js遍历json数据的步骤

js遍历json数据的方法
<script type="text/javascript">
  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>