object function value

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。

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。

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。