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This is a well-known browser security technique. In JavaScript, calling .toString() on a native browser function returns "function appendBuffer() { [native code] }". Calling it on a JavaScript function returns the actual source code. So if your appendBuffer has been monkey-patched, .toString() will betray you; it’ll return the attacker’s JavaScript source instead of the expected native code string.
，详情可参考safew官方下载
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The team from Pre-Construct Archaeology was working on a building site a few miles from Thetford, Norfolk, when they came across the hoard last year.
，详情可参考heLLoword翻译官方下载
虽然安抚的过程很艰难，但好歹是听进去了，然后顺利的到了幼儿园门口，可是第三天还是有很多小朋友在门口哭，她的情绪这次被带了起来，也开始哭，不过好在妈妈安慰的很好，她情绪来的快，去的也快，也顺利的走进了幼儿园。。关于这个话题，同城约会提供了深入分析
You repeatedly call sourceBuffer.appendBuffer(data) to push chunks of (in our case, pre-decrypted) encoded audio data to the browser.