CoffeeScript - 比较运算符
JavaScript 支持以下比较运算符。 假设变量A 的值为10，变量B 的值为20，则 −
| Sr.No | 运算符和说明 | 示例 |
|---|---|---|
| 1 | = = （等于） 检查两个操作数的值是否相等，如果相等，则条件成立。 |
(A == B) is not true. |
| 2 | != （不等于） 检查两个操作数的值是否相等，如果值不相等，则条件为真。 |
(A != B) is true. |
| 3 | > （大于） 检查左操作数的值是否大于右操作数的值，如果是，则条件成立。 |
(A > B) is not true. |
| 4 | < （小于） 检查左操作数的值是否小于右操作数的值，如果是，则条件成立。 |
(A < B) is true. |
| 5 | >= （大于或等于） 检查左操作数的值是否大于或等于右操作数的值，如果是，则条件成立。 |
(A >= B) is not true. |
| 6 | <= （小于或等于） 检查左操作数的值是否小于或等于右操作数的值，如果是，则条件成立。 |
(A <= B) is true. |
示例
以下代码展示了如何在 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
打开命令提示符并编译 comparison_example.coffee 文件，如下所示。
c:/> coffee -c comparison_example.coffee
在编译时，它会提供以下 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，再次打开命令提示符 并运行 CoffeeScript 文件，如下所示。
c:/> coffee comparison_example.coffee
执行时，CoffeeScript 文件产生以下输出。
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
