Analysis of the problem of error when the post method in Ajax directly returns a number starting with 0

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Today, I found a strange error when sending a simulated verification code on the web page. question. I used the following code to preset the button to send the verification code.

This is the Node.js server

<pre style="font-family: 宋体; font-size: 9pt; background-color: rgb(255, 255, 255);"><pre name="code" class="javascript">$(".reg_code_btn").click(function(e){ 
  $(e.target).parent().children().first().val() 
  $.ajax({ 
    type:"POST", 
    url:"validate/vcode", 
    dataType:"json", 
    data:{ 
      vcode:"code" 
    }, 
    success:function(data){ 
      console.log(data); 
      alert(data); 
    }, 
    error:function(data){ 
      console.log(data); 
      alert("发生错误"); 
    } 
  }); 
});</pre><br> 
<br> 
<pre></pre> 
<pre></pre> 
调试结果如下：</pre>

Starting with 0

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