TypeScript While循環(huán)

每次指定的條件求值為true時(shí)，while循環(huán)都會(huì)執(zhí)行指令。換句話說，循環(huán)在執(zhí)行代碼塊之前評(píng)估條件。

語法

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

流程圖

示例：while循環(huán)

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

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

上面的代碼片段使用while循環(huán)來計(jì)算變量num中值的階乘。

在編譯時(shí)，它將生成以下JavaScript代碼：

//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);

它產(chǎn)生以下輸出：

The factorial is 120