{"id":978,"date":"2025-12-27T11:14:38","date_gmt":"2025-12-27T03:14:38","guid":{"rendered":"https:\/\/www.52runoob.com\/?p=978"},"modified":"2025-12-27T11:14:38","modified_gmt":"2025-12-27T03:14:38","slug":"js-indexof","status":"publish","type":"post","link":"https:\/\/www.52runoob.com\/index.php\/2025\/12\/27\/js-indexof\/","title":{"rendered":"js indexof"},"content":{"rendered":"\n<p>TCP \u4e09\u6b21\u63e1\u624b\uff08Three-Way Handshake\uff09\u662f <strong>TCP \u5efa\u7acb\u53ef\u9760\u8fde\u63a5<\/strong> \u7684\u6807\u51c6\u8fc7\u7a0b\uff0c\u76ee\u7684\u662f\u786e\u8ba4\u53cc\u65b9\u7684 <strong>\u6536\u53d1\u80fd\u529b<\/strong> \u5e76 <strong>\u540c\u6b65\u5e8f\u5217\u53f7<\/strong>\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u4e00\u3001\u4e3a\u4ec0\u4e48\u8981\u4e09\u6b21\uff1f<\/h2>\n\n\n\n<p>\u6838\u5fc3\u76ee\u7684\u53ea\u6709\u4e09\u70b9\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u786e\u8ba4\u5ba2\u6237\u7aef\u80fd\u53d1\u3001\u670d\u52a1\u5668\u80fd\u6536<\/strong><\/li>\n\n\n\n<li><strong>\u786e\u8ba4\u670d\u52a1\u5668\u80fd\u53d1\u3001\u5ba2\u6237\u7aef\u80fd\u6536<\/strong><\/li>\n\n\n\n<li><strong>\u540c\u6b65\u53cc\u65b9\u7684\u521d\u59cb\u5e8f\u5217\u53f7\uff08ISN\uff09<\/strong><\/li>\n<\/ol>\n\n\n\n<p>\u5c11\u4e00\u6b21\u4e0d\u5b89\u5168\uff0c\u591a\u4e00\u6b21\u6ca1\u5fc5\u8981\uff0c\u56e0\u6b64\u662f <strong>\u4e09\u6b21<\/strong>\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u4e8c\u3001\u4e09\u6b21\u63e1\u624b\u5168\u8fc7\u7a0b<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">\u7b2c\u4e00\u6b21\uff1a\u5ba2\u6237\u7aef \u2192 \u670d\u52a1\u5668\uff08SYN\uff09<\/h3>\n\n\n\n<p>\u5ba2\u6237\u7aef\u8bf7\u6c42\u5efa\u7acb\u8fde\u63a5\u3002<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u6807\u5fd7\u4f4d\uff1a<code>SYN = 1<\/code><\/li>\n\n\n\n<li>\u521d\u59cb\u5e8f\u5217\u53f7\uff1a<code>Seq = x<\/code>\uff08\u968f\u673a\u751f\u6210\uff09<\/li>\n<\/ul>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: plain; title: ; notranslate\" title=\"\">\nClient \u2192 Server\nSYN = 1, Seq = x\n\n<\/pre><\/div>\n\n\n<p>\ud83d\udc49 \u8868\u793a\uff1a<strong>\u6211\u60f3\u8ddf\u4f60\u5efa\u7acb\u8fde\u63a5<\/strong><\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">\u7b2c\u4e8c\u6b21\uff1a\u670d\u52a1\u5668 \u2192 \u5ba2\u6237\u7aef\uff08SYN + ACK\uff09<\/h3>\n\n\n\n<p>\u670d\u52a1\u5668\u540c\u610f\u8fde\u63a5\uff0c\u5e76\u786e\u8ba4\u5ba2\u6237\u7aef\u7684\u8bf7\u6c42\u3002<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u6807\u5fd7\u4f4d\uff1a<code>SYN = 1<\/code>, <code>ACK = 1<\/code><\/li>\n\n\n\n<li>\u670d\u52a1\u5668\u5e8f\u5217\u53f7\uff1a<code>Seq = y<\/code><\/li>\n\n\n\n<li>\u786e\u8ba4\u53f7\uff1a<code>Ack = x + 1<\/code><\/li>\n<\/ul>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: plain; title: ; notranslate\" title=\"\">\nServer \u2192 Client\nSYN = 1, ACK = 1\nSeq = y, Ack = x + 1\n\n<\/pre><\/div>\n\n\n<p>\ud83d\udc49 \u8868\u793a\uff1a<strong>\u6211\u6536\u5230\u4e86\u4f60\u7684\u8bf7\u6c42\uff0c\u6211\u4e5f\u51c6\u5907\u597d\u4e86<\/strong><\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">\u7b2c\u4e09\u6b21\uff1a\u5ba2\u6237\u7aef \u2192 \u670d\u52a1\u5668\uff08ACK\uff09<\/h3>\n\n\n\n<p>\u5ba2\u6237\u7aef\u786e\u8ba4\u670d\u52a1\u5668\u7684\u54cd\u5e94\u3002<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u6807\u5fd7\u4f4d\uff1a<code>ACK = 1<\/code><\/li>\n\n\n\n<li>\u786e\u8ba4\u53f7\uff1a<code>Ack = y + 