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从输入页面URL到页面渲染完成大致流程 #45

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janeLLLL opened this issue Jan 6, 2021 · 0 comments

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janeLLLL commented Jan 6, 2021

解析URL
浏览器本地缓存
DNS解析
建立TCP/IP连接
发送HTTP请求
服务器处理请求并返回HTTP报文
浏览器根据深度遍历的方式把html节点遍历构建DOM树
遇到CSS外链，异步加载解析CSS，构建CSS规则树
遇到script标签，如果是普通JS标签则同步加载并执行，阻塞页面渲染，如果标签上有defer / async属性则异步加载JS资源
将dom树和CSS DOM树构造成render树
渲染render树

janeLLLL added the 面试记录 label

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