英國超市將巧克力鎖進防盜盒阻止「訂單式」偷竊
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In April 1970, it was Jim Lovell's turn. Fortunately, the crew of Apollo 13 did not believe in unlucky numbers.,这一点在91视频中也有详细论述
// 易错点3:必须先判断stack2.length0,再访问stack2.at(-1)(避免栈空时取到undefined)