json定义及jquery操作json的方法

JSONArray jsonArray = newJSONArray();JSONObject attchJson = newJSONObject();attchJson.put("attchId","0");

attchJson.put("attchName", "附件0");jsonArray.put(attchJson);jsonArray即为一个json数据，等价于用[]的定义一个json.

JSONArray taskJsonArray = newJSONArray();JSONObject taskJsonObj = newJSONObject();taskJsonObj.put("taskId",100);

taskJsonObj.put("taskName", "myTask");taskJsonObj.put("attchs",jsonArray);taskJsonArray.put(jsonObj);

[{"attchs":[{"attchName":"附件0","attchId":0},{"attchName":"附件1","attchId":1},{"attchName":"附件2","attchId":2}],"taskId":100,"taskName":"myTask"}]

var json = eval_r(jsonArray );
 for(var i=0;i<json.length;i++){ 
 alert("attchId:"+json[i].attchId+",attchName:"+json[i].attchName);
}

 $.getJSON("jsonTest",{showNumber:"3"},function(data){    
 
 $.each(data,function(idx,item){
   //alert(idx);
   if(idx<0){
    returntrue;//同countinue，返回false同break
   } 
   alert("attchId:"+item.attchId+",taskName:"+item.attchName); 
   }); });