js 数组的常用操作函数

var array = ["jeiw","sfwe","fasfwe","ftqq","hjweq","jfoiwe"];
   var newArrray = ["qqq","www","eee","rrr","ttt","yyy"];

1. concat()

• 连接一个或多个数组

• 返回连接后的新数组

  console.log(    array.concat(newArrray)    );

---

2. push()

• 从数组的后面添加数组

• 返回新数组的长度

  console.log(    array.push(newArrray)    );

array.push(newArrray)
   console.log(array);

---

3. unshift()

• 从数组的前面添加数组

• 返回新数组的长度

  console.log(array.unshift(newArrray));

array.unshift(newArrray)
   console.log(array);

---

4. join()

• 将数组变成字符串（默认是逗号分隔，可指定符号）

• 返回分割后的字符串

  console.log(    array.join(newArrray)    );

console.log(    array.join("-")    );

---

5. pop()

• 删除数组的最后一个元素

• 返回被删除的元素

  console.log(array.pop());  
     console.log(array);

---

6. shift()

• 删除数组的第一个元素

• 返回被删除的元素

  console.log(array.shift());  
     console.log(array);

---

7. revarse()

• 反转数组的排序

• 返回反转后的数组

  console.log(array.reverse());

8. includes()

• 判断是否包含该参数
• 返回true或false

let MSids = [
       "1000010000124855",
       "1000010000124856",
       "1000010000124857",
       "1000010000124858",
       "1000010000124860",
       "1000010000124861",
       "1000010000124863",
       "1000010000124865"
     ];
 if (MSids.includes("1000010000124861")) {
    console.log("包括")
  } else {
     console.log("不包括")
  }

https://blog.csdn.net/qq_42618566/article/details/104664040