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阿七
``` javascript Promise.prototype.then = function(onResolved, onRejected) { ... if (self.state === 'resolved') { return new Promise(function(resolve, reject) { try { var x = onResolved(self.data); // 如果onResolved的返回值是一个Promise对象，直接取它的结果做为promise2的结果 if (x instanceof Promise)...