在Javascript中将函数值传递给其他函数 [英] Pass a value from function to other functions in Javascript

问题描述

我需要从javascript函数中的HTML输入中获取值。我可以成功地从HTML中获取值，但我无法将其从1个函数传递给其他函数。我需要将该值传递给该javascript上可用的其他函数。我尝试了这段代码我未定义。

I need to get a value from an HTML input in a javascript function. I can successfully get the value form the HTML but I couldn't pass that from 1 function to other. And I need to pass that value to other function that is available on that javascript. I tried this code I'm getting undefined.

这是我的HTML代码：

This is my HTML code:

<input value="3232" id="fn">

这是我的主要功能脚本，我可以从HTML中获取值：

This is my script with the main function, and I can get the value from the HTML:

var PageKey = function(){
 var val = document.getElementById('demo').value
}

 var fun1 = function(data){

 }

 var fun2 = function(data){

 }

 var fun3 = function(data){

 }

这就是我的尝试：

     var fun3 = function(data){
       PageKey();
     }

推荐答案

PageKey（）只是获取值，但它不会返回它。因此，您需要将 return val; 添加到 PageKey（）。然后，在fun3中，您可以将变量设置为从 PageKey（）返回的变量。所以，你最终得到这个：

PageKey() is just getting the value, but it does not return it. So, you need to add return val; to PageKey(). Then, in fun3, you can set a variable to what's returned from PageKey(). So, you would end up with this:

var PageKey = function(){
 var val = document.getElementById('demo').value;
 return val;
}

 var fun1 = function(data){

 }

 var fun2 = function(data){

 }

 var fun3 = function(data){
   var val = PageKey();
   console.log(val);
   // prints out what PageKey got
   fun1(val);
   fun2(val);
 }

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