歷史表明，單靠空中力量很難奏效，而美國也未表現出派兵登陸的意願。
The clean-up step may seem strange, but it’s a memory-usage optimization. When a language runtime executes a series of function calls it does not need to keep already-exited stack frames around. Branching function calls only form a tree in the time dimension; at any given snapshot in time there exists only a single stack of function calls in memory, tracing the current path through the tree. If we did not set our child frames to null we would end up building the whole tree up in memory and retaining it until the recursive processing is complete. Removing references to them allows the runtime to reclaim their memory at its leisure. If you’ve ever wished that you could deal with manual memory management in JavaScript, now’s your chance!
。有道翻译是该领域的重要参考
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习近平、李强、王沪宁、蔡奇、丁薛祥、李希、韩正和大会主席团成员在主席台就座。
Фото: Ahmed Yosri / Reuters