我的代碼哪里有錯(cuò)，同學(xué)們幫我找找吧
<!DOCTYPE html>
<html>
?<head>
? <title> 事件</title> ?
? <script type="text/javascript">
? ?function count(){
var ? ?var1=document.getElementById("txt1").value;
var ? ?var2=document.getElementById("txt2").value;
var ? ?sign=document.getElementById("select").value;
var ?fruit;
switch(sign)
{
? ? +:fruit=parseInt(var1)+parseInt(var2);break;
? ? -:fruit=parseInt(var1)-parseInt(var2);break;
? ? *:fruit=parseInt(var1)*parseInt(var2);break;
? ? /:fruit=parseInt(var1)/parseInt(var2);break;
}
document.getElementById("fruit").value=fruit;
} ??
? </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>
2016-08-22
case "+": fruit=parseInt(var1)+parseInt(var2);break;
? ? case "-": fruit = parseInt(var1) - parseInt(var2); break;
? ? case "*": fruit = parseInt(var1) * parseInt(var2); break;
? ? case "/": fruit = parseInt(var1) / parseInt(var2); break;
2022-03-29
我也這么想，而且就可以適配不同大小的屏幕了
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