Store ajax result in jQuery variable

问题

I started using jQuery and ajax to get data from database, but i cant find out how i can save result of $.get() into variable outside callback function.

This is my jquery script:

var result="";     
$.get("test.php", function(data){ result=data; });
alert(result);

This is test.php script:

echo "Hello, World";

Every time i run this script it alerts "".

回答1:

Try this:

var result = "";
$.get("test.php", function (data) {
    SomeFunction(data);
});

function SomeFunction(data) {
    result = data;
    alert(result);
}

回答2:

Your alert will get fired before the $.get can return any data.

Make the alert run on an event instead - such as a click:

var result="";     
$.get("test.php", function(data){ result=data; });
<span onclick="alert(result);">show alert</span>

来源：https://stackoverflow.com/questions/15964734/store-ajax-result-in-jquery-variable