$ .get并获得价值 [英] $.get and get value

问题描述

 function get(){
      $.get('/get.php', function(data) {
          alert('one: ' + data)
          return data;
      });
  }

  var test = get();
  alert('two:' + test);

在get.php中：

<?php echo "number"; ?>

为什么一个提醒显示
一：数字

但两个提示显示
两个：未定义

我怎么能在函数外得到这个值？

How can i get this value outside function?

推荐答案

$。get 调用是异步。这意味着你传递了一个回调（你的函数（数据）{...} ，它将通过调用的结果执行。你不能从回调内部返回 - 当它被执行时，你的外部函数（执行 $。get ）已经返回。尝试这样的事情：

The $.get call is asynchronous. That means that you pass it a callback (your function(data) { ... }, which gets executed with the result from the call. You can't return from inside that callback - when it is executed, your outer function (doing the $.get) has already returned. Instead, try something like this:

// callback will be executed with the response from your GET request
function get(callback){
    $.get('/get.php', callback);
}

// Call get with a callback receiving the response
get(function(data) {
    alert('two:' + data);
});

这是在编写javascript代码时必须习惯的模式。

This is a pattern you will have to get used to when writing javascript code.

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