javascript - 如何从数组中删除未引用的对象

Question

我有一个看起来像这样的对象:

obj = {"students":[{"name":"Jenna","grade":"B"}, {"name":"Alex","grade":"C"}]}

我想删除我将像这样引用的对象之一:

delete obj.students[0]

这应该从学生对象中删除第一个对象{"name":"Jenna","grade":"B"}，但事实并非如此。

Answer 1

对对象使用delete运算符，而不是数组。

The JavaScript delete operator removes a property from an object; if no more references to the same property are held, it is eventually released automatically. (mdn)

对于数组，有许多替代方案，在本例中最简单的是 splice ( mdn )，它可以方便地允许删除(或添加)从指定索引。

let obj = {"students":[{"name":"Jenna","grade":"B"}, {"name":"Alex","grade":"C"}]};
obj.students.splice(0, 1);

console.log(obj);