javascript實現運算器例項
阿新 • • 發佈:2018-11-09
運算器.html
<!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" xml:lang="en"> <head> <meta http-equiv="Content-Type" content="text/html;charset=UTF-8"> <title>計算器</title> </head> <body> <input type="text" id="num1"/> <input type="text" id="opt"/> <input type="text" id="num2"/>= <input type="text" id="result"/> <input type="button" id="comp" value="運算" /> <script type="text/javascript"> var comp = document.getElementById("comp"); comp.onclick = function(){ var num1= Number(document.getElementById("num1").value); var num2 = Number(document.getElementById("num2").value); var opt = document.getElementById("opt").value; var result; switch(opt){ case "+": result = num1 + num2; break; case "-": result = num1 - num2; break; case "*": result = num1 * num2; break; case "/": result = num1 / num2; break; } document.getElementById("result").value=result; } </script> </body> </html>