// 设置允许跨域访问该服务
app.all('*', function (req, res, next) {
res.header('Access-Control-Allow-Origin', '*');
res.header('Access-Control-Allow-Methods', 'PUT, GET, POST, DELETE, OPTIONS');
res.header('Access-Control-Allow-Headers', 'X-Requested-With');
res.header('Access-Control-Allow-Headers', 'Content-Type');
next();
});
node.js exercises (set to allow cross-domain access to services)
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Origin blog.csdn.net/weixin_46611729/article/details/110038349
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