1. function deepClone1(obj, hash = new WeakMap()){
    2.     if(hash.has(obj)){
    3.         return hash.get(obj)
    4.     }
    6.     if(!isObject(obj)){
    7.         return obj
    8.     }
    10.     let newObj
    12.     let constructor = obj.constructor
    14.     switch(constructor){
    15.         case Date: 
    16.             return new Date(obj);
    17.         case RegExp:
    18.             return new RegExp(obj)
    19.         case Number:
    21.         case String:
    23.         case Boolean: 
    25.         default:
    26.         newObj = new constructor(obj)
    27.         hash.set(obj, newObj)
    28.     }
    30.     Reflect.ownKeys(obj).forEach(key => {
    31.         newObj[key] = deepClone(obj[key],hash)
    32.     })
    34.     return newObj
    35. }
    37. function isObject(obj){
    38.     return obj !== null && typeof obj === 'object'
    39. }
    41. function deepClone(val,map = new WeakMap()){
    42.     if(val === null || typeof val !=='object') return val;
    43.     //循环引用
    44.     if(map.has(val)) return map.get(val);
    45.     let clone = Array.isArray(val) ? [] : {};
    46.     map.set(val,clone);
    47.     // 获取对象中所有的属性名（包含Symbol值）
    48.     let keys = Reflect.ownKeys(val);
    49.     console.log(keys)
    50.     let len = keys.length;
    51.     while(len--){
    52.         console.log(keys[len])
    53.         clone[keys[len]] = deepClone(val[keys[len]],map);
    54.     }
    55.     return clone;
    56. }
    58. // deepClone1([2,4,{a:1}])
    61. function checkNumber(val){
    62.     return typeof val === 'string' && !isNaN(Number(val))
    63. }
    65. function getNumber(val){
    66.     if(typeof val === 'number'){
    67.         return val
    68.     }
    70.     if(!isNaN(Number(val))){
    71.         return Number(val)
    72.     }
    74.     return 0
    75. }
    77. function add(num1, num2){
    78.     if(checkNumber(num1) && checkNumber(num2)){
    79.         let arr1 = num1.split('').reverse()
    80.         let arr2 = num2.split('').reverse()
    81.         let temp = 0;
    82.         let len = Math.max(arr1.length, arr2.length)
    83.         let result = []
    84.         for(let i = 0; i<= len; i++){
    85.             temp = getNumber(arr1[i]) + getNumber(arr2[i]) + temp
    86.             result[i] = temp % 10
    87.             temp = temp > 9 ? 1 : 0
    88.         }
    90.         result.reverse()
    92.         return result[0] > 0 ? result.join('') : result.join('').slice(1)
    93.     }
    95. }
    97. add('111324324', '3241412342134')