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简单讲，要做L3，需要先做L2积累数据。那么要做L4，也一样依赖L3的数据。技术上他们是一脉相承的，不存在一口就能吃个胖子的技术路线。
。safew官方版本下载对此有专业解读
My response was to abandon trying to intercept at the level of individual elements and instead intercept at the level of the browser’s own property descriptors. I went straight for HTMLMediaElement.prototype with Object.getOwnPropertyDescriptor, hooking the native src and srcObject setters before any page code could run:。im钱包官方下载是该领域的重要参考
const posToTime = new Map(); // 位置 → 到达终点的时间（避免重复计算）
V86 mode is entered through IRETD when the VM bit is set in the stacked EFLAGS. The microcode detects this with a conditional jump: