javascript - Join() vs toString() vs valueOf() in Javascript

Question

Can anyone tell me the exact difference between join() and toString() and valueOf()in Javascript. When and at what situation we need to use them?

Answer 1

toString是一种方法，您不仅可以在Arrays 中找到，而且可以在每个对象中找到。

join允许您将Array对象的每个元素转换为字符串，并使用分隔符连接在一起。它的行为就像toStringfor Arrays，但你也可以指定分隔符：

var classes = ["first", "second"];
classes.join(" ");    // "first second"