var data = {"0":{"id":1,"title":"1","content":"<p>1asdfasdf</p>","publisher":"3asdf ","views":0,"create_time":1490173181,"create_user":1,"status":0},"1":{"id":2,"title":"2","content":"<p>asdfasdf</p>","publisher":"asdfadsf","views":0,"create_time":1490173186,"create_user":1,"status":0},"2":{"id":3,"title":"3","content":"<p>2</p>","publisher":"3","views":0,"create_time":1490250129,"create_user":1,"status":0},"success":true}}

for(var i in data){

console.log(data[i].id);

}

var jStr = {"0":{"id":1,"title":"1","content":"<p>1asdfasdf</p>","publisher":"3asdf ","views":0,"create_time":1490173181,"create_user":1,"status":0},"1":{"id":2,"title":"2","content":"<p>asdfasdf</p>","publisher":"asdfadsf","views":0,"create_time":1490173186,"create_user":1,"status":0},"2":{"id":3,"title":"3","content":"<p>2</p>","publisher":"3","views":0,"create_time":1490250129,"create_user":1,"status":0},"success":true}
    for(var i in jStr){
        if(jStr[i].id){
            console.log(jStr[i].id)
        }
    }

$.get('a.json',function (data,status) {
    console.log(data)
    for(var i=0;i<data.length;i++){
       console.log(data[i])
    }
})

例如:

var arr = {"1":{"id":1,"name":"test"},"2":{"id":2,"name":"测试"}};
  $.each(arr,function(idx,item){    
   //输出
   alert(item.id+","+item.name);
})