本文實例講述了js實現模擬計算器退格鍵刪除文字效果的方法。分享給大家供大家參考。具體如下：
<!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>無標題文檔</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 class="tf" name="textfield" type="text" id="tf" size="30" /><br /><input class="myinput" type="submit" name="button" id="btn0" value="0" /><input class="myinput" type="submit" name="button" id="btn1" value="1" /><input class="myinput" type="submit" name="button" id="btn2" value="2" /><br /><input class="myinput" type="submit" name="button" id="btn3" value="3" /><input class="myinput" type="submit" name="button" id="btn4" value="4" /><input class="myinput" type="submit" name="button" id="btn5" value="5" /><br /><input class="myinput" type="submit" name="button" id="btn6" value="6" /><input class="myinput" type="submit" name="button" id="btn7" value="7" /><input class="myinput" type="submit" name="button" id="btn8" value="8" /><br /><input class="myinput" type="submit" name="button" id="btn9" value="9" /><input class="myinput" type="submit" name="button" id="btn10" value="." /><input class="myinput" type="submit" name="button" id="back" value="退格" /></body></html>希望本文所述對大家的javascript程序設計有所幫助。
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