Generally, to nonlinear problem, gradient-based method is faster than simple method, and may improve efficiency due to using conjugate variables to calculate object function value.

梯度法对许多非线性问题均具有较好的性能，计算目标函数可以使用新的共轭变量法，有望显著提高寻优效率。

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For each value in storage, you once again use the JSON.parse function to parse the string back into an object.

对于存储中的每一个值，我们再次使用JSON . parse函数来将字符串解析成为一个对象。

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Notice, however, that the function itself is just another property of the person object and that, without the parentheses, it would refer to an undefined value.

然而要注意的是，该函数本身也只是另一个person对象的属性，如果没有圆括号，它将引用一个未定义的值。

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