Javascript |倒数

Question

如果我有一个变量 8589934592

示例:

  var a = (8589934592 | 0);
  //a is 0

  var b = (8589934591223 | 0);
  //b is -777

  var c = (85899345999 | 0) 
  //c is 79

  var d = (858993459 | 0);
  //d is 858993459

据我了解，d是正确的，但如果我尝试大于858993459

的数字

但如果我有:例如

  var a = (2147483647 | 0) 
  //a is 2147483647

  var b = (2147483648 | 0) 
  //b is -2147483648

  var c = (2147483649 | 0) 
  //c is -2147483647

我认为这就像一个负数倒计时，我该如何避免这种情况？

Answer 1

您正在执行按位运算(简单 |: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Bitwise_Operators#Bitwise_OR )

因此，这是使用 32 位有符号 int 完成的。

也许您想将其加倍以使用二元逻辑运算符 ( https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Logical_Operators#Logical_OR )