The execution sequence of a piece of code outside the Jquery $.ajax function

The JQuery asynchronous function $.ajax is called, and then there is a piece of Jquery code outside the $.ajax function. Every time, the code after $.ajax is executed first

I encountered a very painful problem today. The JQuery asynchronous function $.ajax is called in a function, and then there is a piece of Jquery code outside the $.ajax function. Every time, the code after $.ajax is executed first.

After searching online for a long time, I finally found the reason. Take it and share it with everyone so that you don’t forget it later.

async:false

var flag=true; 

//async:false代表只有在等待ajax执行完毕后才执行 
$.ajax({url:"EmailCheck.ashx",async:false,data: {"email":$("#email").val()} }).done(function(data) { 
if(data=="Fail") 
{ 
flag=false; 
} 
}); 

if(flag) 
{ 
$("#showInfo").text(""); 
return true; 
} 
else 
{ 
alert("该邮箱已存在!"); 
$("#showInfo").text("该邮箱已存在"); 
return false; 
}</span>

The above is what I compiled for everyone. I hope it will be helpful to everyone in the future.

Related articles:

Convert form elements to JSON by constructing AJAX parameters

Discuss some minor issues in Ajax

ajax callback opens a new form to prevent browser interception Effective method_AJAX related

The above is the detailed content of The execution sequence of a piece of code outside the Jquery $.ajax function. For more information, please follow other related articles on the PHP Chinese website!