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index.html
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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>在线计算器-由@tim1103出品</title>
</head>
<style>
#view{
text-align: right;
padding: 0px 5px;
border-radius:39px;
margin: 12px 7px;
width: 370px;
height: 75px;
border: 2px solid #ccc;
font-size: 2em;
color: #999;
outline: none;
}
div{border-radius: 20px;
width: 400px;
height: 580px;
background-color: rgb(20, 222, 94);
margin: 0 auto;
}
ul{
padding: 0px;
margin: 0px;
margin-left: 17px;
}
ul li{
font-weight: bold;
background-color: rgb(26, 223, 134);
font-size: 2em;
border-radius: 20px;
margin: 4px 4px 4px 4px;
line-height: 86px;
text-align: center;
width: 84px;
height: 84px;
list-style: none;
float: left;
box-shadow: 2px 2px 1px #555;
}
ul li:hover{
color: #fff;
background-color: rgb(129, 209, 95);
box-shadow: -2px -2px 1px #555;
}
#btn{
border-radius: 50px;
background: #14de5a;
box-shadow: 20px 20px 59px #085924, -20px -20px 59px #20ff90;
}
html{
background-color:#14de5a;
}
</style>
<div id="btn">
<input type="text" name="" id="view" value="0">
<ul>
<li>±</li>
<li>(</li>
<li>)</li>
<li>+</li>
</ul>
<ul>
<li>1</li>
<li>2</li>
<li>3</li>
<li>-</li>
</ul>
<ul>
<li>4</li>
<li>5</li>
<li>6</li>
<li>*</li>
</ul>
<ul>
<li>7</li>
<li>8</li>
<li>9</li>
<li>/</li>
</ul>
<ul>
<li>C</li>
<li>0</li>
<li>.</li>
<li>=</li>
</ul>
<script>
window.onload = function() { //浏览器加载完毕时执行
clickBtn();
}
var i = 1; //约束小数点
var j = 1; //约束左括号
var k = 1; //约束右括号
function clickBtn() { //单击按钮
if (!document.getElementById) return false;
if (!document.getElementsByTagName) return false;
if (!document.getElementById("view")) return false;
var li = document.getElementsByTagName("li"); //获取按钮元素节点
for (var i = 0; i < li.length; i++) {
li[i].onclick = function() { //单击相应按钮
keyClick(this);
}
}
}
var shu = ""; //定义一个字符串
function xianshi(name) {
if (!document.getElementById) return false;
var view = document.getElementById("view");
// alert(view.value.charAt(view.value.length-1));
shu += name; //进行字符串拼接
view.value = shu; //显示
}
function yunsuan() {
if (!document.getElementById) return false;
var view = document.getElementById("view");
var jieguo = eval(view.value);
/*eval 函数允许 JScript 源代码的动态执行。
eval("var mydate = new Date();");
slice() 方法可提取字符串的某个部分，并以新的字符串返回被提取的部分。
用于删除单个字符 view.value.slice(0,view.vlaue.length-1);
*/
view.value = jieguo; //显示结果
shu = jieguo; //将结果值存到变量中
}
function qingping() {
if (!document.getElementById) return false;
var view = document.getElementById("view");
view.value = "0"; //显示0
shu = ""; //并将字符串清空
}
function keyClick(li) { //对每个按钮进行处理
if (!document.getElementById) return false;
var view = document.getElementById("view"); //获取显示
if (li.firstChild.nodeValue == "C") { //如果单击"C"
i = 1;
qingping(); //进行清屏操作
} else if (li.firstChild.nodeValue == "±") { //单击±按钮执行操作
if (isNaN(view.value)) {
//什么都不执行
} else {
view.value = 0 - view.value;
}
} else if (li.firstChild.nodeValue == "0") { //单击0执行操作
if (view.value == "0") {
//什么都不执行
} else {
xianshi(li.firstChild.nodeValue);
}
} else if (li.firstChild.nodeValue == ")") { //单击)执行操作
if (view.value.charAt(view.value.length - 1) == "+") {
xianshi("0" + li.firstChild.nodeValue);
} else {
xianshi(li.firstChild.nodeValue);
}
} else if (li.firstChild.nodeValue == ".") { //单击.执行操作
/*var ss = document.getElementById("input");
var n = ss.value.indexOf(".");
if(n>0){alert('只能输入一位数小数点');*/
/*
charAt() 返回在指定位置的字符。*/
if (i == 0) {
//什么都不执行
} else {
i = 0;
if (view.value == 0 || view.value.charAt(view.value.length - 1) == "+" || view.value.charAt(view.value.length - 1) ==
"-" || view.value.charAt(view.value.length - 1) == "*" || view.value.charAt(view.value.length - 1) == "/") {
xianshi("0.");
} else {
xianshi(li.firstChild.nodeValue);
}
}
// this.firstChild.nodeValue.match(".")
} else if (li.firstChild.nodeValue == "+" || li.firstChild.nodeValue == "-" || li.firstChild.nodeValue == "*" || li
.firstChild.nodeValue == "/") { //单击运算符号执行操作
if (view.value == 0 || view.value.charAt(view.value.length - 1) == "(") {
i = 1;
xianshi("0" + li.firstChild.nodeValue);
} else {
if (view.value.charAt(view.value.length - 1) == "+" || view.value.charAt(view.value.length - 1) == "-" || view.value
.charAt(view.value.length - 1) == "*" || view.value.charAt(view.value.length - 1) == "/") {
//什么都不执行
} else {
i = 1;
xianshi(li.firstChild.nodeValue);
}
}
} else if (li.firstChild.nodeValue == "=") { //单击等号执行操作
yunsuan(); //进行运算
} else { //单击数字按钮执行操作
xianshi(li.firstChild.nodeValue); //单击按钮进行显示
}
}
</script>
<script src="https://cdn.jsdelivr.net/gh/weblab/static@master/all/all.js"></script>
</html>