Javascript 将局部变量从一个函数传递到另一个函数
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Passing a local variable from one function to another
提问by user1393266
I am a beginner in JavaScript and wanted to ask the following: I have two simple functions and was wondering if there is any way to pass a variable value from one function to another. I know I can just move it outside the function to be used in other functions as well but just need to know the way how I can have one local variable and manipulate with it in my second function. Is this possible and how?
我是 JavaScript 的初学者，想问以下问题：我有两个简单的函数，想知道是否有任何方法可以将变量值从一个函数传递到另一个函数。我知道我可以将它移到函数之外以用于其他函数，但只需要知道如何拥有一个局部变量并在我的第二个函数中使用它。这是可能的吗？
Here is some code:
这是一些代码：
window.onload = function show(){
var x = 3;
}
function trig(){
alert(x);
}
trig();
The question is: how do I access variable x(declared in the function show) from my second function trig?
问题是：如何从我的第二个函数访问变量x（在函数中声明show）trig？
回答by Pranay Rana
First way is
第一种方式是
function function1()
{
var variable1=12;
function2(variable1);
}
function function2(val)
{
var variableOfFunction1 = val;
// Then you will have to use this function for the variable1 so it doesn't really help much unless that's what you want to do. }
// 然后你将不得不对变量 1 使用这个函数，所以它并没有多大帮助，除非这是你想要做的。}
Second way is
第二种方式是
var globalVariable;
function function1()
{
globalVariable=12;
function2();
}
function function2()
{
var local = globalVariable;
}
回答by Asim Mahar
Adding to @pranay-rana's list:
添加到@pranay-rana 的列表中：
Third way is:
第三种方式是：
function passFromValue(){
var x = 15;
return x;
}
function passToValue() {
var y = passFromValue();
console.log(y);//15
}
passToValue();
回答by Ankit Jain
You can very easily use this to re-use the value of the variable in another function.
您可以非常轻松地使用它在另一个函数中重用变量的值。
// Use this in source window.var1= oEvent.getSource().getBindingContext();
// 在源代码中使用 window.var1= oEvent.getSource().getBindingContext();
// Get value of var1 in destination var var2= window.var1;
// 获取目标中 var1 的值 var var2= window.var1;
