从jquery获取返回值获取?

本文介绍了从jquery获取返回值获取?的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

我正在对 get 和 getJSON 进行 jquery 调用，但无法访问回调函数之外的返回值.如何访问返回的数据?

I am making jquery calls to get and getJSON, but cannot access returned values outside of callback function. How can I access the returned data?

var firstid; var nextid; $.get(callUrl, function(data) { // call to add node var n = data.indexOf("id-"); var m = data.indexOf("id-"); firstid = data.substr(n+3,m - (n+3)); nextid = data.substr(m+3); alert("firstid:" + firstid); // returns correct value }); alert("firstid:" + firstid); // returns undefined for firstid

如何在函数外获取 firstid?

how can I get firstid outside the function?

推荐答案

所有 AJAX 调用都是异步的

所以您需要使用回调.任何外部都将返回 undefined.

SO you need to use callbacks. anything outside that will return undefined.

$.get(callUrl, function(data) { // call to add node var n = data.indexOf("id-"); var m = data.indexOf("id-"); firstid = data.substr(n+3,m - (n+3)); nextid = data.substr(m+3); doSomethingWithFirst(firstid); }); function doSomethingWithFirst(f) { //NOW do something }