1<\/code><\/li>\n<\/ul>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: plain; title: ; notranslate\" title=\"\">\nClient \u2192 Server\nACK = 1, Ack = y + 1\n\n<\/pre><\/div>\n\n\n<p>\ud83d\udc49 \u8868\u793a\uff1a<strong>\u6211\u786e\u8ba4\u6536\u5230\u4f60\u7684\u54cd\u5e94\uff0c\u53ef\u4ee5\u5f00\u59cb\u901a\u4fe1\u4e86<\/strong><\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u4e09\u3001\u72b6\u6001\u53d8\u5316\uff08\u975e\u5e38\u5e38\u8003\uff09<\/h2>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>\u89d2\u8272<\/th><th>\u72b6\u6001\u53d8\u5316<\/th><\/tr><\/thead><tbody><tr><td>\u5ba2\u6237\u7aef<\/td><td><code>CLOSED \u2192 SYN_SENT \u2192 ESTABLISHED<\/code><\/td><\/tr><tr><td>\u670d\u52a1\u5668<\/td><td><code>CLOSED \u2192 LISTEN \u2192 SYN_RCVD \u2192 ESTABLISHED<\/code><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u56db\u3001\u4e3a\u4ec0\u4e48\u4e0d\u80fd\u4e24\u6b21\uff1f<\/h2>\n\n\n\n<p>\u5982\u679c\u53ea\u6709\u4e24\u6b21\u63e1\u624b\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u670d\u52a1\u5668\u65e0\u6cd5\u786e\u8ba4 <strong>\u5ba2\u6237\u7aef\u662f\u5426\u6536\u5230\u4e86\u81ea\u5df1\u7684 SYN<\/strong><\/li>\n\n\n\n<li>\u5bb9\u6613\u9020\u6210 <strong>\u5386\u53f2\u8fde\u63a5\u8bf7\u6c42\u88ab\u8bef\u8ba4\u4e3a\u6709\u6548\u8fde\u63a5<\/strong><\/li>\n\n\n\n<li>\u53ef\u80fd\u5f15\u53d1 <strong>\u8d44\u6e90\u6d6a\u8d39\u6216\u8fde\u63a5\u9519\u4e71<\/strong><\/li>\n<\/ul>\n\n\n\n<p>\u4e09\u6b21\u63e1\u624b\u6b63\u597d\u89e3\u51b3\u4e86\u8fd9\u4e9b\u95ee\u9898\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u4e94\u3001\u53e3\u8bc0\u8bb0\u5fc6\u7248<\/h2>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p><strong>SYN \u8bf7\u6c42 \u2192 SYN+ACK \u5e94\u7b54 \u2192 ACK \u786e\u8ba4<\/strong><\/p>\n<\/blockquote>\n\n\n\n<p>\u6216\u8005\u4e00\u53e5\u8bdd\uff1a<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p><strong>\u4f60\u627e\u6211\uff1f\u6211\u7b54\u5e94\u4f60\u3002\u597d\uff0c\u5f00\u59cb\u5427\u3002<\/strong><\/p>\n<\/blockquote>\n","protected":false},"excerpt":{"rendered":"<p>TCP \u4e09\u6b21\u63e1\u624b\uff08Three-Way Handshake\uff09\u662f TCP \u5efa\u7acb\u53ef\u9760\u8fde&#8230; <a class=\"more-link\" href=\"https:\/\/www.52runoob.com\/index.php\/2025\/12\/27\/js-indexof\/\">Continue Reading &rarr;<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[12],"tags":[],"class_list":["post-978","post","type-post","status-publish","format-standard","hentry","category-12"],"amp_enabled":true,"_links":{"self":[{"href":"https:\/\/www.52runoob.com\/index.php\/wp-json\/wp\/v2\/posts\/978","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.52runoob.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.52runoob.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.52runoob.com\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.52runoob.com\/index.php\/wp-json\/wp\/v2\/comments?post=978"}],"version-history":[{"count":1,"href":"https:\/\/www.52runoob.com\/index.php\/wp-json\/wp\/v2\/posts\/978\/revisions"}],"predecessor-version":[{"id":979,"href":"https:\/\/www.52runoob.com\/index.php\/wp-json\/wp\/v2\/posts\/978\/revisions\/979"}],"wp:attachment":[{"href":"https:\/\/www.52runoob.com\/index.php\/wp-json\/wp\/v2\/media?parent=978"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.52runoob.com\/index.php\/wp-json\/wp\/v2\/categories?post=978"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.52runoob.com\/index.php\/wp-json\/wp\/v2\/tags?post=978"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}