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.
借助光栅原理，让屏幕发出的光只能从正面特定角度范围内看到，从而实现「大角度防窥」的效果：
，这一点在搜狗输入法下载中也有详细论述
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