Invalid Ajax post assignment

YesterdayProgramThe value assignment is invalid during Ajax post. si_id has a value in the callback function of post, but it cannot be obtained outside the post function?

VaR si_id $. Post ("/sysbrand/check_name/", {Name: name, type: Type}, function (data) {si_id = data ;});

After checking the information, I found that AJAX asynchronous submission is the problem. Ajax is asynchronously submitted by default. js will be executed from top to bottom, and will not be executed after the Ajax post callback is successful.Code. In fact, the code below post is executed before the code in the callback function, so the value will not be obtained outside post. We only need to set it to synchronization. The method is as follows:

VaR html = $. Ajax ({
URL: "Some. php ",
Async: false
}). Responsetext;

Or set Ajax properties globally.
$. Ajaxsetup ({
Async: false
});
Use post, and get is synchronized.