Javascript：获取字符串的最后几个字符

Question

如果我们将字符串存储在变量中，这是一个微不足道的问题。但出于好奇，我需要了解如何在不将字符串存储在变量中的情况下实现这一点？

//  To get first few characters of a string, we can do something like this:
var x = "amangupta".substring(0,7); //amangup

//  How to get last 7 characters
var x = "amangupta".substring(this.length - 7, this.length); // does not work, looking for similar approach

var str = "amangupta";
var x = str.substring(str.length - 7, str.length); // will work fine

Answer 1

如何获得最后7个字符

尝试

"amangupta".slice(-7)