Show 例子 2

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2023-12-01

JavaScript支持以下比较运算符。 假设变量A保持10 ,变量B保持20 ,则 -

Sr.No运算符和描述
1

= = (Equal)

检查两个操作数的值是否相等,如果是,则条件成立。

(A == B)不是真的。
2

!= (Not Equal)

检查两个操作数的值是否相等,如果值不相等,则条件变为true。

(A!= B)是真的。
3

》 (Greater than)

检查左操作数的值是否大于右操作数的值,如果是,则条件变为真。

(A> B)不是真的。
4

《 (Less than)

检查左操作数的值是否小于右操作数的值,如果是,则条件变为真。

(A < B) 为真
5

》= (Greater than or Equal to)

检查左操作数的值是否大于或等于右操作数的值,如果是,则条件变为真。

(A> = B)不是真的。
6

《= (Less than or Equal to)

检查左操作数的值是否小于或等于右操作数的值,如果是,则条件变为真。

(A <= B)是真的。

例子 (Example)

以下代码显示了如何在CoffeeScript中使用比较运算符。 将此代码保存在名为comparison_example.coffee的文件中

a = 10
b = 20
console.log "The result of (a == b) is "
result = a == b
console.log result
console.log "The result of (a < b) is "
result = a < b
console.log result
console.log "The result of (a > b) is "
result = a > b
console.log result
console.log "The result of (a != b) is "
result = a != b
console.log result
console.log "The result of (a >= b) is "
result = a <= b
console.log result
console.log "The result of (a <= b) is "
result = a >= b
console.log result

打开command prompt并编译comparison_example.coffee文件,如下所示。

c:/> coffee -c comparison_example.coffee

在编译时,它为您提供以下JavaScript。

// Generated by CoffeeScript 1.10.0
(function() {
  var a, b, result;
  a = 10;
  b = 20;
  console.log("The result of (a == b) is ");
  result = a === b;
  console.log(result);
  console.log("The result of (a < b) is ");
  result = a < b;
  console.log(result);
  console.log("The result of (a > b) is ");
  result = a > b;
  console.log(result);
  console.log("The result of (a != b) is ");
  result = a !== b;
  console.log(result);
  console.log("The result of (a >= b) is ");
  result = a <= b;
  console.log(result);
  console.log("The result of (a <= b) is ");
  result = a >= b;
  console.log(result);
}).call(this);

现在,再次打开command prompt并运行CoffeeScript文件,如下所示。

c:/> coffee comparison_example.coffee

执行时,CoffeeScript文件生成以下输出。

The result of (a == b) is
false
The result of (a < b) is
true
The result of (a > b) is
false
The result of (a != b) is
true
The result of (a >= b) is
true
The result of (a <= b) is
false