看了好久没看出来问题，又不想用parseInt ，求大神赐教！
<!DOCTYPE html>
<html>
<head>
<title> 事件</title>
<script type="text/javascript">
function count(){
var x=document.getElementById("txt1");
var y=document.getElementById("txt2");
switch(select){
case "+": sum=x+y;break;
case "-": sum=x-y;break;
case "*": sum=x*y;break;
case "/": sum=x/y;break;
default : sum="default"; break;
}
}
ducument.getElementById("fruit").value = sum;
</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>
wangjioho4回答
-
qq_位卑未敢忘忧国_0
<!DOCTYPE html><html><head> <title></title></head><body> <input type='text' name="txt1" id='txt1'/> <select id='select'> <option value='+'>+</option> <option value="-">-</option> <option value="*">*</option> <option value="/">/</option> </select> <input type='text' name="txt2" id='txt2'/> <input type='button' name="but" value='=' onclick="s()"/> <input type='text' name="te" id='fruit' value=""/></body></html><script type="text/javascript"> function s(){ var sum = document.getElementById("fruit"); var x = document.getElementById("txt1").value; var y = document.getElementById("txt2").value; var he =x*1+y*1; var cha =x*1-y*1;//减 var ji =x*y*1;//乘 var chu = x/y*1;//除 var select=document.getElementById("select").value; switch(select){ case "+": sum.value=he; break; case "-": sum.value=cha;break; case "*": sum.value=ji; break; case "/": sum.value=chu;break; default : sum.value="default"; } }</script>修改 了 下 复制 看看 -
qq_轉裑灬巳陌_0
<!DOCTYPE html> <html> <head> <title> 事件</title> <script type="text/javascript"> function count(){ var sum=0; var x=parseInt(document.getElementById("txt1").value); var y=parseInt(document.getElementById("txt2").value); var select=document.getElementById("select").value; switch(select){ case "+": sum=x+y;break; case "-": sum=x-y;break; case "*": sum=x*y;break; case "/": sum=x/y;break; default : sum="default"; break; } document.getElementById("fruit").value = sum; } </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> -
Caballarii
switch(select){//select呢？document.getElementById("select")去哪儿了？ducument.getElementById("fruit").value = sum;这句怎么到了函数外面？document也拼错了
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