javascript - 用函数修改全局变量？

Question

在 mousePressed 中，我需要 aNumber 的值，但我无法传递 mousePressed(int aNumber).. 因此，当通过 javascript 调用 theNumbers 时，我需要某种全局变量来保持修改状态..

int number = 0;
int theNumbers(int aNumber) { //aNumber = 1, 2, or 3, from the javascript)

  println(number); // prints the correct number
  int number = aNumber; // set the global variable number equal to aNumber 
  return number;
}

void mousePressed() {
  aLongNumber = 10000000000;

  println(number); // prints 0 right now, should print the value of aNumber
  long numberLong = aLongNumber + (number * aLongNumber);
}

Answer 1

您要在 theNumbers() 中声明局部变量，只需删除 number 之前的 int 即可，这样您的函数将如下所示:

int theNumbers(int aNumber) { //aNumber = 1, 2, or 3, from the javascript)

  println(number);
  number = aNumber; // removed int that made new local variable "number"
  return number;
}