本文实例为大家分享了jQuery实现计算器功能的具体代码,供大家参考,具体内容如下
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<!DOCTYPE html>
< html lang = "en" >
< head >
< meta charset = "UTF-8" >
< title >计算器</ title >
< script src = "../jquery.min.js" ></ script >
< style >
*{
margin: 0;
padding: 0;
}
#calculator{
margin: 50px auto;
padding: 5px;
width: 230px;
height: 230px;
background: rgb(190,210,224);
}
#screen{
width: 230px;
height: 60px;
background: rgb(153,153,153);
border-radius: 5px;
text-align: right;
overflow: hidden;
}
#txt1{
height: 20px;
padding-top: 10px;
font-size: 10px;
}
#txt2{
height: 30px;
font-size: 20px;
}
#num{
float:left;
width: 130px;
}
#num input{
width: 40px;
height: 40px;
margin-top: 3px;
}
#operator{
float:right;
width: 70px;
height: 170px;
}
#operator input{
width: 70px;
height: 30px;
margin-top: 4px ;
}
#converter{
float:right;
width: 70px;
height: 170px;
}
</ style >
</ head >
< body >
< div id = "calculator" >
< div id = "screen" >
< p id = "txt1" ></ p >
< p id = "txt2" ></ p >
</ div >
< div id = "workspace" >
< div id = "num" >
< 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 type = "button" value = "C" >
< input type = "button" value = "0" >
< input type = "button" value = "." >
</ div >
< div id = "operator" >
< input type = "button" value = "+" >
< input type = "button" value = "-" >
< input type = "button" value = "*" >
< input type = "button" value = "/" >
< input type = "button" value = "=" >
</ div >
</ div >
</ div >
< script >
$(function(){
var i=0;//i为清空标志,i=1时需要清空#txt2的数据
//获取输入的数字
$("#num input").click(function () {
//先判断#txt2中是否保存着上次计算的结果,如果是则将其清空
if (i===1){
$("#txt2").text("");
}
//保证数字以正确的格式显示
//使用switch语句实现
switch ($(this).val()){
case "C":
$("#txt2").text("");
break;
case ".":
if ($("#txt2").text().indexOf(".") != -1) {
break;
}else{$("#txt2").append($(this).val());}
break;
default:
if ($("#txt2").text() === "0") {
$("#txt2").text($(this).val());
}else{
$("#txt2").append($(this).val());
}
}
//使用if语句实现
/* if ($(this).val()=="C"){
$("#txt2").text(" ");
} else {
if ($("#txt2").text().indexOf(".") != -1) {
if ($(this).val() == ".") {
} else {
$("#txt2").append($(this).val());
}
} else if ($("#txt2").text() === "0") {
if ($(this).val() === ".") {
$("#txt2").append($(this).val());
} else {
$("#txt2").text($(this).val());
}
}else{
$("#txt2").append($(this).val());
}
}*/
i=0;//将清空标志设为0
});
//获取运算符
$("#operator input:not(:last)").click(function () {
$("#txt1").text($("#txt2").text()+$(this).val());
$("#txt2").text("");
});
//按下“=”键进行计算
$("#operator input").last().click(function () {
//使用eval()函数
//$("#txt2").text(eval($("#txt1").text()+$("#txt2").text()));
//使用常规方法
var str=$("#txt1").text();
var n1=parseFloat(str);
var n2=parseFloat($("#txt2").text());
var cal=str[str.length-1];
switch (cal){
case "+":
$("#txt2").text( n1+n2);
break;
case "-":
$("#txt2").text( n1-n2);
break;
case "*":
$("#txt2").text( n1*n2);
break;
case "/":
$("#txt2").text( n1/n2);
break;
default: break;
}
$("#txt1").text( "");
i=1;//将清空标志设为1
});
});
</ script >
</ body >
</ html >
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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服务器之家。
原文链接:https://blog.csdn.net/willard_cui/article/details/81592013