代码
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title></title>
<style>
p {
margin: 0 auto;
height: 73px;
width: 660px;
background-color: seagreen;
text-align: center;
}
input {
outline: none;
height: 50px;
margin-top: 11px;
border: 0;
vertical-align: bottom;
}
button {
height: 52px;
width: 100px;
border: 0;
}
</style>
</head>
<body>
<!-- 输入两个数，计算2个数之间的整数之和 -->
<p>
<input type="text" name="" id="a" placeholder="请输入起始值">
~
<input type="text" name="" id="b" placeholder="请输入目标值">
<button onclick="js()">计算</button>
<input type="text" name="" id="c">
</p>
<script>
function js() {
let A = parseInt(a.value);
let B = parseInt(b.value);
let sum = 0;
if (A < B) {
for ( ; A <= B; A++) {
sum = sum + A;
document.getElementById("c").value = sum;
}
} else {
document.getElementById("c").value = "参数错误";
}
}
</script>
</body>
</html>
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