需求：

把oldData里与newData相同的项替换成newData所对应的，如果newData里没有跟oldData相同的项就不替换

var oldData = [    { name:"b",state:"no" },    { name:"d",state:"no" },    { name:"e",state:"no" },    { name:"f",state:"no" }]var newData = [    { name:"a",state:"yes" },    { name:"b",state:"yes" },    { name:"f",state:"yes" }]复制代码

解决方案：

var result = []result = oldData.map((item,index)=>{    let update = newData.find((el,i)=>{ return el.name===item.name});    return update?update:item})console.log(result)// 合并后的结果要求如下// [//     { name:"b",state:"yes" },//     { name:"d",state:"no" },//     { name:"e",state:"no" },//     { name:"f",state:"yes" }// ]复制代码