js 合并两个数组

将下面两数组合并

var arr1 = [1,2,3];

var arr2 = [4,5,6];

1.简单好理解

var arr3 = [];

//遍历arr1

for (var i = 0; i < arr1.length; i++) {

 arr3.push(arr1[i]);

}

//遍历arr2

for (var j = 0; j < arr2.length; j++) {

 arr3.push(arr2[j]);

}

console.log(arr3); //[1,2,3,4,5,6]

2.concat()方法

var arr1 =[1,2,3];

var arr2 = [4,5,6];

var arr3 = arr1.concat(arr2);

console.log(arr3); //[1,2,3,4,5,6]

顶

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