blocked by CORS policy: Request header field token is not allowed by Access-Control-Allow-Headers in

uniapp 跨域报错:

blocked by CORS policy: Request header field token is not allowed by A***ess-Control-Allow-Headers in preflight response

原因跨域设置没有设置token名称,将token加入请求跨域请求头里面即可

没设置token前

//设置跨域访问（设置在所有的请求前面即可）
router.all("*", function (req, res, next) {
	//设置允许跨域的域名，*代表允许任意域名跨域
	res.header("A***ess-Control-Allow-Origin", "*");
	//允许的header类型,X-Requested-With
	res.header("A***ess-Control-Allow-Headers", "Content-Type");
    //跨域允许的请求方式 
	res.header("A***ess-Control-Allow-Methods", "DELETE,PUT,POST,GET,OPTIONS");
	// res.header("A***ess-Control-Allow-Methods", "*");
	res.header("Content-Type", "application/json;chartset=utf-8");
	// if (req.method == 'OPTIONS')
	// 	res.sendStatus(200); //让options尝试请求快速结束
	// else
		next();
});

设置token后

//设置跨域访问（设置在所有的请求前面即可）
router.all("*", function (req, res, next) {
	//设置允许跨域的域名，*代表允许任意域名跨域
	res.header("A***ess-Control-Allow-Origin", "*");
	//允许的header类型,X-Requested-With
	res.header("A***ess-Control-Allow-Headers", "Appid,Secret,A***ess-Token,token,Content-Type,Origin,User-Agent,DNT,Cache-Control,X-Requested-With");
    //跨域允许的请求方式 
	res.header("A***ess-Control-Allow-Methods", "DELETE,PUT,POST,GET,OPTIONS");
	// res.header("A***ess-Control-Allow-Methods", "*");
	res.header("Content-Type", "application/json;chartset=utf-8");
	// if (req.method == 'OPTIONS')
	// 	res.sendStatus(200); //让options尝试请求快速结束
	// else
		next();
});

对比差异

"A***ess-Control-Allow-Headers", "Content-Type,token"

加上token即可解决,同理要是需要其他请求头以逗号分隔加上即可