qq_Sweet_Bean_0
2015-02-10 18:20
<input type='button' value=' = ' onlick=count() /> <!--通过 = 按钮来调用创建的函数,得到结果-->
<input type='text' id='fruit' />
</body>
</html>
下面是我的代码,我查看了无数遍都不知道是哪儿错了
<!DOCTYPE html>
<html>
<head>
<title> 事件</title>
<script type="text/javascript">
function count(){
var num1= document.getElementById("txt1").value;
var num2= document.getElementById("txt2")).value;
var way=document.getElementById("select").value;
var res="";
switch(way){
case"+":
res=parseInt(num1)+parseInt(num2);
break;
case"-":
res=parseInt(num1)-parseInt(num2);
break;
case"*":
res=parseInt(num1)*parseInt(num2);
break;
default:
res=parseInt(num1)/parseInt(num2);
}
document.getElementById("fruit").value=res;
}
</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' />
我想问一下res=parseInt(num1)+parseInt(num2); 里parseInt是什么意思?不能直接res=num1+num2吗?
<!DOCTYPE html>
<html>
<head>
<title> 事件</title>
<script type="text/javascript">
function count(){
var num1= document.getElementById("txt1").value;
var num2= document.getElementById("txt2").value;
var way=document.getElementById("select").value;
var res=0;
switch(way){
case"+":
res=parseInt(num1)+parseInt(num2);
break;
case"-":
res=parseInt(num1)-parseInt(num2);
break;
case"*":
res=parseInt(num1)*parseInt(num2);
break;
default:
res=parseInt(num1)/parseInt(num2);
break;
}
document.getElementById("fruit").value=res;
}
</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(txt1.value,txt2.value);' /> <!--通过 = 按钮来调用创建的函数,得到结果-->
<input type='text' id='fruit' />
</body>
</html>
<input type='button' value=' = ' onlick=count() />
应该是 onclick="count();"
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