使用浏览器的文件api实现，完整代码如下：
<!DOCTYPE html>
<html>
<head>
<script src="//repo.bfw.wiki/bfwrepo/js/eruda.js"></script>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width,initial-scale=1.0,maximum=1.0,minimum=1.0,user-scalable=0" />
<title>BFW NEW PAGE</title>
<link type="text/css" rel="stylesheet" href="//repo.bfw.wiki/bfwrepo/css/bootstrap.4.3.1.min.css">
<style>
body{
padding: 10px;
}
</style>
</head>
<body>
<p><button id="openlocalfile">打开本地文件</button>
<button id="savetolocalfile">保存到本地</button>不要在iframe中打开</p>
<textarea id="editor" style="width:100%;height:400px;"></textarea>
<script>
const openbtn = document.getElementById('openlocalfile');
const editor = document.getElementById('editor');
const savebtn = document.getElementById('savetolocalfile');
let fileHandle;
openbtn.addEventListener('click', async () => {
[fileHandle] = await window.showOpenFilePicker();
const file = await fileHandle.getFile();
const contents = await file.text();
editor.value = contents;
});
savebtn.addEventListener('click', async () => {
if(fileHandle==null){
alert("请先打开一个本地文件后进行修改");
return;
}
const writable = await fileHandle.createWritable();
// Write the contents of the file to the stream.
await writable.write(editor.value);
// Close the file and write the contents to disk.
await writable.close();
alert("修改本地文件成功");
});
</script>
</body>
</html>
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