用closure解leetcode

https://leetcode.com/problems/subdomain-visit-count

/**
 * @param {string[]} cpdomains
 * @return {string[]}
 */

var subdomainVisits = function(cpdomains) {
    // ["900 google.mail.com", "50 yahoo.com", "1 intel.mail.com", "5 wiki.org"]
    let domainWrap = {
      result: {},
      addCount: function(domain, count) {
          if(!this.result[domain]) {
                this.result[domain] = count;
            } else {
                this.result[domain] = this.result[domain] + count;
            }
      }
    };
    for(let i=0; i<cpdomains.length; i++) {
        const cpdomainsArray = cpdomains[i].split(' ');
        let count = parseInt(cpdomainsArray[0]);
        let domain = cpdomainsArray[1];
        if(domain.match(/\w*\.\w*\.\w*/i)) {
            let keywords = domain.split('\.');
            domainWrap.addCount(domain, count);
            domainWrap.addCount(`${keywords[1]}.${keywords[2]}`, count);
            domainWrap.addCount(`${keywords[2]}`, count);
            
        } else if(domain.match(/\w*\.\w*/i)) {
            let keywords = domain.split('\.');
            domainWrap.addCount(domain, count);
            domainWrap.addCount(`${keywords[1]}`, count);
        } else {
            domainWrap.addCount(domain, count);
        }
    }
    
    // console.log(domainWrap.result);
    return Object.keys(domainWrap.result).map(key => `${domainWrap.result[key]} ${key}`);
};