js简单的计算器(使用eval)
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <title></title> <script type="text/javascript"> window.onload = function () { var result = document.getElementById("txtResult"); //获取值得ID var denghao = document.getElementById("txtDenghao"); //获取等号的ID var qingchu = document.getElementById("txtClear"); //给name是shuzi的加上onclick事件 var btnshuziArr = document.getElementsByName("shuzi"); for (var i = 0; i < btnshuziArr.length; i++) { btnshuziArr[i].onclick = function () { result.value += this.value;//this代表你点击时的那个 } } //结果 denghao.onclick = function () { result.value = eval(result.value); } //清除 qingchu.onclick = function () { result.value = ""; } } </script> </head> <body> <table cellpadding="0" cellspacing="0"> <tr> <td colspan="4"> <input id="txtResult" name="result" type="text" value="" /> </td> </tr> <tr> <td colspan="2"> <input id="txtDenghao" name="denghao" type="button" value="=" /> </td> <td colspan="2"> <input id="txtClear" name="clear" value="清除" type="button" /> </td> </tr> <tr> <td> <input name="shuzi" value="7" type="button" /> </td> <td> <input name="shuzi" value="8" type="button" /> </td> <td> <input name="shuzi" value="9" type="button" /> </td> <td> <input name="shuzi" value="/" type="button" /> </td> </tr> <tr> <td> <input name="shuzi" value="4" type="button" /> </td> <td> <input name="shuzi" value="5" type="button" /> </td> <td> <input name="shuzi" value="6" type="button" /> </td> <td> <input name="shuzi" value="*" type="button" /> </td> </tr> <tr> <td> <input name="shuzi" value="1" type="button" /> </td> <td> <input name="shuzi" value="2" type="button" /> </td> <td> <input name="shuzi" value="3" type="button" /> </td> <td> <input name="shuzi" value="-" type="button" /> </td> </tr> <tr> <td colspan="2"> <input name="shuzi" value="0" type="button" /> </td> <td colspan="2"> <input name="shuzi" value="+" type="button" /> </td> </tr> </table> </body> </html>
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