<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title></title> <style type="text/css"> #show { width: 232px; height: 80px; color: white; border-radius: 5px 5px 0 0; background-color: rgba(127, 128, 127, 1); text-align: right; border: none; font-size: 45px; outline: none; } table { border: 1px solid black; border-collapse: collapse; width: 234px; text-align: center; font-size: 30px; } td { height: 55px; width: 57.5px; background-color: wheat; } td:active { background-color: coral; } .aperation { background-color: rgb(245, 146, 62); color: white; } #ape { background-color: wheat; color: #000000; } </style> </head> <body> <div> <input type="" /> <table> <tr> <td>AC</td> <td>+/-</td> <td>%</td> <td>/</td> </tr> <tr> <td>7</td> <td>8</td> <td>9</td> <td>*</td> </tr> <tr> <td>4</td> <td>5</td> <td>6</td> <td>-</td> </tr> <tr> <td>1</td> <td>2</td> <td>3</td> <td>+</td> </tr> <tr> <td colspan="2">0</td> <td>.</td> <td>=</td> </tr> </table> </div> </body> <script type="text/javascript"> //获取数字的集合 var nums = document.getElementsByClassName("num"); //获取操作符的集合 var options = document.getElementsByClassName("aperation"); //获取等号 var result = document.getElementById("result"); //获取归0 var clear = document.getElementById("clear"); //获取展示框 var show = document.getElementById("show"); //声明用于保存内容的三个变量 var numValue = ""; //存储数字 var optionC = ""; //存储操作符 var numTemp = ""; //存储暂存值 //点击数字键时 触发事件 for(var i = 0; i < nums.length; i++) { nums[i].onclick = function() { if(numValue == "0") { numValue = ""; } numValue += this.innerHTML; show.value = numValue; } } //点击操作键触发事件 for(var i = 0; i < options.length - 1; i++) { options[i].onclick = function() { //先存储之前记录的数字 numTemp = numValue; //记录操作符 optionC = this.innerHTML; //清除原有记录的数字 numValue = ""; } } //等号操作 result.onclick = function() { show.value = eval(numTemp + optionC + numValue); } //清零操作 clear.onclick = function() { show.value = "0"; numValue = ""; optionC = ""; numTemp = ""; } </script> </html>
JS键盘版计算器的制作方法
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