错误提示：ErrorNotification.js:125 Cannot assign Ctrl-Shift-Down to io.emmet.decrement_number_by_1. It is already assigned to edit.lineDown<script type="text/javascript"> function count(){ var a1=parseInt(document.getElementById('txt1').value); var a2=parseInt(document.getElementById('txt2').value); var guize=document.getElementById('select').value; var result=0; switch(guize){ case '+': result=a1+a2; break; case '-': result=a1-a2; break; case '*': result=a1*a2; break; default: result=a1/a2; break; } document.getElementById('fruit').innerHTML=result.toString(); } </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>
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document.getElementById('fruit').innerHTML=result.toString();==>document.getElementById('fruit').value=result
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