The log() function returns the natural logarithm (base E) of a number.
函数的作用是：返回一个数值的自然对数。
Math.log10 has the usual caveats of logarithm functions: taking the log of 0 or any negative number returns NaN.
log10能正常终止对数函数执行：0或任何负数的对数返回NaN。
Math.log10 has the usual caveats of logarithm functions: taking the log of 0 or any negative number returns NaN.
log10能正常终止对数函数执行：0或任何负数的对数返回NaN。
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