<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>菜鸟教程(runoob.com)</title> </head> <body> <p>点击按钮计算 x 的值.</p> <button onclick="myFunction()">点击这里</button> <p id="demo"></p> <script> function myFunction() { y=5; z=2; x=y+z; document.getElementById("demo").innerHTML=x; } </script> </body> </html>
<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>菜鸟教程(runoob.com)</title> </head> <body> <p>假设 y=5，计算 x=y+2，并显示结果。</p> <button onclick="myFunction()">点击这里</button> <p id="demo"></p> <script> function myFunction(){ var y=5; var x=y+2; var demoP=document.getElementById("demo"); demoP.innerHTML="x=" + x; } </script> </body> </html>
<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>菜鸟教程(runoob.com)</title> </head> <body> <p>设置 y=5, 计算出 x=y-2, 并输出结果。</p> <button onclick="myFunction()">点我</button> <p id="demo"></p> <script> function myFunction() { var y=5; var x=y-2; var demoP=document.getElementById("demo"); demoP.innerHTML="x=" + x; } </script> </body> </html>
<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>菜鸟教程(runoob.com)</title> </head> <body> <p>设置 y=5, 计算出 x=y*2, 并输出结果。</p> <button onclick="myFunction()">点我</button> <p id="demo"></p> <script> function myFunction() { var y=5; var x=y*2; var demoP=document.getElementById("demo") demoP.innerHTML="x=" + x; } </script> </body> </html>
<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>菜鸟教程(runoob.com)</title> </head> <body> <p>设置 y=5, 计算 x=y/2, 并输出结果。</p> <button onclick="myFunction()">点我</button> <p id="demo"></p> <script> function myFunction() { var y=5; var x=y/2; var demoP=document.getElementById("demo") demoP.innerHTML="x=" + x; } </script> </body> </html>
<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>菜鸟教程(runoob.com)</title> </head> <body> <p>设置 y=5, 计算出 x=y%2, 并显示结果。</p> <button onclick="myFunction()">点我</button> <p id="demo"></p> <script> function myFunction() { var y=5; var x=y%2; var demoP=document.getElementById("demo") demoP.innerHTML="x=" + x; } </script> </body> </html>
<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>菜鸟教程(runoob.com)</title> </head> <body> <p>设置 y=5, 计算出 x=++y, 并显示结果。</p> <button onclick="myFunction()">点我</button> <p id="demo"></p> <script> function myFunction() { var y=5; var x=++y; var demoP=document.getElementById("demo") demoP.innerHTML="x=" + x + ", y=" + y; } </script> <p><strong>注意:</strong>两个值 x 和 y 都受到影响。</p> </body> </html>
<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>菜鸟教程(runoob.com)</title> </head> <body> <p>设置 y=5, 计算出 x=--y, 并显示结果。</p> <button onclick="myFunction()">点我</button> <p id="demo"></p> <script> function myFunction() { var y=5; var x=--y; var demoP=document.getElementById("demo") demoP.innerHTML="x=" + x + ", y=" + y; } </script> <p><strong>注意:</strong> x 和 y 两个值都会被影响。</p> </body> </html>
<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>菜鸟教程(runoob.com)</title> </head> <body> <p>设置 x=10 和 y=5, 计算 x=y, 并显示结果。</p> <button onclick="myFunction()">点我</button> <p id="demo"></p> <script> function myFunction() { var x=10; var y=5; x=y; var demoP=document.getElementById("demo") demoP.innerHTML="x=" + x; } </script> </body> </html>
<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>菜鸟教程(runoob.com)</title> </head> <body> <p>设置 x=10 和 y=5, 计算 x+=y, 并显示结果。</p> <button onclick="myFunction()">点我</button> <p id="demo"></p> <script> function myFunction() { var x=10; var y=5; x+=y; var demoP=document.getElementById("demo") demoP.innerHTML="x=" + x; } </script> </body> </html>
<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>菜鸟教程(runoob.com)</title> </head> <body> <p>设置 x=10 和 y=5, 计算 x-=y, 并显示结果。</p> <button onclick="myFunction()">点我</button> <p id="demo"></p> <script> function myFunction() { var x=10; var y=5; x-=y; var demoP=document.getElementById("demo") demoP.innerHTML="x=" + x; } </script> </body> </html>
<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>菜鸟教程(runoob.com)</title> </head> <body> <p>设置 x=10 和 y=5, 计算 x*=y, 并显示结果。</p> <button onclick="myFunction()">点我</button> <p id="demo"></p> <script> function myFunction() { var x=10; var y=5; x*=y; var demoP=document.getElementById("demo") demoP.innerHTML="x=" + x; } </script> </body> </html>
<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>菜鸟教程(runoob.com)</title> </head> <body> <p>设置 x=10 和 y=5, 计算 x/=y, 并显示结果。</p> <button onclick="myFunction()">点我</button> <p id="demo"></p> <script> function myFunction() { var x=10; var y=5; x/=y; var demoP=document.getElementById("demo"); demoP.innerHTML="x=" + x; } </script> </body> </html>
<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>菜鸟教程(runoob.com)</title> </head> <body> <p>设置 x=10 和 y=5, 计算 x%=y, 并显示结果。</p> <button onclick="myFunction()">点我</button> <p id="demo"></p> <script> function myFunction() { var x=10; var y=5; x%=y; var demoP=document.getElementById("demo") demoP.innerHTML="x=" + x; } </script> </body> </html>
<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>菜鸟教程(runoob.com)</title> </head> <body> <p>点击按钮创建及增加字符串变量。</p> <button onclick="myFunction()">点击这里</button> <p id="demo"></p> <script> function myFunction() { txt1="What a very"; txt2="nice day"; txt3=txt1+txt2; document.getElementById("demo").innerHTML=txt3; } </script> </body> </html>
<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>菜鸟教程(runoob.com)</title> </head> <body> <p>点击按钮创建及增加字符串变量。</p> <button onclick="myFunction()">点击这里</button> <p id="demo"></p> <script> function myFunction() { var x=5+5; var y="5"+5; var z="Hello"+5; var demoP=document.getElementById("demo"); demoP.innerHTML=x + "<br>" + y + "<br>" + z; } </script> </body> </html>
