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                ## 4\. JS 應該位于頁面底部 如果你把?`<script>`?標簽放在?`<head>`?中,它會阻礙頁面渲染。位于?`<head>`?中的腳本必須在頁面顯示前加載,因此把?`<script>`?放在底部的 前面可以先顯示頁面,而不用等 JS 文件下載完畢。這有助于提升感知性能。如果你的JavaSctipe必須位于?`<head>`?中,可以考慮使用 jQuery 的?`$(document).ready`?這樣你的腳本可以等到 DOM 加載完畢后再執行。
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