javascript - 从 Javascript 对象中检索值

Question

如何从下面的对象中检索值？

var recipe= {};
recipe[0, 'prodmem_active.tpoint_prod[0].setpoint'] = 1600;
recipe[0, 'prodmem_active.tpoint_prod[1].setpoint'] = 1300;
recipe[1, 'prodmem_active.tpoint_prod[0].setpoint'] = 1600;
recipe[1, 'prodmem_active.tpoint_prod[1].setpoint'] = 1300;
recipe[2, 'prodmem_active.tpoint_prod[0].setpoint'] = 1500;
recipe[2, 'prodmem_active.tpoint_prod[1].setpoint'] = 1200;

例如alert(recipe[1]['prodmem_active.tpoint_prod[1].setpoint']) 不起作用。

Answer 1

您必须首先正确分配该值。

逗号运算符的计算结果是其右侧。

这个:

recipe[0, 'prodmem_active.tpoint_prod[0].setpoint'] = 1600;

含义相同:

recipe['prodmem_active.tpoint_prod[0].setpoint'] = 1600;

您正在尝试创建一个新对象，然后为新对象属性之一赋值。

recipe[0] = {};
recipe[0]['prodmem_active.tpoint_prod[0].setpoint'] = 1600;