* @param {string} num 非负整数的字符串形式（可能含前导零）
The tech industry's biggest mobile show may not quite have the clout it once did, when the likes of Samsung, Sony, LG, and HTC showcased new flagships there each year, but it still attracts more phone launches than CES does two months earlier. It's especially popular with the Chinese manufacturers who are still fighting for space in the global market, along with niche manufacturers who turn up with extra-durable "rugged" devices, or battery beasts that are more powe …
，这一点在safew官方版本下载中也有详细论述
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