deepClone深拷贝

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//空间换时间

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export default function memo(func, hasher){
	const cache = {};
	return function(...args){
		let key = ""+(hasher ? hasher(...args) : args[0])
		if(!cache[key]){
			cache[key] = function(...args);
		}
		return cache[key]
	}
}

JSON.parse(JSON.stringfy())
实现深拷贝—缺陷：不能拷贝Symbol、函数、循环引用。

深拷贝——简介版

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function deepClone = obj => {
	if(typeof obj != "object" || obj === null){
		return obj;
	}
	let result;
	if(base instanceof Array){
		result = [];
	} else {
		result = {};
	}
	for(let item in base){
		if(base.hasOwnProperty(item)){
			result[item] = deepClone(base[item])
		}
	}
	return result;
}

深拷贝—— 可以解决循环引用

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export default deepClone = base =>{
	const baseStack=[];
	const targetStack = [];
	let _clone = base => {
		if(typeof base != "object" || base === null){
			return base;
		}
		let target = {};
		if(Array.isArray(base)){
			target = [];
		}
		const index = baseStack.indexOf(base);
			if(index != -1){
			return targetStack[index];
		}
		
		baseStack.push(base);
		targetStack.push(target);
		
		for(let i in base){
			target[i] = _clone(base[i]);_
		}
		return target;
	}_
}