cnpm i cors
var cors = require('cors')
router.use(cors())
express允许跨域
router.all('*', function (req, res, next) {
res.header('Access-Control-Allow-Origin', '*');
//Access-Control-Allow-Headers ,可根据浏览器的F12查看,把对应的粘贴在这里就行
res.header('Access-Control-Allow-Headers', 'Content-Type');
res.header('Access-Control-Allow-Methods', '*');
res.header('Content-Type', 'application/json;charset=utf-8');
next();
});
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