function isObj(obj){
return typeof obj === 'object' && obj !== null
}
function deepMerge(...args){
const merge = (target, source) => {
const _target = {...target}
Object.keys(source).forEach(key =>{
const _targetValue = _target[key]
const _sourceValue = source[key]
if(!isObj(_sourceValue) || Array.isArray(_sourceValue) || (!isObj(_targetValue) && isObj(_sourceValue)) ){
_target[key] = _sourceValue
}else if(isObj(_sourceValue) && isObj(_targetValue)){
_target[key] = merge(_targetValue,_sourceValue)
}
})
return _target
}
return args.reduce((cur,pre)=> merge(cur,pre),{})
}
console.log('deepMerge',deepMerge({a:1,b:2,e:{e1:100,e2:{e3:1000}}},{c:3,d:4,e:{e1:101,e2:{e3:1001,e4:1002}}}))
