【JavaScript】連想配列のkeyとvalueの取得

var customers = { "田中太郎":"03-53xx-xxxx", "田中二郎":"03-54xx-xxxx", "田中花子":"03-55xx-xxxx" };

for(key in customers){
  alert(key + "さんの番号は、" + customers[key] + "です。") ;
}

ネタ元

• https://qiita.com/glaytomohiko/items/852ea64bcfc1e4fc1b51