js 笔记 数据的深度克隆

	const checkTargetType = target => Object.prototype.toString.call(target).slice(8,-1);
	const clone = target => {
		let result,targetType = checkTargetType(target)
		if(targetType === 'Object' || targetType === 'Array'){
			result = targetType === 'Object'?{}:[]
		}else{
			return target;
		}
		for(let i in target){
			result[i] = clone(target[i])
		}
		return result;
	}