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最近公司有个项目里面有个功能需要在PC网页调用本地应用程序，之前经常见到这样的功能，比如有的网页会打开QQ，下载链接会打开迅雷。于是到网上开始搜索相关解决方案，发现搜索的结果不理想，都不是很完整的教程，这里记录一下自己的实践。
首先注册一个本地注册表文件，指向本地应用程序路径
创建一个注册表文件myprotocol.reg，内容如下所示。
Windows Registry Editor Version 5.00
[HKEY_CLASSES_ROOT\myprotocol]
@="myprotocol Protocol"
"URL Protocol"=""
[HKEY_CLASSES_ROOT\myprotocol\DefaultIcon]
@="F:\\soft\\Tencent\\QQ\\Bin\\QQScLauncher.exe"
[HKEY_CLASSES_ROOT\myprotocol\shell]
@=""
[HKEY_CLASSES_ROOT\myprotocol\shell\open]
@=""
[HKEY_CLASSES_ROOT\myprotocol\shell\open\command]
@="\"F:\\soft\\Tencent\\QQ\\Bin\\QQScLauncher.exe\" "
双击注册表文件myprotocol.reg，进行注册
选择“是”，之后选择确定
通过如下方式打开注册表信息
可以看到注册成功了。
其次在网页中用js指向这个注册表文件，就可以实现网页调用本地应用程序
创建QQ.html文件
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
</head>
<body style="text-align: center;padding-top: 300px;">
<button
οnclick="window.location.href='myprotocol://C:\\Users\\Administrator\\Desktop\\myprotocol.reg'"
style="margin: 200px auto;">打开QQ</button>
<a href="myprotocol://C:\Users\Administrator\Desktop\myprotocol.reg"
style="margin: 200px auto;">打开QQ</a>
</body>
</html>
双击用浏览器打开可以看到
点击打开QQ按钮，会弹出如下所示弹窗
可以看到我们打开了本地的QQ软件
至此我们通过js成功打开了本地的程序。
