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1. 实现一个深拷贝
const isObject = obj => typeof obj === 'object' && obj != null
const cloneDeep = (source, hash = new WeakMap()) => {
if (!isObject(source)) return source // 非对象返回自身
if (hash.has(source)) return hash.get(source) // 查哈希表
let target = Array.isArray(source) ? [] : {}
hash.set(source, target) // 哈希表设值
for (let key in source) {
if (Object.prototype.hasOwnProperty.call(source, key)) {
if (isObject(source[key])) {
target[key] = cloneDeep(source[key], hash) // 传入哈希表
} else {
target[key] = source[key]
}
}
}
return target
}
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