一、Bootstrap 引入报错
在使用bootstrap过程中发现无法使用下拉导航栏，或者是显示不出效果。
Failed to find a valid digest in the 'integrity' attribute for resource 'https://cdn.jsdelivr.net/npm/bootstrap@5.1.3/dist/css/bootstrap.min.css' with computed SHA-384 integrity
原因
<link href="https://cdn.jsdelivr.net/npm/bootstrap@5.1.3/dist/css/bootstrap.min.css" rel="stylesheet" integrity="sha384-rTTiRUKnSWaDu2FjhzWFl8/JuUZMlplyWE/djenb2LoKqkgLGfEGfSrL7XDLoB1M" crossorigin="anonymous">
<script src="https://cdn.jsdelivr.net/npm/bootstrap@5.1.3/dist/js/bootstrap.bundle.min.js" integrity="sha384-Nj1D6pu2WnJojj+67GiU9ZFNwbl7bUWX5Kj5MS22C8bGjllemM9pvQyvj14zJb58" crossorigin="anonymous">script>解决方案
删除 integrity="xxx..." crossorigin="anonymous"
<link href="https://cdn.jsdelivr.net/npm/bootstrap@5.1.3/dist/css/bootstrap.min.css" rel="stylesheet">
<script src="https://cdn.jsdelivr.net/npm/bootstrap@5.1.3/dist/js/bootstrap.bundle.min.js">script>
html>
<html lang="zh-CN">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<link href="https://cdn.jsdelivr.net/npm/bootstrap@5.1.3/dist/css/bootstrap.min.css" rel="stylesheet" integrity="sha384-rTTiRUKnSWaDu2FjhzWFl8/JuUZMlplyWE/djenb2LoKqkgLGfEGfSrL7XDLoB1M" crossorigin="anonymous">
<title>Hello, world!title>
head>
<body>
<h1>Hello, world!h1>
<script src="https://cdn.jsdelivr.net/npm/bootstrap@5.1.3/dist/js/bootstrap.bundle.min.js" integrity="sha384-Nj1D6pu2WnJojj+67GiU9ZFNwbl7bUWX5Kj5MS22C8bGjllemM9pvQyvj14zJb58" crossorigin="anonymous">script>
body>
html>