<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>无标题文档</title>
</head>
<script type="text/javascript">
var a = doucment.getElementById("text1").value;
a = Number(a);
var b = doucment.getElementById("text2").value;
a = Number(b);
var c;
function showsum(){
c = a + b;
return c;
}
function showless(){
c = a - b;
return c;
}
function showsmul(){
c = a * b;
return c;
}
function showdiv(){
c = a / b;
return c;
}
</script>
<style>
p{
text-align:center;
font-family:"华文行楷";
font-size:30px;
}
</style>
<body>
<p>
购物简易计算器
</p>
<form method="post" action=" ">
第一个数：
<input type ="text" id="text1"/><br />
第二个数：<input type="text" id="text2"/><br />
<input type="button" id="button1" value="+" onclick="showsum()"/>
<input type="button" id="button2" value="-" onclick="showless()" />
<input type="button" id="button2" value="*" onclick="showmul()" />
<input type="button" id="button2" value="/" onclick="showdiv()" />
<br />
计算结果:<input type="text" id ="text3" value=c />
</form>
</body>
为什么下面计算结果的text得不到值啊。。。新人初来乍到。。。啥都不懂啊
var a = doucment.getElementById("text1").value; a = Number(a);
var b = doucment.getElementById("text2").value; a = Number(b);
你的a赋了两次值？
获取值的代码全部放到函数里面，要不你放dom前面对象没有生成报错了，就算放dom后面你这样也没有办法得到输入的值，而且也没有设置c的值。。
document也拼错，一堆问题
<script>
var c;
function showsum() {
var a = document.getElementById("text1").value;
a = Number(a);
var b = document.getElementById("text2").value;
b = Number(b);
document.getElementById('text3').value = a + b;
}
function showless() {
var a = document.getElementById("text1").value;
a = Number(a);
var b = document.getElementById("text2").value;
b = Number(b);
document.getElementById('text3').value = a - b;
}
function showmul() {
var a = document.getElementById("text1").value;
a = Number(a);
var b = document.getElementById("text2").value;
b= Number(b);
document.getElementById('text3').value = a * b;
}
function showdiv() {
var a = document.getElementById("text1").value;
a = Number(a);
var b = document.getElementById("text2").value;
b = Number(b);
document.getElementById('text3').value = a / b;
}
</script>
<style>
p {
text-align: center;
font-family: "华文行楷";
font-size: 30px;
}
</style>
<body>
<p>
购物简易计算器
</p>
<form method="post" action=" ">
第一个数：
<input type="text" id="text1" /><br />
第二个数：<input type="text" id="text2" /><br />
<input type="button" id="button1" value="+" onclick="showsum()" />
<input type="button" id="button2" value="-" onclick="showless()" />
<input type="button" id="button2" value="*" onclick="showmul()" />
<input type="button" id="button2" value="/" onclick="showdiv()" />
<br />
计算结果:<input type="text" id="text3" value=c />
</form>
</body>
var b = doucment.getElementById("text2").value; a = Number(b);