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| <!doctype html> | |
| <html> | |
| <head> | |
| <meta charset="utf-8"> | |
| <title>列印菱形</title> | |
| <script type="text/javascript"> | |
| var num = prompt("請輸入列印的行數："); | |
| for(var i=1;i<=num;i++)//決定輸出的行數 | |
| { | |
| for(var j=1;j<=num-i;j++)//決定每一行開頭的空格數 | |
| { | |
| document.write(" "); | |
| } | |
| for(var k=1;k<=2*i-1;k++)//決定每一行的*數 | |
| { | |
| document.write("*"); | |
| } | |
| document.write("</br>"); | |
| } | |
| <!--/*輸出菱形的下半部分*/--> | |
| for(var i=1;i<=num-1;i++)//決定輸出的行數 | |
| { | |
| for(var j=1;j<=i;j++)//決定每一行開頭的空格數 | |
| { | |
| document.write(" "); | |
| } | |
| for(var k=1;k<=2*num-1-2*i;k++)//決定每一行的*數 | |
| { | |
| document.write("*"); | |
| } | |
| document.write("</br>"); | |
| } | |
| </script> | |
| </head> | |
| <body> | |
| </body> | |
| </html> |
JavaScript 列印菱形 輸入列印行數 自動列印
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