JavaScript深拷贝的一些踩坑记录

const obj = {
    arr: [111, 222],
    obj: {key: '对象'},
    a: () => {console.log('函数')},
    date: new Date(),
    reg: /正则/ig
}

JSON.parse(JSON.stringify(obj))

function isObj(obj) {
    return (typeof obj === 'object' || typeof obj === 'function') && obj !== null
}
function deepCopy(obj) {
    let tempObj = Array.isArray(obj) ? [] : {}
    for(let key in obj) {
        tempObj[key] = isObj(obj[key]) ? deepCopy(obj[key]) : obj[key]
    }
    return tempObj
}

var a = {}

a.a = a

function deepCopy(obj, hash = new WeakMap()) {
    if(hash.has(obj)) return hash.get(obj)
    let cloneObj = Array.isArray(obj) ? [] : {}
    hash.set(obj, cloneObj)
    for (let key in obj) {
        cloneObj[key] = isObj(obj[key]) ? deepCopy(obj[key], hash) : obj[key];
    }
    return cloneObj
}

// 只解决date，reg类型，其他的可以自己添加

function deepCopy(obj, hash = new WeakMap()) {
    let cloneObj
    let Constructor = obj.constructor
    switch(Constructor){
        case RegExp:
            cloneObj = new Constructor(obj)
            break
        case Date:
            cloneObj = new Constructor(obj.getTime())
            break
        default:
            if(hash.has(obj)) return hash.get(obj)
            cloneObj = new Constructor()
            hash.set(obj, cloneObj)
    }
    for (let key in obj) {
        cloneObj[key] = isObj(obj[key]) ? deepCopy(obj[key], hash) : obj[key];
    }
    return cloneObj
}