Snapshotting is a feature worth noting. You can capture a running VM’s state including CPU registers, memory, and devices, and restore it later. This enables warm pools where you boot a VM once, install dependencies, snapshot it, and restore clones in milliseconds instead of booting fresh each time. This is how some platforms achieve incredibly fast cold starts even with full VM isolation.
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.，推荐阅读同城约会获取更多信息
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Bill Harwood has been covering the U.S. space program full-time since 1984, first as Cape Canaveral bureau chief for United Press International and now as a consultant for CBS News.