<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>函数return关键字</title>
<script type="text/javascript">
window.onload = function(){
var input01 = document.getElementById('input01');
var input02 = document.getElementById('input02');
var btn = document.getEIementById('btn');
//input01.value = 10;
//input02.value = 5;
btn.onclick = function(){
var val01 = input01.value;
var val02 = input02.value;
//console.log(val01)
var rs = add(val01,val02);
alert(rs)
}
function add(a,b){
var c = parseInt(a) + parseInt(b);
return c;//返回值
// return ;结束函数
}
}
</script>
</head>
<body>
<input type="text" name="id= input01 ">
<input type="text" name="id =input02">
<input type="button" name="" value="相加" id = 'btn'>
</body>
</html>
