本篇主要记录的是利用javscript实现一个网页计算器的效果，供大家参考，具体内容如下
话不多说，代码如下：
首先是html的代码：
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>利用js实现网页版计算器</title>
<link rel="stylesheet" href="cal.css" >
</head>
<body>
<div id="container" class="container">
<input id="result" class="result">
<div id="cal" class="clearfix">
<div id="num" class="fl">
<div id="top" class="clearfix">
<input id="clear" type="button" value="C">
<input id="antonyms" type="button" value="+/-">
<input id="remainder" type="button" value="%">
</div>
<div id="bonttom" class="clearfix">
<input type="button" value="7">
<input type="button" value="8">
<input type="button" value="9">
<input type="button" value="4">
<input type="button" value="5">
<input type="button" value="6">
<input type="button" value="1">
<input type="button" value="2">
<input type="button" value="3">
<input class="zero" type="button" value="0">
<input type="button" value=".">
</div>
</div>
<div id="math" class="fr math">
<input type="button" value="/" onclick="onclicknum('/')">
<input type="button" value="＊" onclick="onclicknum('*')">
<input type="button" value="＋" onclick="onclicknum('+')">
<input type="button" value="－" onclick="onclicknum('-')">
</div>
<input id="res" type="button" value="＝">
</div>
</div>
</body>
</html>接下来是css样式代码：
* {
margin: 0px;
padding: 0px;
}
.clearfix:before, .clearfix:after {
content: '';
display: block;
}
.clearfix:after {
clear: both;
}
.clearfix {
_zoom: 1;
}
input {
display: block;
}
.container {
width: 240px;
height: 400px;
border: 2px solid #eb4509;
margin: 100px auto;
}
.fl {
float: left;
}
.fr {
float: right;
}
input {
width: 60px;
height: 60px;
border: 1px solid #000;
float: left;
background: #ddd;
font-size: 24px;
color: #eb4509;
-webkit-box-sizing: border-box;
-moz-box-sizing: border-box;
box-sizing: border-box;
}
.math input {
float: none;
}
input.zero {
width: 120px;
}
#num {
width: 180px;
}
#cal #math {
width: 60px;
}
.result {
width: 100%;
height: 100px;
line-height: 100px;
border: none;
background-color: #dfdfdf;
font-size: 30px;
float: none;
outline: none;
text-align: right;
padding-right: 20px;
-webkit-box-sizing: border-box;
-moz-box-sizing: border-box;
box-sizing: border-box;
}最后上js代码：
<script type="text/javascript">
var numresult;
var str;
var flag;
var bot = document.getElementById("bonttom");
var botInputs = bot.getElementsByTagName("input");
var clear = document.getElementById("clear");
var res = document.getElementById("res");
var math = document.getElementById("math");
var mathInputs = math.getElementsByTagName("input");
var antonymsBtn = document.getElementById("antonyms");
var remainderBtn = document.getElementById("remainder");
//点击数字以及加减乘除
imporIn(botInputs);
// imporIn(mathInputs);
function imporIn(eles) {
for (var i = 0; i < eles.length; i++) {
eles[i].onclick = function () {
onclicknum(this.value);
}
}
}
//点击清空c按钮
clear.onclick = function () {
onclickclear();
}
//点击＝号得到结果
res.onclick = function () {
onclickresult();
}
//点击＋／－
antonymsBtn.onclick = function () {
antonyms();
}
//点击％
remainderBtn.onclick = function () {
remainder();
}
function onclicknum(nums) {
if (flag) {
console.log("num=" + nums);
if (nums !== "/" && nums !== "+" && nums !== "-" && nums !== "*") {
str.value = "";
console.log("aa" + nums);
}
}
flag = false;
str = document.getElementById("result");
str.value = str.value + nums;
}
//清空
function onclickclear() {
str = document.getElementById("result");
str.value = "";
}
//得到结果
function onclickresult() {
str = document.getElementById("result");
numresult = eval(str.value);
str.value = numresult;
flag = true;
}
//正负数
function antonyms() {
str = document.getElementById("result");
str.value = -str.value;
}
//%
function remainder() {
str = document.getElementById("result");
str.value = str.value / 100;
}
</script>以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持编程网。
