最近编写的一个简单的计算器代码程序，先给大家展示一下

分享代码如下

#box{width: 295px; margin: 0 auto; text-align: justify; border: 1px solid #ddd; padding: 15px;}

.d_num{display: inline-block; margin: 10px; width: 33px; height: 30px; border: 1px solid #ddd; text-align: center; line-height: 30px; cursor: pointer;}

.sum{margin: 0 10px 10px; line-height: 30px; font-size: 20px;}

#sum{width: 205px; height: 30px; padding: 0 5px; margin-left: 5px; font-size: 20px;}

#process{width: 255px; height: 30px; padding: 0 5px; margin-left: 5px; font-size: 20px;}

var $box = document.getElementById('box');

var $sum = document.getElementById('sum');

var $process = document.getElementById('process');

var sum = 0, process = '', num1 = '', num2 = '', temp = '', statu = false;

$box.onclick = function(e){

var event = window.event || e;

var ele = event.srcElement || event.target;

var _className = ele.className;

if(_className == 'd_num'){

var num = ele.getAttribute('data-num');//点击的按钮对应的值

var NotNum = isNaN(num);

if(!NotNum || num == '.'){ //点击了数字

if(!statu){ //还没点击过符号

if(num1 == '0'){

num1 = '';

}

num1 += num;

process = num1;

}else{ //已经点击过符号

if(num2 == '0'){

num2 = '';

}

num2 += num;

process = num1 + temp + num2;

}

$process.value = process;

}

else{ //点击了符号

if(num1 == ''){//非法操作

return false;

}

if(num == 'C'){//归零

num1 = '';

num2 = '';

process = '';

temp = '';

sum = '';

$process.value = '0';

$sum.value = '0';

statu = false;

return false;

}

if(num == '

if(sum != ''){

return false;

}

if(num2 == ''){

; num1 = num1.substring(0,num1.length-1);

if(num1 == ''){

num1 = '0';

}

process = num1;

$process.value = process;

}else{

num2 = num2.substring(0,num2.length-1);

if(num2 == ''){

num2 = '0';

}

process = num1 + temp + num2;

$process.value = process;

}

return false;

}

if(num2 != ''){//a&b

if(num == '='){//元操作到此结束

$process.value = process;

}else{

$process.value = process + num;

}

switch(temp){//元操作继续

case '+' : sum = parseFloat(num1) + parseFloat(num2); $sum.value = sum; $process.value = process; num1 = sum + ''; num2 = ''; break;

case '-' : sum = parseFloat(num1) - parseFloat(num2); $sum.value = sum; $process.value = process; num1 = sum + ''; num2 = ''; break;

case '*' : sum = parseFloat(num1) * parseFloat(num2); $sum.value = sum; $process.value = process; num1 = sum + ''; num2 = ''; break;

case '/' : sum = parseFloat(num1) / parseFloat(num2); $sum.value = sum; $process.value = process; num1 = sum + ''; num2 = ''; break;

case '%' : sum = parseFloat(num1) % parseFloat(num2); $sum.value = sum; $process.value = process; num1 = sum + ''; num2 = ''; break;

}

}else{//a&？

if(num == '='){

return false;

}

$process.value = process + num;

process = '';

}

if(num == '='){

sum = '';

statu = false;

return false;

}

temp = num;//记录操作符

statu = true;//已经触发操作状态

}

}

};