合并数组
this.multipleSelection.forEach((val)=>{
this.returnData.push(val)
})
根据唯一标识对对象数组去重
let hash = {};
this.returnData = this.returnData.reduce((preVal, curVal) => {
hash[curVal.skuId] ? '' : hash[curVal.skuId] = true && preVal.push(curVal);
return preVal
}, [])