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var handle = function (req, res, stack) { var next = function (err) { if (err) { return handle500(err, req, res, stack); } // 从stack数组中取出中间件并执行 var middleware = stack.shift(); if (middleware) { // 传入next()函数自身,使中间件能够执行结束后递归 try { middleware(req, res, next); } catch (ex) { **// 这里的ex 与 next参数中的err不匹配** next(err); } } }; // 启动执行 next(); };
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