ajax实现简单计算器,一个简单的jQuery计算器实现了连续计算功能

Javascript计算器

7	8	9	+
4	5	6	-
1	2	3	*
0	=	c	/

var num0 = null;

var num1 = null;

var symble = null;

var lastclick = null;

var symarr = new Array(); //符号集合

symarr[0] = '+';

symarr[1] = '/';

symarr[2] = '*';

symarr[3] = '-';

symarr[4] = '=';

function number(n){

var numnow = $('#show');

var _exist=$.inArray(lastclick,symarr); //判断上次点击是否为符号

if (numnow.val() == 0 || _exist != -1) {//若显示框为0 或者上次点击为符号，则重新记录显示框

numnow.val($(n).val());

}else{

numnow.val(parseInt(numnow.val()) * 10 +parseInt($(n).val()));

}

lastclick = $(n).val(); // 更新上次点击

}

function calsym(cs){ //符号点击事件响应

var numnow = $('#show');

var _exist=$.inArray(lastclick,symarr);

if (num0 == null && symble == null) { //初始状态

num0 = numnow.val();

symble = $(cs).val();

}else if(num0 != null && num1 == null && _exist !=-1){ // 连续点操作符的处理，及第一次点击操作符处理

symble = $(cs).val();

}else{ //正常计算状态

num1 = numnow.val();

var result = calculate(symble,num0,num1);

symble = $(cs).val(); //上行及本行：先计算之前的运算符及结果，再更新运算符为本次点击

num0 = result;

numnow.val(result);

num1 = null;

}

lastclick = $(cs).val(); // 更新上次点击

}

function clearCal(){ //清空函数

$('#show').val('0');

num0 = null;

num1 = null;

symble = null;

lastclick = null;

}

function calculate(sym,m,n){ //计算并返回结果

var res = null;

m = parseInt(m);

n = parseInt(n);

switch(sym){

case '+':

res = m+n;

break;

case '-':

res = m-n;

break;

case '*':

res = m*n;

break;

case '/':

if (n == 0) {

alert("false");

break;

}

res = m/n;

break;

default:

break;

}

return res;

}