各位js大神,请教以下如下俩个对象数组如何合并为一个？

Question

arr1:
[{"msg":"你也好","from":"libai"},{"msg":"我是李白,你是谁","from":"libai"}]
arr2:
[{"msg":"你好","from":"admin"},{"msg":"LOL吗","from":"admin"},{"msg":"我是系统管理员,你是李白吗","from":"admin"}]
我想让合并后的数组为
[{"msg":"你也好","from":"libai"},{"msg":"我是李白,你是谁","from":"libai"},{"msg":"你好","from":"admin"},{"msg":"LOL吗","from":"admin"},{"msg":"我是系统管理员,你是李白吗","from":"admin"}]
,应该调用什么方法呢

Answer 1

js的数组合并有三种方法，任何一种都可以做到你需要的结果，如下：

concat 方法

var arr1=[{"msg":"你也好","from":"libai"},{"msg":"我是李白,你是谁","from":"libai"}];

var arr2=[{"msg":"你好","from":"admin"},{"msg":"LOL吗","from":"admin"},{"msg":"我是系统管理员,你是李白吗","from":"admin"}];

var arr=arr1.concat(arr2);

console.log(c);//你要的结果，不改变arr1和arr2

循环遍历

var arr1=[{"msg":"你也好","from":"libai"},{"msg":"我是李白,你是谁","from":"libai"}];

var arr2=[{"msg":"你好","from":"admin"},{"msg":"LOL吗","from":"admin"},{"msg":"我是系统管理员,你是李白吗","from":"admin"}];

for(var i=0;i<arr2.length;i++){

    arr1.push(arr2[i]);

}

console.log(arr1);//你要的结果，但是这个是直接改变了arr1这个数组

apply方法

合并数组arr1和数组arr2,使用Array.prototype.push.apply(arr1,arr2)  or arr1.push.apply(arr1,arr2);

var arr1=[{"msg":"你也好","from":"libai"},{"msg":"我是李白,你是谁","from":"libai"}];

var arr2=[{"msg":"你好","from":"admin"},{"msg":"LOL吗","from":"admin"},{"msg":"我是系统管理员,你是李白吗","from":"admin"}];

Array.prototype.push.apply(arr1,arr2); //或者 arr1.push.apply(arr1,arr2);

console.log(arr1) //改变了arr1

   

Answer 2

eq.
[...arr1, ...arr2]
eq.
arr1.contact(arr2)