SOURCE

const obj1 = {
    a: 1,
    b: 2,
    c: {
        x: 3,
        y: 4,
    }
}
const obj2 = deepClone(obj1)
obj2.c.x =  4
console.log(obj2)
console.log(obj1)
// 深拷贝
function deepClone(obj = {}) {
    if (typeof obj !== 'object' || obj == null) {
        return obj
    }
    const result = Array.isArray(obj) ? [] : {}
    for (let key in obj) {
        result[key] = deepClone(obj[key])
    }
    return result
}


// 深度比较
function isObject(obj) {
    return typeof obj === 'object' && obj !== null
}
function isEqual(obj1, obj2) {
    if (!isObject(obj1) || !isObject(obj2)) {
        return obj1 === obj2
    }
    if (obj1 === obj2) return true
    const obj1Keys = Object.keys(obj1)
    const obj2Keys = Object.keys(obj2)
    if (obj1Keys.length !== obj2Keys.length) return false
    for(let key of obj1Keys) {
        const res = isEqual(obj1[key], obj2[key])
        if (!res) return false
    }
    return true
}
console.log(isEqual({a:1, b: {c: 1}}, {a: 1, b: {c: 1}}))

// 手写bind
Function.prototype.bind1 = function() {
    const args = Array.prototype.slice.call(arguments)
    const t = args.shift()
    this.apply(t, args)
}
function fn(a,b,c) {
    console.log('this', this)
    console.log(a,b,c)
}

fn.bind1({a:1}, 1,23,4)