js之遞歸深拷貝

第一種方法

function getType( obj ){
	return Object.prototype.toString.call( obj ).slice( 8, -1 )
}
function deepCopy( obj ){
	let result,newObj = getType( obj )
	if(newObj == "Object"){
		result = {}
	}else if(newObj == "Array"){
		result = []
	}else{
		return obj
	}
	for(var i in obj){
		let copyObj = obj[i] 
		if(getType( obj ) == "Object" || "Array"){
			result[i] = deepCopy(obj[i])
		}else{
			result[i] = copyObj
		}
	}
	return result
}
           

第二種方法

function deepCopy(obj) {
    var newObj = null;
    if (typeof (obj) == "object" && obj != null) {
        newObj = obj instanceof Array && [] || {}

        for (var i in obj) {
            newObj[i] = deepCopy(obj[i])
        }

    } else {
        newObj = obj
    }
    return newObj;
}