TypeScript While 循环

while 循环会在指定条件为真时执行指令。换句话说，在代码块被执行之前，循环会先评估条件。

语法

while(condition) { 
   // statements if the condition is true 
}

流程图

示例：while循环

var num:number = 5; 
var factorial:number = 1; 

while(num >=1) { 
   factorial = factorial * num; 
   num--; 
} 
console.log("The factorial  is "+factorial);

上面的代码片段使用一个 while 循环来计算变量num中的值的阶乘。

编译后，它将生成以下JavaScript代码−

//Generated by typescript 1.8.10
var num = 5;
var factorial = 1;
while (num >= 1) {
   factorial = factorial * num;
   num--;
}
console.log("The factorial  is " + factorial);

它产生以下输出−

The factorial is 120