js中数组合并的方法
js 数组合并

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let arr1 = ['温情', '刘聪']  
let arr2 = ['杨和苏', '邓紫棋']  
let arr3 = ['周延']

1. 

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arr1.concat(arr2, ······)  
es5 Array.concat() //合并两个数组, 返回新数组，不会改变原数组  
arr = arr1.concat(arr2, arr3);  
console.log(arr); // ["温情", "刘聪", "杨和苏", "邓紫棋", "周延"]

2. 

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[…arr1, …arr2，······]  
//es6 展开运算符(…)  
arr = [...arr1, ...arr2, ...arr3];  
console.log(arr); // ["温情", "刘聪", "杨和苏", "邓紫棋", "周延"]  
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push(…arr)  
//push 结合 ...[] 来实现, 会更改原数组  
arr1.push(...arr2, ...arr3)  
console.log(arr1); // ["温情", "刘聪", "杨和苏", "邓紫棋", "周延"]

适合两个数组，不适合多个数组的方法
1.

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for + push
for(let i in arr2) {
arr1.push(arr2[i])
}
console.log(arr1); // ["温情", "刘聪", "杨和苏", "邓紫棋"]
```  
   
2.

arr1.push.apply(arr1, arr2)
arr1.push.apply(arr1, arr2)
console.log(arr1); // [“温情”, “刘聪”, “杨和苏”, “邓紫棋”]
```