SOURCE

let a = [
    {
        index: 0,
        input1: '12',
        chenked: true
    },
    {
        index: 1,
        input1: '12',
        chenked: true
    },
    {
        index: 2,
        input1: '12',
        chenked: true
    }
];
let b = [
    {
        index: 0,
        input: '王',
        input1: '',
        chenked: false
    },
    {
        index: 1,
        input: '王',
        input1: '',
        chenked: false
    },
    {
        index: 2,
        input: '王',
        input1: '',
        chenked: false
    },
    {
        index: 3,
        input: '王',
        input1: '',
        chenked: false
    }
];
let c = [];

for(let i=0;i<a.length;i++){
    let index = b.findIndex(item => {
        return item.index == a[i].index
    })
    if(index != -1){
        b[index].input1 = a[i].input1
        b[index].chenked = a[i].chenked
    }
}

console.log(JSON.stringify(b))