// 易错点2：判断条件必须是<=，而非<（相等元素也无法作为「更大值」，需弹出）
With a thousand points, you barely notice the delay. With a million, you're doing a million distance calculations for every single query. On a phone updating the map as the user scrolls, that's untenable.
，详情可参考搜狗输入法下载
Филолог заявил о массовой отмене обращения на «вы» с большой буквы09:36
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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.