Comparison of different examples of ajax and post processing json in jQuery_jquery

Recently, when I was making user comments on the portal, I hadn’t used jquery for a long time and I just happened to use it. I didn’t expect to cut corners and use the post method to process the json data of the ajax callback. I couldn’t get it, and there was json returned in the background. . Unexpectedly, such a small problem hung me up for several hours. Later, I handled it with the ajax method and it was OK. After a comparison, I found that the post method callback json must be eval, and the ajax method has been processed by default. Please be careful.

function haha() {
jQuery.post("addComment!comment.action",
function aa(data) {
data = eval(data);//POST方法必加，ajax方法自动处理了
alert(data[0].userId);
alert(data[0].userName);
},
"json"
);

jQuery.ajax({
type:"post",
url:"addComment!comment.action",
dataType:"json",
success: function aa(data) {
alert(data[0].userId);
alert(data[0].userName);
}
});
}

Backstage:

Copy code The code is as follows:

public String comment() {
try{
User u = new User("user", "koko");
list = new ArrayList4c8e0c17c3bd7e0081bb17cc795e1984();
list.add(u);
//map.put("id", userId);
// JSONObject jb = JSONObject.fromObject(list); // name:" userName ",
// info = jb.toString();
System.out.println(list);
}
catch (Exception e) {
e.printStackTrace();
}
return SUCCESS;
}

Configuration:

Copy code The code is as follows:

2678acd061d93e3b616b00474912c4fa
b14aadd1f0c5390d75d10388858e6400
6c3a65a197edb72c1848318f5c8eec68
3304a7319e3272402abe8d15d3e9329clist8bb7487ae6a16a43571bc14c7fcf93c2
6f55ec50a52710d38f3a2f7e427abe79
bd366a3fff9c30beec99faf698cf52ce