Javascript 的全局变量 (Acrobat Reader)
我有一个 PDF 表单，我试图在文档级 Javascript 编辑器中声明一个全局变量...我正在使用
global.myVariable = "0";
，然后在表单中的一个字段上运行代码：
if(myVariable == "0"){
app.alert("Hello!");
myVariable = "1";
}
这样它只会带来提高警报一次。然而，每次我在任何领域输入任何内容时，它都会出现，这很烦人。请指教！
I have a PDF form and I'm trying to declare a global variable in the Document-level Javascript editor... I'm using
global.myVariable = "0";
and then on a field in the form, I'm running the code:
if(myVariable == "0"){
app.alert("Hello!");
myVariable = "1";
}
So that it only brings up the alert once. However, it's bringing it up every time I enter anything into any field, which is annoying. Please advise!
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您可以通过执行以下操作在任何地方声明全局变量：
myVariable = 1;
但是，如果您在最顶层范围中声明变量，则是最安全的：
var myVariable = 1;
您必须记住的唯一问题是确保您不会在其他任何地方覆盖
myVariable。You can declare a global variable anywhere by doing:
myVariable = 1;
However it's safest if you declare your variable in the top-most scope:
var myVariable = 1;
The only issue you have to remember is to make sure you don't override
myVariableanywhere else.如果将变量声明为 global.myVariable，则需要将 if 语句编写为：
if you declare the variable as global.myVariable you will need to write your if-statement as: