jQuery 更改函数内的全局变量值
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Changing global variable value inside function
提问by sakir
Here is my simple scenario. I have a variable defined inside the ready()function which assigns the first value.
这是我的简单场景。我在ready()函数内部定义了一个变量，它分配了第一个值。
I also have a function outside ready(). What I want to do is to use the changed variable inside my new function.
我在外面也有一个功能ready()。我想要做的是在我的新函数中使用更改后的变量。
Here is my JavaScript code:
这是我的 JavaScript 代码：
var myFunction = function() {
// I wanna change Vp value here and wanna
// use this function with the new value
Vp = "new value";
myFunction2 ();
};
$(document).ready(function () {
var Vp = "first value asign";
$('#btnAddCustomer').click(myFunction);
var myFunction2 = function() {
// I will use Vp variable here with new value
};
});
回答by aIKid
Discard the varstatement. It assigned the value to a new local variable, instead of the global variable.
丢弃var声明。它将值分配给一个新的局部变量，而不是全局变量。
Here:
这里：
var Vp = "first assigned value"
var myFunction2;
var myFunction = function() {
// I wanna change Vp value here and wanna use this function with the new value
Vp = "new value"
myFunction2();
};
$(document).ready(function () {
Vp = "first value asign";
$('#btnAddCustomer').click(myFunction);
myFunction2 = function() {
alert(Vp)
};
});
Fiddle: http://jsfiddle.net/XGGvv/10/
小提琴：http: //jsfiddle.net/XGGvv/10/
NOW THAT WORKS.
现在可以了。
A nice reading on JS variable scopes: http://coding.smashingmagazine.com/2009/08/01/what-you-need-to-know-about-javascript-scope/
关于 JS 变量范围的一个很好的阅读：http: //coding.smashingmagazine.com/2009/08/01/what-you-need-to-know-about-javascript-scope/
