* @param {string} num 非负整数的字符串形式（可能含前导零）
Note however that depending on as well as the distribution of colours in the palette, there may not always be an exact solution for any given . Instead we’ll say that we want to minimise the absolute error between and some linear combination , or .
。关于这个话题，im钱包官方下载提供了深入分析
Objects have a class, and a fixed size based on their class.，这一点在旺商聊官方下载中也有详细论述
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