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[Java教程]js实现网页的两个input标签内的数值加减

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
<script>
window.onload=function(){

var oIput1=document.getElementById('put1');
var oIput2=document.getElementById('put2');
var nAdd=document.getElementById('add');
var nSub=document.getElementById('subtraction');


nAdd.onclick=function(){
var a=Number(oIput1.value);
var b=Number(oIput2.value);
c = a+b;
alert(c);
}
nSub.onclick=function(){
var a=Number(oIput1.value);
var b=Number(oIput2.value);
c = a-b;
alert(c);
}
}

</script>
</head>
<body>

数值1:<input id="put1" type="text" value=""/>
数值2:<input id="put2" type="text" value=""/>
<input type="button" id="add" value="求和" />
<input type="button" id="subtraction" value="相减" />

</body>
</html>

下面是效果图 ↓