<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>菜鸟教程(runoob.com)</title> </head> <body> <p id="demo">单击按钮舍入与“2.5”最接近的整数</p> <button onclick="myFunction()">点我</button> <script> function myFunction(){ document.getElementById("demo").innerHTML=Math.round(2.5); } </script> </body> </html>
<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>菜鸟教程(runoob.com)</title> </head> <body> <p id="demo">点击按钮显示一个随机数</p> <button onclick="myFunction()">点我</button> <script> function myFunction(){ document.getElementById("demo").innerHTML=Math.random(); } </script> </body> </html>
<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>菜鸟教程(runoob.com)</title> </head> <body> <p id="demo">单击按钮返回5到10之间的最大值。</p> <button onclick="myFunction()">点我</button> <script> function myFunction(){ document.getElementById("demo").innerHTML=Math.max(5,10); } </script> </body> </html>
<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>菜鸟教程(runoob.com)</title> </head> <body> <p id="demo">单击按钮返回5到10之间最小的值。</p> <button onclick="myFunction()">点我</button> <script> function myFunction(){ document.getElementById("demo").innerHTML=Math.min(5,10); } </script> </body> </html>
