从不同的函数访问变量 [英] Accessing variable from different function
问题描述
我在HTML中使用以下代码创建了一个按钮,单击该按钮会在我的页面中创建一些问题,效果很好.
I have the following code in HTML which creates a button, that when clicked creates some questions in my page, works fine.
<input type="number" name="quantity" id="num_questions" min="1" max="99"><br>
<input type="button" name="go" id="go_button" value="Go" onclick="createQuestions()"><br>
但是,在函数createQuestions()
中,我已经在JavaScript中定义了一个变量,该变量基于从我的HTML代码输入的数字,如上所示.
However, within my function createQuestions()
I have defined a variable in JavaScript, which is based on a number input from my HTML code, shown above.
var number = document.getElementById('num_questions').value;
我还有另一个按钮,它调用一个单独的函数,但我需要该变量号是我在另一个函数中本地定义的.有什么办法可以获取该变量并在全局范围内使用它?我尝试在函数外定义它,但是由于onclick事件仅调用该函数,因此不会创建变量.
I have another button which calls a separate function but I need that variable number I locally defined in another function. Is there any way I can grab that variable and use it globally? I tried defining it outside my function, but since the onclick event only calls that one function, it won't create the variable.
其他按钮:
<input type="submit" name="submit" value="Create Tree" onclick="displayData()">
推荐答案
According to How to declare a global variable in a .js file you can define a variable before any function is called and then use it in different functions.
var global1 = "I'm a global!";
function setGlobal () {
global1= document.getElementById('num_questions').value;
}
function testGlobal () {
alert(global1);
}
这篇关于从不同的函数访问变量的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!