If we could simply rewind time and watch the code execute exactly as it did for those failed requests, life would be a lot easier.
Also note the use of _call.call(_toString, original) rather than simply original.toString(). This is because original.toString might itself be hooked by the time spoof is called. By holding cached references to Function.prototype.call and Function.prototype.toString at the very beginning of the script (before any page code runs), and invoking them via those cached references, the spoof function is immune to any tampering that might have happened in the interim. It’s eating its own tail in the most delightful way.
，更多细节参见夫子
"Enchanted" by Taylor Swift (Episode 2)
多家供应链与渠道人士确认，智能手机存储芯片采购成本较去年同期已上涨超过 80%，且涨势仍未见放缓迹象。