代码错误了
<!DOCTYPE html> <html> <head> <title> 事件</title> <script type="text/javascript"> function count(){ var txt1= document.getElementById("txt1").value; var txt2= document.getElementById("txt2").value; var select1= document.getElementById("select").value; var result=""; switch(select1) { case "+": result=parseFloat(txt1) + parseFloat(txt2); break; case "-": result=parseFloat(txt1) - parseFloat(txt2); break; case "*": result=parseFloat(txt1) * parseFloat(txt2); break; case "/": result=parseFloat(txt1) / parseFloat(txt2); 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()/> <!--通过 = 按钮来调用创建的函数,得到结果--> <input type='text' id='fruit' /> </body> </html>
哪里错了,我找不到
还有代码错了要怎么调试,我不会