简易计算器
作者：互联网
模仿window自带计数器
1.实现简单的加减乘除
<%@ page language="java" contentType="text/html; charset=utf-8"
pageEncoding="utf-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>点击版的计算机</title>
</head>
<body>
<form >
<input type="text" id="t1" style="width: 160px"></input><br>
<input type="text" id="zhang" style="width: 160px" value="0" disabled="disabled"></input><br><br>
<input type="button" value="归零" style="width: 80px" onclick="a(this.value)"></input>
<input type="button" value="退格" style="width: 80px" onclick="tuiGe()"></input><br><br>
<input name="i1" id="i1" type="button" value="1" onclick="z(this.value)"></input>
<input name="i2" id="i2" type="button" value="2" onclick="z(this.value)"></input>
<input name="i3" id="i3" type="button" value="3" onclick="z(this.value)"></input>
<input name="i10" id="i10" type="button" value="+" onclick="f(this.value)"></input><br><br>
<input name="i4" id="i4" type="button" value="4" onclick="z(this.value)"></input>
<input name="i5" id="i5" type="button" value="5" onclick="z(this.value)"></input>
<input name="i6" id="i6" type="button" value="6" onclick="z(this.value)"></input>
<input name="11" id="11" type="button" value="-" onclick="f(this.value)"></input><br><br>
<input name="i7" id="i7" type="button" value="7" onclick="z(this.value)"></input>
<input name="i8" id="i8" type="button" value="8" onclick="z(this.value)"></input>
<input name="i9" id="i9" type="button" value="9" onclick="z(this.value)"></input>
<input name="i12" id="i9" type="button" value="*" onclick="f(this.value)"></input><br><br>
<input name="i13" id="i13" type="button" value="0" onclick="z(this.value)"></input>
<input name="i14" id="i14" type="button" value="." onclick="dianHao(this.value)"></input>
<input name="i15" id="i15" type="button" value="=" onclick="h(this.value)"></input>
<input name="i16" id="i16" type="button" value="/" onclick="f(this.value)"></input><br><br>
<input type="button" value="关于" style="width: 80px" id="19" onclick="guanYu()"></input>
<input type="button" value="退出" style="width: 80px" onclick="window.close()" ></input><br><br>
</form>
<script type="text/javascript"> //变量
var k=0;
var dianhao=0;
var dh="=";
var temp1=0;
var temp2=0;
var fh="";
var fuhao=0;
var b=document.getElementById("t1")
var j=document.getElementById("zhang")
function guanYu(){ //关于
alert("零度工作室");
}
function dianHao(X){ //点号
if (dianhao==0) {
if (k==0) {
j.value="0.";
} else if(j.value=="除数不能为零" || j.value=="运算符出错"){
j.value="0.";
b.value="";
} else {
j.value=j.value+X;
}
k=1;
dianhao=1;
}
}//大if
function tuiGe(){ //退格
var temp=j.value;
if (j.value=="除数不能为零" || j.value=="运算符出错" ) {
j.value="0";
b.value="";
k=0;
} else {
j.value=temp.substring(0, temp.length-1);
}
}
function a(a) { //归零
k=0;
temp1=0;
temp2=0;
fh="";
b.value="";
j.value="0";
dh="=";
dianhao=0;
fuhao==0;
}
function z(n){ //0-9
var i=document.getElementById("i"+n);
if(k==0 && n==0){
}else if (k==0 && j.value!="0"){
j.value="";
j.value=n;
k=1;
}else if(k==0 && j.value!=""){
a(n);
j.value=n;
k=1;
} else {
j.value=j.value+n;
k=1;
}
}
function f(m){ //符号
if (m=="-" && fuhao==0 && k==0) {
j.value="-";
k=1;
} else {
run();
fh=m;
temp1=j.value;
k=0;
dianhao=0;
j.value="";
b.value=temp1+fh;
}
if (condition) {
} else {
}
}
function h(c){ //等号
run();
b.value=temp1+fh+temp2+dh;
k=0;
temp1=0;
temp2=0;
fh="";
dh="=";
fuhao==0;
}
function run() { //运算函数
if (j.value=="") {
temp2=0;
} else {
temp2=j.value;
}
switch (fh) {
case "+":
j.value=parseFloat(temp1)+parseFloat(temp2);
break;
case "-":
j.value=parseFloat(temp1)-parseFloat(temp2);
break;
case "*":
j.value=parseFloat(temp1)*parseFloat(temp2);
break;
case "/":
if (parseFloat(temp2)=="0") { //除数不能为零的判断
j.value="除数不能为零";
} else {
j.value=parseFloat(temp1)/parseFloat(temp2);
}
if (parseFloat(temp1)/parseFloat(temp2)*10000000000000000/1!= 0) {
dh="≈";
}
break;
default: //防止乘号出错
if (fh=="") {
break;
} else {
j.value="运算符出错";
k=0;
temp1=0;
temp2=0;
fh="";
dh="=";
dianhao=0;
break;
}
}
}
</script>
</body>
</html>
标签：简易,value,temp2,temp1,parseFloat,nbsp,计算器,var 来源： https://blog.csdn.net/zgw77477/article/details/120877606