to_be_deleted[classno] = j;
Barycentric Coordinates
，更多细节参见同城约会
在故乡县城，你还是能找到许多过去的影子。那是“中式梦核”遗留在时代缝隙里的影子：破旧的房子很多年没有修，没办法在大城市出现的电动三轮成为县城独特的出行工具，小摊的烟火气在无序中自有章法……
3 transform chain
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.