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                #### 瀏覽器解析 1.瀏覽器解析html的時候,是從上往上執行的 2.解析到DOm的 scirpt時,先解析script標簽里的內容,造成dom的構建阻塞 3.script腳本加載完畢后,才會繼續往下執行 #### async和defer區別 async和defer會實現script標簽異步加載,在瀏覽器解析html的同時,解析script腳本 區別在于: 1. async標簽內的腳本解析完畢后會立即執行script,如果dom解析沒結束會暫停,等待js執行完畢后繼續解析,所以有可能造成html阻塞 3. defer中的腳本加載完畢后,會繼續等待dom解析,等待html解析完畢之后再執行js,不會造成html阻塞
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