一个简单的jQuery计算器，只是实现了一个连续计算的功能
<!DOCTYPE html> <html> <head> <meta charset="utf8"/> <title>Javascript计算器</title> </head> <body> <table> <tr> <td colspan="4"><input id="show" value="0"/></td> </tr> <tr> <td><button onclick="number(this)" value="7">7</button></td> <td><button onclick="number(this)" value="8">8</button></td> <td><button onclick="number(this)" value="9">9</button></td> <td><button onclick="calsym(this)" value="+">+</button></td> </tr> <tr> <td><button onclick="number(this)" value="4">4</button></td> <td><button onclick="number(this)" value="5">5</button></td> <td><button onclick="number(this)" value="6">6</button></td> <td><button onclick="calsym(this)" value="-">-</button></td> </tr> <tr> <td><button onclick="number(this)" value="1">1</button></td> <td><button onclick="number(this)" value="2">2</button></td> <td><button onclick="number(this)" value="3">3</button></td> <td><button onclick="calsym(this)" value="*">*</button></td> </tr> <tr> <td><button onclick="number(this)" value="0">0</button></td> <td><button onclick="calsym(this)" value="=">=</button></td> <td><button onclick="clearCal()" value="c">c</button></td> <td><button onclick="calsym(this)" value="/">/</button></td> </tr> </table> </body> <script type="text/javascript" src="jquery-1.9.1.js"></script> <script type="text/javascript" src="jquery-1.9.1.min.js"></script> <script type="text/javascript"> 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; } </script> </html>新闻热点
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