javascript - JavaScript 中拼接函数的使用

Question

拼接函数不能写在console.log里面？？我尝试了这两种方法 -

const arr1 = ["a","b","c","d","e","f"];
console.log(arr1.splice(1,4,"HI"));

此代码的输出= ['a'，'HI'，'f']

const arr1 = ["a","b","c","d","e","f"];
arr1.splice(1,4,"HI");`enter code here`
console.log(arr1);

此代码的输出= ['b'，'c'，'d'，'e']`

有什么不同？

标签： javascriptarrayssliceconsole.logsplice

Answer 1

在第一个示例中，您正在记录（包含已删除元素的数组）的返回值。splice

在第二个示例中，您正在记录mutated array。

---

const arr1 = ["a", "b", "c", "d", "e", "f"];
const return_value = arr1.splice(1, 4, "HI");
console.log({
  return_value,
  arr1
});