js 原色插到数组最后第二位
怎么把b插入到a中,从a倒数第二个元素往后插入
a = [
{ name:'1'
},
{
name:'2'
},
{
name:'3'
}
]
b = [
{ name:'4'
},
{
name:'5'
}
]
回答:
a.splice(-1, 0, ...b)console.log(a)
回答:
a = [
{
name:'1'
},
{
name:'2'
},
{
name:'3'
}
]
b = [
{
name:'4'
},
{
name:'5'
}
]
a.slice(0,-2).concat(b.concat(a.slice(-2)))
/*
0: {name: "1"}
1: {name: "4"}
2: {name: "5"}
3: {name: "2"}
4: {name: "3"}
length: 5
*/
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