使用简单的html和原生的Javascript进行加减乘除运算
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>IFE ECMAScript</title>
</head>
<body>
<input id="first_number" type="number" placeholder="第一个数字">
<input id="second_number" type="number" placeholder="第二个数字">
<button id="add-btn">加</button>
<button id="minus-btn">减</button>
<button id="times-btn">乘</button>
<button id="divide-btn">除法</button>
<p id="result">运算结果</p>
<script>
var x = document.getElementById("first_number");
var y = document.getElementById("second_number");
document.getElementById("add-btn").onclick = function() {
document.getElementById("result").innerHTML = parseFloat(x.value) + parseFloat(y.value);
},
document.getElementById("minus