1.学习前端的第十二天
用时：一天
学习内容：js的基本语法
学习目标：基本完成
点对应加减乘除按钮的时候，将两个输入框中的数字做对应的算术，并将结果显示在id为result的p标签内。
<html>
<head>
<meta charset="UTF-8">
<title>IFE ECMAScript</title>
</head>
<body>
<input id="first-number" type="number" value="0" placeholder="第一个数字">
<input id="second-number" type="number" value="0" 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</button>
<p id="result">运算结果</p>
<script>
document.getElementById("add-btn").onclick = function(){
var result = parseFloat(document.getElementById("first-number").value) + parseFloat(document.getElementById("second-number").value);
document.getElementById("result").innerHTML = result;
}
document.getElementById("minus-btn").onclick = function()
{
var result = document.getElementById("first-number").value - document.getElementById("second-number").value;
document.getElementById("result").innerHTML = result;
}
document.getElementById("times-btn").onclick = function(){
var result = document.getElementById("first-number").value * document.getElementById("second-number").value;
document.getElementById("result").innerHTML = result;
}
document.getElementById("divide-btn").onclick = function()
{
var result = document.getElementById("first-number").value / document.getElementById("second-number").value;
document.getElementById("result").innerHTML = result;
}
</script>
</body>
</html>```原文：https://www.cnblogs.com/xing--/p/12739240.html