有一个模块fs-lock，先npm install fs-lock一下
然后在js代码的头部设置限制路径，代码如下
//Do your startup code here, then lock it down with:
require('fs-lock')({
'file_accessdir': [ __dirname, '/tmp' ],
'open_basedir': [ '/usr/local/share/node_modules', __dirname ]
});
var fs = require('fs');
fs.readFile('/etc/passwd', function(err, data) {
//this will throw an Access Denied error
});
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