json格式的数据遍历【循环】如果数据结构是这样var data=http://www.mamicode.com/[{name:"a",age:12},{name:"b",age:11},{name:"c",age:13},{name:"d",age:14}];  for(var o in data){    alert(o);//索引  0,1,2....  alert(data[o]);//  {name:"a",age:12},{name:"b",age:11}....  alert("text:"+data[o].name+" value:"+data[o].age );  }