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2. 学习CoffeeScript
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CoffeeScript支持以下算术运算符。 假设变量A保持10 ，变量B保持20 ，则 -

Sr.No	运算符和描述	例
1	+ (Addition) 添加两个操作数	A + B = 30
2	− (Subtraction) 从第一个中减去第二个操作数	A - B = -10
3	* (Multiplication) 将两个操作数相乘	A * B = 200
4	/ (Division) 用分母除以分子	B/A = 2
5	% (Modulus) 输出整数除法的余数	B％A = 0
6	++ (Increment) 将整数值增加1	A ++ = 11
7	-- (Decrement) 将整数值减1	A-- = 9

例子 (Example)

以下示例显示如何在CoffeeScript中使用算术运算符。 将此代码保存在名为arithmetic_example.coffee的文件中

a = 33
b = 10
c = "test"
console.log "The value of a + b = is"
result = a + b
console.log result
result = a - b
console.log "The value of a - b = is "
console.log result
console.log "The value of a/b = is"
result = a/b
console.log result
console.log "The value of a % b = is"
result = a % b
console.log result
console.log "The value of a + b + c = is"
result = a + b + c
console.log result
a = ++a
console.log "The value of ++a = is"
result = ++a
console.log result
b = --b
console.log "The value of --b = is"
result = --b
console.log result

打开command prompt并编译.coffee文件，如下所示。

c:\> coffee -c arithmetic_example.coffee

在编译时，它为您提供以下JavaScript。

// Generated by CoffeeScript 1.10.0
(function() {
  var a, b, c, result;
  a = 33;
  b = 10;
  c = "test";
  console.log("The value of a + b = is");
  result = a + b;
  console.log(result);
  result = a - b;
  console.log("The value of a - b = is ");
  console.log(result);
  console.log("The value of a/b = is");
  result = a/b;
  console.log(result);
  console.log("The value of a % b = is");
  result = a % b;
  console.log(result);
  console.log("The value of a + b + c = is");
  result = a + b + c;
  console.log(result);
  a = ++a;
  console.log("The value of ++a = is");
  result = ++a;
  console.log(result);
  b = --b;
  console.log("The value of --b = is");
  result = --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 arithmetic_example.coffee

执行时，CoffeeScript文件生成以下输出。

The value of a + b = is
43
The value of a - b = is
23
The value of a/b = is
3.3
The value of a % b = is
3
The value of a + b + c = is
43test
The value of ++a = is
35
The value of --b = is
8