javascript - Why does the data returned by ajax prompt object?

After running, why does the prompt result show [object Object], [object Object] instead of specific data?
This result should be like this [{title: "3333333333333"}, {title: "3333333333333"}]
Then I tried it againalert(obj.title) It prompts undefined. Why is this?

<code>$res=$xiao->field("title")->select();
$this->ajaxReturn($res);


ajax("{:U('zhuye/zhuye')}",oV1,function(str){
   var obj = eval("("+str+")");
   alert(obj);
});</code>

Reply content:

After running, why does the prompt result show [object Object], [object Object] instead of specific data?
This result should be like this [{title: "3333333333333"}, {title: "3333333333333"}]
Then I tried it againalert(obj.title) It prompts undefined. Why is this?

<code>$res=$xiao->field("title")->select();
$this->ajaxReturn($res);


ajax("{:U('zhuye/zhuye')}",oV1,function(str){
   var obj = eval("("+str+")");
   alert(obj);
});</code>

Use jquery to solve your problem, please read the documentation for details

obj is an Array of two Objects, not an Object

Tryalert(obj[0].title); alert(obj[1].title);

Try it. What comes out should be the array form you mentioned.

<code>var obj = JSON.parse(str)

alert(obj);</code>

Just add a return data type, dataType:json

Print it out and read it. . . .

should be

<code>   alert(obj[0].title);
</code>

Your data is already an Object. When you are eval or JSON.prase, you are calling obj.toString();

You will know what the problem is if you look at the difference between JavaScript literal objects and json.

The return type is not in json format, right?