javascript遍历对象

方式一

var obj = {'0':'a','1':'b','2':'c'};

for(var i in obj) {
  console.log(i,":",obj[i]);
}

方式二

var obj = {'0':'a','1':'b','2':'c'};

Object.keys(obj).forEach(key => {
  console.log(key,obj[key]);
})