前端---js（自学笔记9）（嵌套练习）

朴灿烈づ我的快乐病毒、 2023-02-23 03:45 158阅读 0赞

# 嵌套练习： #

<!DOCTYPE html>
    <html>
    	<head>
    		<meta charset="UTF-8">
    		<title>嵌套练习</title>
    		
    		
    		
    		
    		
    		<script type="text/javascript">
    		
    			for(a=1;a<6;a++){
    			document.write("******<br />");
    		}
    			
    			for(i=0;i<6;i++){
    			 for(j=1;j<i+1;j++){
    			 	document.write("*");
    			 }
    			 document.write("<br />")
    		}
    			 document.write("<br />")0
    			
     			for(i=0;i<6;i++){
    			 for(j=1;j<6-i;j++){
    			 	document.write("*");
    			 }
    			 document.write("<br />")
    			
    		}
     			
    			//打印九九乘法表
    			
    		</script>
    		
    	</head>
    	<body>
    	</body>
    </html>

# 结果： #

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0FCVV9NT2xJX0lUVUk_size_16_color_FFFFFF_t_70][]

<!DOCTYPE html>
    <html>
    	<head>
    		<meta charset="UTF-8">
    		<title>qiantao1</title>
    		<script type="text/javascript">
    			//九九乘法表
    			for(i=1;i<9;i++){
    				for(j=1;j<=i;j++){
    					document.write("<span>"+j+"*"+i+"="+i*j+"</span>")
    				}
    				document.write("<br />")
    			}
    			
    		</script>
    		<style type="text/css">
    			
    			body{
    				width: 1000px
    			}
    			span{
    				display: inline-block;
    				width: 100px;
    			}
    		</style>
    	</head>
    	<body>
    	</body>
    </html>

# 结果： #

![20200704223500450.png][]

<!DOCTYPE html>
    <html>
    	<head>
    		<meta charset="UTF-8">
    		<title>质数练习</title>
    		<script type="text/javascript">
    			//判断是否为质数
    			var num = prompt("请输入数字：");
    			//首先判断这个值是否合法
    			if(num <= 1){
    				alert("不是合法数字");
    			}else{
    				var flag = true;
    			//获取2-num之间的数字
    				for(a=2;a<num;a++){
    					if(num%a ==0){
    						flag=false;
    					}
    				}
    				
    				console.log(flag);
    			}
    			if(flag){
    				alert(num+"是质数");
    			}
    		</script>
    	</head>
    	<body>
    	</body>
    </html>

![20200704224432642.gif][]

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0FCVV9NT2xJX0lUVUk_size_16_color_FFFFFF_t_70]: https://img-blog.csdnimg.cn/20200704214449772.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0FCVV9NT2xJX0lUVUk=,size_16,color_FFFFFF,t_70
[20200704223500450.png]: https://img-blog.csdnimg.cn/20200704223500450.png
[20200704224432642.gif]: https://img-blog.csdnimg.cn/20200704224432642.gif