JS 循环遍历JSON数据

<script type="text/javascript">
function text(){
var json = {"options":"[{\"text\":\"王家湾\",\"value\":\"9\"},{\"text\":\"李家湾\",\"value\":\"10\"},{\"text\":\"邵家湾\",\"value\":\"13\"}]"}
json = eval(json.options)
for(var i=0; i<json.length; i++)
{
alert(json[i].text+" " + json[i].value)
}
}
</script>

var data=[{"name":"a","age":12},{"name":"b","age":11},{"name":"c","age":13},{"name":"d","age":14}];
for(var o in data){
alert(o);
alert(data[o]);
alert("text:"+data[o].name+" value:"+data[o].age );
}