本文实例讲述了js实现模拟计算器退格键删除文字效果的方法。分享给大家供大家参考。具体如下：
<!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> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>无标题文档</title> <style type="text/css"> .myinput{ width:70px; height:30px; } .tf{ width:220px; height:30px; margin-bottom:5px; font-size:26px; font-family:Tahoma, Geneva, sans-serif; color:#fff; border:2px solid #999; background:#000; text-align:right; } </style> <script language="javascript" type="text/javascript"> window.onload = function() { var tf = $("tf"); for( var i=0;i<11;i++ ){ $("btn"+i).onclick = function(){ if(this.value == "." && tf.value == "") return false; if(this.value == "." && tf.value.indexOf(".") != -1) return false; if(tf.value == "0"){ if(this.value == "."){ tf.value += this.value; } }else{ tf.value += this.value; } } } $("back").onclick = function(){ tf.value = tf.value.replace(/.$/,'') } } function $(id){return document.getElementById(id);} </script> </head> <body> <input name="textfield" type="text" id="tf" size="30" /> <br /> <input type="submit" name="button" id="btn0" value="0" /> <input type="submit" name="button" id="btn1" value="1" /> <input type="submit" name="button" id="btn2" value="2" /> <br /> <input type="submit" name="button" id="btn3" value="3" /> <input type="submit" name="button" id="btn4" value="4" /> <input type="submit" name="button" id="btn5" value="5" /> <br /> <input type="submit" name="button" id="btn6" value="6" /> <input type="submit" name="button" id="btn7" value="7" /> <input type="submit" name="button" id="btn8" value="8" /> <br /> <input type="submit" name="button" id="btn9" value="9" /> <input type="submit" name="button" id="btn10" value="." /> <input type="submit" name="button" id="back" value="退格" /> </body> </html>
希望本文所述对大家的javascript程序设计有所帮助。