jquery key相同，value加和，最后按照key值排序，求教？

Question

vararr=[{"32":297},{"32":3944},{"322":297},{"322":297},{"312":3944},{"312":297},{"132":3944},{"32":3944},{"34":458}]期望：key相同的，value加和，最后排序

Answer 1

varobj={}
arr.forEach(item=>{
Object.keys(item).forEach(key=>{
if(obj[key]){
obj[key]+=item[key]
}else{
obj[key]=item[key]
}
})
})
varret=Object.keys(obj).sort((a,b)=>obj[a]-obj[b]).map(key=>({
[key]:obj[key]
}))
console.log(ret)
                            

Answer 2

取巧写一个
letarr1=Object.entries(arr.reduce((res,val)=>(key=Object.keys(val)[0],{...res,[key]:val[key]+res[key]||0}),{})).sort((a,b)=>a[1]-b[1]).map(val=>({[val[0]]:val[1]}))
console.log(arr1)