摘要： <!DOCTYPE html> <html> <head> <title>网页计算器</title> <script> function jia(){ var shu1; var&
<!DOCTYPE html>
<html>
<head>
<title>网页计算器</title>
<script>
function jia(){
var shu1;
var shu2;
var shu3;
var jeiguo;
var fuhao;
shu1=document.getElementById("text1").value;
shu2=document.getElementById("text2").value;
shu3=document.getElementById("text3");
fu=document.getElementById("fuhao").value;
shu1=parseFloat(shu1);
shu2=parseFloat(shu2);
if (fu =="+")
{ jieguo=shu1+shu2;
}
else if (fu=="-")
{
jieguo=shu1-shu2;
}
else if (fu=="*")
{
jieguo=shu1*shu2;
}
else if (fu=="/")
{
jieguo=shu1/shu2;
}
shu3.value=jieguo;
}
</script>
</head>
<body>
<input type="text" id="text1" value="">
<select id="fuhao">
<option value="+">+</option>
<option value="-">-</option>
<option value="*">*</option>
<option value="/">/</option>
</select>
<input type="text" id="text2" value="">
=
<input type="text" id="text3" value="">
<button type="submit" onclick="jia()">点击计算</button>
</body>
</html>
批改老师：天蓬老师批改时间：2018-11-01 22:55:36
老师总结：做为初学者,写出这样的代码很不错,最好给出数据类型错误的提示信息
