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Home  >  Article  >  Web Front-end  >  Several ways to use while loop to calculate and print the sum of even numbers from 2 to 100

Several ways to use while loop to calculate and print the sum of even numbers from 2 to 100

一个新手
一个新手Original
2017-09-21 09:40:134189browse

Use while loop to calculate and print the sum of even numbers from 2 to 100 (three methods)

1. Loop—while
Syntax: while (condition) {

//Loop body-loop operation//Update loop conditions++/--;

}

##2.continue
Function: Terminate the execution of this cycle and continue the next cycle

<p style="margin-bottom: 7px;"><!doctype html><br/><html lang="en"><br/> <head><br/>	 <meta charset="UTF-8"><br/>     <title>Document</title><br/>	 <link rel="stylesheet" style="text/css" href=""><br/>	 <style><br/><br/><br/>	 </style><br/> </head><br/> <body><br/>	 <script><br/>		计算打印2——100的偶数和<br/>	// 方法1：<br/>		function sumOs(){<br/>			var os=0;<br/>			var i=2;<br/>			while(i<=100){<br/>				os+=i;<br/>				i+=2;<br/>			}<br/>		console.log(os);<br/>		}<br/>		sumOs();<br/>	<br/>	//方法2：<br/>		function sumOs(){<br/>			var os=0;<br/>			var i=1;<br/>			while(i<=100){<br/>				if(i%2==0){<br/>					os+=i;<br/>				}<br/>			i++;<br/>			}<br/>		console.log(os);<br/>		}<br/>		sumOs();<br/>	<br/>	//方法3：<br/>		function sumOs(){<br/>			var os = 0;<br/>			var i = 1;<br/>			while(i<=100){<br/>					if(i%2==1){<br/>						i++;<br/>						continue;<br/>					}<br/>					os += i;<br/>					i++;<br/>				}<br/>				console.log(os);<br/>			}<br/>		sumOs();<br/><br/><br/>	//扩展：循环从弹窗中录入信息，并且打印，直到输入exit为止<br/>		function printMsg(){<br/>			while(true){<br/>				var msg=prompt("请输入一个字段啊");<br/>				if(msg=="exit"){<br/>					break;<br/>				}else{<br/>					console.log(msg);<br/>				}<br/>			}<br/>		}<br/>		printMsg();<br/>	</script><br/> </body><br/></html><br/></p>

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