舍入
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=gb2312" /> <title>无标题文档</title> </head> <body> <p id="demo">舍入与“3.5”最接近的整数</p> <button οnclick="myFunction()">点我</button> <script> function myFunction(){ document.getElementById("demo").innerHTML=Math.round(3.5); } </script> </body> </html> 随机数 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=gb2312" /> <title>无标题文档</title> </head> <body> <p id="demo">显示一个随机数</p> <button οnclick="myFunction()">点我</button> <script> function myFunction(){ document.getElementById("demo").innerHTML=Math.random(); } </script> </body> </html> Max <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=gb2312" /> <title>无标题文档</title> </head> <body> <p id="demo">返回5到20之间的最大值。</p> <button οnclick="myFunction()">点我</button> <script> function myFunction(){ document.getElementById("demo").innerHTML=Math.max(5,20); } </script> </body> </html>
