b\u5efa\u4e00\u4e2a\u6267\u884c\u4e0a\u4e0b\u6587\u3002<\/p>\n<p>\u6267\u884c\u4e0a\u4e0b\u6587\u5305\u542b\u4e86\u4e09\u79cd\u7c7b\u578b\uff1a<\/p>\n<ol>\n<li>\n<p><strong>\u5168\u5c40\u6267\u884c\u4e0a\u4e0b\u6587\uff08Global Execution Context\uff09<\/strong>\uff1a\u6574\u4e2a JavaScript \u4ee3\u7801\u7684\u9ed8\u8ba4\u6267\u884c\u4e0a\u4e0b\u6587\uff0c\u5b58\u5728\u4e8e\u4ee3\u7801\u6267\u884c\u5f00\u59cb\u65f6\uff0c\u53ea\u6709\u4e00\u4e2a\u5168\u5c40\u6267\u884c\u4e0a\u4e0b\u6587\u3002<\/p>\n<\/li>\n<li>\n<p><strong>\u51fd\u6570\u6267\u884c\u4e0a\u4e0b\u6587\uff08Function Execution Context\uff09<\/strong>\uff1a\u6bcf\u5f53\u51fd\u6570\u88ab\u8c03\u7528\u65f6\uff0c\u90fd\u4f1a\u521b\u5efa\u4e00\u4e2a\u51fd\u6570\u6267\u884c\u4e0a\u4e0b\u6587\u3002\u51fd\u6570\u6267\u884c\u4e0a\u4e0b\u6587\u4e0e\u8be5\u51fd\u6570\u76f8\u5173\u8054\uff0c\u5e76\u4e14\u53ef\u80fd\u4f1a\u6709\u591a\u4e2a\u51fd\u6570\u6267\u884c\u4e0a\u4e0b\u6587\u540c\u65f6\u5b58\u5728\uff08\u5f53\u9012\u5f52\u8c03\u7528\u51fd\u6570\u65f6\uff09\u3002<\/p>\n<\/li>\n<li>\n<p><strong>\u8bc4\u4f30\u548c\u6267\u884c\u4e0a\u4e0b\u6587\uff08Eval Execution Context\uff09<\/strong>\uff1a<code>eval()<\/code> \u51fd\u6570\u6267\u884c\u65f6\u4f1a\u521b\u5efa\u4e00\u4e2a\u6267\u884c\u4e0a\u4e0b\u6587\u3002<\/p>\n<\/li>\n<\/ol>\n<p>\u6bcf\u4e2a\u6267\u884c\u4e0a\u4e0b\u6587\u90fd\u5305\u542b\u4e86\uff1a<\/p>\n<ul>\n<li>\u53d8\u91cf\u5bf9\u8c61\uff08Variable Object\uff09\uff1a\u5305\u542b\u53d8\u91cf\u3001\u51fd\u6570\u58f0\u660e\u548c\u51fd\u6570\u53c2\u6570\u3002<\/li>\n<li>\u4f5c\u7528\u57df\u94fe\uff08Scope Chain\uff09\uff1a\u7528\u4e8e\u67e5\u627e\u53d8\u91cf\u7684\u94fe\u5f0f\u7ed3\u6784\uff0c\u4fdd\u8bc1\u5bf9\u53d8\u91cf\u7684\u6709\u6548\u8bbf\u95ee\u3002<\/li>\n<li>this \u6307\u5411\uff1a\u6307\u5411\u51fd\u6570\u6267\u884c\u65f6\u7684\u5f53\u524d\u5bf9\u8c61\u3002<\/li>\n<\/ul>\n<h3><a id=\"%E6%89%A7%E8%A1%8C%E6%A0%88%EF%BC%88execution-stack%EF%BC%89%EF%BC%9A\" class=\"anchor\" aria-hidden=\"true\"><span class=\"octicon octicon-link\"><\/span><\/a>\u6267\u884c\u6808\uff08Execution Stack\uff09\uff1a<\/h3>\n<p>\u6267\u884c\u6808\u662f\u7528\u6765\u5b58\u50a8\u6267\u884c\u4e0a\u4e0b\u6587\u7684\u4e00\u79cd\u6570\u636e\u7ed3\u6784\uff0c\u9075\u5faa\u5148\u8fdb\u540e\u51fa\uff08FILO\uff09\u7684\u539f\u5219\u3002\u5728 JavaScript \u4e2d\uff0c\u6267\u884c\u6808\u7528\u6765\u8ffd\u8e2a\u4ee3\u7801\u7684\u6267\u884c\u4f4d\u7f6e\u3002\u5f53\u4ee3\u7801\u88ab\u6267\u884c\u65f6\uff0c\u6267\u884c\u4e0a\u4e0b\u6587\u4f1a\u88ab\u538b\u5165\u6267\u884c\u6808\uff0c\u5f53\u6267\u884c\u7ed3\u675f\u540e\uff0c\u4f1a\u4ece\u6267\u884c\u6808\u4e2d\u5f39\u51fa\u3002<\/p>\n<p>\u6bcf\u5f53\u8c03\u7528\u4e00\u4e2a\u51fd\u6570\u65f6\uff0c\u4f1a\u521b\u5efa\u4e00\u4e2a\u65b0\u7684\u6267\u884c\u4e0a\u4e0b\u6587\uff0c\u5e76\u88ab\u63a8\u9001\u5230\u6267\u884c\u6808\u7684\u9876\u90e8\u3002\u5f53\u51fd\u6570\u6267\u884c\u5b8c\u6210\u540e\uff0c\u5176\u5bf9\u5e94\u7684\u6267\u884c\u4e0a\u4e0b\u6587\u4f1a\u88ab\u4ece\u6267\u884c\u6808\u4e2d\u5f39\u51fa\uff0c\u63a7\u5236\u6743\u4ea4\u56de\u7ed9\u524d\u4e00\u4e2a\u6267\u884c\u4e0a\u4e0b\u6587\u3002<\/p>\n<p>\u8fd9\u79cd\u6267\u884c\u4e0a\u4e0b\u6587\u7684\u5165\u6808\u548c\u51fa\u6808\u7684\u8fc7\u7a0b\u5f62\u6210\u4e86\u6267\u884c\u6808\u3002\u5982\u679c\u6267\u884c\u6808\u53d8\u5f97\u592a\u5927\uff08\u6bd4\u5982\u51fa\u73b0\u4e86\u8fc7\u591a\u7684\u5d4c\u5957\u51fd\u6570\u8c03\u7528\uff09\uff0c\u4f1a\u5bfc\u81f4\u6808\u6ea2\u51fa\uff08stack overflow\uff09\u9519\u8bef\u3002<\/p>\n<p>\u603b\u7ed3\u6765\u8bf4\uff0c\u6267\u884c\u4e0a\u4e0b\u6587\u662f\u63cf\u8ff0\u4ee3\u7801\u6267\u884c\u73af\u5883\u7684\u62bd\u8c61\u6982\u5ff5\uff0c\u800c\u6267\u884c\u6808\u662f\u7528\u6765\u7ba1\u7406\u6267\u884c\u4e0a\u4e0b\u6587\u7684\u6570\u636e\u7ed3\u6784\u3002JavaScript \u5f15\u64ce\u901a\u8fc7\u8fd9\u4e9b\u6982\u5ff5\u6765\u8ddf\u8e2a\u548c\u7ba1\u7406\u4ee3\u7801\u7684\u6267\u884c\u8fc7\u7a0b\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u6267\u884c\u4e0a\u4e0b\u6587\uff08Execution Context\uff09\u548c\u6267\u884c\u6808\uff08Execution Stack\uff09\u662f JavaScri [&hellip;]<\/p>\n","protected":false},"author":11,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[115],"tags":[],"class_list":["post-12073","post","type-post","status-publish","format-standard","hentry","category-javascript"],"_links":{"self":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/12073","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/users\/11"}],"replies":[{"embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/comments?post=12073"}],"version-history":[{"count":2,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/12073\/revisions"}],"predecessor-version":[{"id":13607,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/12073\/revisions\/13607"}],"wp:attachment":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/media?parent=12073"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/categories?post=12073"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/tags?post=12073"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}