const _completeDeepClone = (target, weak = new WeakMap()) => {
if (target === null) return target
if (typeof target !== 'object') return target
const constructor = target.constructor
if (/^(Function|RegExp|Date|Map|Set)$/i.test(constructor.name)) return new constructor(target)
if (weak.get(target)) {
return weak.get(target)
}
const cloneTarget = new target.constructor();
weak.set(target, true)
for (prop in target) {
if (target.hasOwnProperty(prop)) {
cloneTarget[prop] = _completeDeepClone(target[prop], weak)
}
}
return cloneTarget
}
var obj = { name:1 };
obj.age=obj
console.log(_completeDeepClone(obj))
