qq_小白_7
2015-06-22 08:58
<!DOCTYPE html> <html> <head> <title> 事件</title> <script type="text/javascript"> function count(){ var a=document.getElementById("txt1").value var b=document.getElementById("txt2").value var c=document.getElementById("select").value var result; switch(select) {case "+":result=a+b;break; case "-":result=a-b;break; case "*":result=a*b;break; case "/":result=a/b;break; document.getElementById("fruit").value=result;} } </script> </head> <body> <input type='text' id='txt1' /> <select id='select'> <option value='+'>+</option> <option value="-">-</option> <option value="*">*</option> <option value="/">/</option> </select> <input type='text' id='txt2' > <input type='button' value=' = ' onclick="count()"> <input type='text' id='fruit' > </body> </html>
function count(){ var a=document.getElementById("txt1").value*1; var b=document.getElementById("txt2").value*1; var c=document.getElementById("select").value; var result; switch(c){ case "+":result=a+b;break; case "-":result=a-b;break; case "*":result=a*b;break; case "/":result=a/b;break; } document.getElementById("fruit").value=result; }
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