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js實現模擬計算器退格鍵刪除文字效果的方法
這篇文章主要介紹了js實現模擬計算器退格鍵刪除文字效果的方法,涉及javascript字符串截取操作的相關技巧,需要的朋友可以參考下
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 <!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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